Re: SSH authentication bypass?
Tom Buskey writes: There was a neat article in Linux Journal (?) that compared compression/decompression time, bandwidth, data compressibility and cpu speed. Thank you very much for the very interesting article. Back when I was playing around with the HPN SSH, I was sort-of guessing that HPN SSH would improve my scp performance by making improvements in the area of buffer-management and flow-control. I thought this was the most likely place where things could be improved. (I thought this was a reasonable guess, since I was copying files across an entire continent) Unfortunately, my initial results weren't really any different from unpatched-SSH. Soon afterwards I migrated to a new project where I didn't need to use scp nearly as much, so I didn't get to play around with this much more . I would have found it interesting to muck around in this area a bit more. Ah, well... The only point I'm trying to make here is that these patches are very interesting, but they might not be a silver bullet... Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: SSH authentication bypass?
Mark Komarinski writes:
HPN SSH (patches to boost ssh performance) allows for no encryption
of the data stream but IIRC the authentication is encrypted. That
doesn't bypass authentication so this may not be related
The following statement is based on my experience with these patches:
I didn't notice much of a difference from these patches when I was
copying a certain {large-ish, constantly updating} file from a site on
the West Coast to a site in NH.
I probably had around 100 samples in my data-set, and I just didn't
see a difference. All of these samples related to scp operations
that were occurring over the public Internet. I tried as much as
possible to perform my experiments during times of the day in which
the network was quiet (but this was/is a crapshoot on the general
Internet, of course).
I had high-hopes for these patchesspecifically the parts of the
patches that did things with increasing buffer sizes. If I could have
gotten this particular file to arrive in NH a bit faster this would
have made my work a bit easier.
Like I said, this is just my experience with these patches.
Regards,
--kevin
--
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Re: Sniffing gigabit ethernet? 1000baseT LAN taps?
Joshua Judson Rosen writes: Michael ODonnell writes: I don't know what your situation is but if there's a managed switch involved I believe that some of them can be rigged to echo traffic to one or more specified ports for analysis/debug. Mm. Good point. I don't think I have any managed switches on-hand; any recommendations as to what I should get, if I go that route? The feature you'd want here is commonly called port mirroring or port spanning. More info here: http://wiki.wireshark.org/CaptureSetup/Ethernet I do have a small word of advice: it is generally useful when capturing traffic for analysis to come up with some sort of capture filter that limits the amount of traffic that you're going to end up with. On a really busy link, this can make it a lot easier to analyze the traffic at a later time. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Max Wi-Fi connections question
Ed lawson writes:
I'm sure someone in the group has a real world answer to this
question. My local school is seeking to have Wi-Fi in every classroom
with each classroom having up to 30 devices using the network
simultaneously. I questioned this and was told the appropriate
commercial grade router is capable of maintaining simultaneous
connections with 120 devices and throughput is fine. This sounds a bit
optimistic to me, but I'm older than gray hair and hardware was never
something I knew much about.
In my ${dayjob} I regularly deal with educational institutions in
which there is a wireless network that serves thousands of
simultaneous wireless clients. I can assure you that the traffic load
on these networks is fairly large and chaotic. End-users at these
sites are generally getting what they need from the network, with few
problems.
So, yes, this is certainly possible, with the right gear and
configuration.
Regards,
--kevin
--
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Re: Fifo buffer question
Curt Howland writes: I have a background process running from which I would like, from time to time, to check the console output. I do not want to dedicate a console window to it, and since I start it from a script the console output is usually just lost to the akashic ethers. [...] Suggestions? Given your description here, I'm not really sure if you really even care about every single line of output from this background process. I just get the idea you want to check up on it every once in a while. Sogiven thisyou could just run your program under screen. After you've started running the program, detach from the screen. It will continue to run. Later on you can reattach with screen -r. Etc. ... Sometimes I leave long-running compute jobs running under screen. Start them in one physical location. Later, in some other location, I re-attach and look at my output. Hope this helps, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: high school python classes
Lloyd Kvam writes: * Public Key Encryption I took a class at UNH when I was a high-school senior (wooly mammoths were still wandering around campus back then...). It was a class with a topic of number theory. I liked all of the math proofs in the class -- very cool stuff. I really wasn't prepared for the class but I did the best that I could. As I sat in these classes on Saturday mornings, it did occur to me that a lot of this stuff was pretty dry. I couldn't see the point of the mathematical excercises that we were going through (why on Earth do I care if two numbers are 'relatively prime'?, I mused). I couldn't fathom how any of this stuff could be used in the Real World. Everything that I thought about these Saturday morning classes changed during the last class. We had a guest lecturer that day -- a professor named David Burton. He came into the classroom with a twinkle in his eye and told us that he was going to teach us some interesting things that morning. In the next two hours he taught us the basics of symmetric key cryptography, and then he moved onto DH key-exchange and public-key crypto. He built on all of the concepts that we had learned in previous classes. I took notes like crazy that morning -- this really was some interesting stuff that this Professor Burton was teaching us. Wow Anyways, I look back upon that morning (eons ago) pretty fondly. One of the things that I do as a software engineer is to design and implement secure systems and protocols. I still use the knowledge that I gained on that Saturday morning as a high-school senior pretty frequently. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: high school python classes
maddog wrote: The class should always start with this is why you use this and why you will want to know it. I do think that you're right about this. However, (1) the class was free (no cost to me) and (2) at the time I was just some guy who didn't know anything about anything [1]. I can't fault them for anything in this course. I learned a lot of interesting things. I am very appreciative. Kind regards, -kevin [1] How little some things change... -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Permissions on /tmp
Joshua Judson Rosen writes: Not that I'm objecting, but more for my own edification: are there actually systems out there that don't set the sticky bit on /tmp? That just seems... insane I can't recall a standard, multi-user Unix-flavored system on which /tmp didn't have the sticky-bit set. I can even *specificially* remember this being true in my undergraduate days. A multi-user system without the sticky-bit set on /tmp isat the very leastmis-configured. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: How can I detect whether an /etc/rc.d/init.d script is being run at boot time versus by hand?
Bill Freeman writes:
I'm trying to figure out whether to force the removal of an almost
certainly stale pid file or not in the service start case.
I'm not specifically answering your question here, but, here is some
code that I believe to be reasonable and related to the problem you
appear to be trying to solve.
Regards,
--kevin
#!/bin/bash
#
# General functions
#
function try_lock () {
local tempfile=$1.$$
local lockfile=$1.lock
# do we have permission at all to write here?
if ! echo $$ $tempfile ; then
echo You do not have permission to access `dirname $tempfile` 12
return 1
fi
# attempt to create the lockfile ; if successful return success
if ln $tempfile $lockfile 2/dev/null ; then
rm -f $tempfile
return 0
fi
# no success creating lockfile? well, is there any current process
# that is holding onto this lock? if so, return (and thus: wait)
if kill -0 `cat $lockfile` 2/dev/null ; then
rm -f $tempfile
return 1
fi
# if we are here the lockfile must be stale
echo Removing stale lock file: $lockfile
rm -f $lockfile
if ln $tempfile $lockfile 2/dev/null ; then
rm -f $tempfile
return 0
fi
rm -f $tempfile
return 1
}
release_lock() {
local lockfile=$1.lock
local tempfile=$1
rm -f $lockfile $tempfile
}
function get_lock() {
local tempfile=$1
until try_lock $tempfile ; do
echo waiting for the lock
sleep 1
done
}
#
# Convenience functions for specific locks
#
function get_AAA_lock() {
get_lock /var/run/AAA
}
function release_AAA_lock() {
release_lock /var/run/AAA
}
function get_BBB_lock() {
get_lock /some/other/path/BBB
}
function release_BBB_lock() {
release_lock /some/other/path/BBB
}
..
function do_something() {
get_BBB_lock
critical_section
release_BBB_lock
}
--
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Re: engineering/geek tours/vacation/sightseeing
David Rysdam writes: There used to be a site out there that was like geektours.com or engineeringvacations.com or something like that. It had computer history and science museums, civil engineering projects, factory tours and all kinds of great stuff listed on it. Does anyone else remember this thing and know where it is? Maybe it died. (In case you find it, this isn't it, although it isn't a terrible addition to the genre: http://engineeringsights.org/) I don't think this is specifically what you were looking for, but since I happened across it in the last 24 hours I thought I'd point it out: _The Geek Atlas: 128 Places Where Science and Technology Come Alive_ John Graham-Cumming Kind regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Printer recommendations
David Tina Ohlemacher writes: The Dell one comes with onsite service and individual toner carts. Looks good... Until I looked for a PPD. Yes the generic PPD will likely work to print, but the right PPD will make it work much better (toner levels, color, meaningful errors, scanning I hope). [] Since I mostly use Debian based distros and do not want to bother trying to convert one to a deb.dell is out. [...but then later you write...] Samsung has a universal printer driverhttp://www.samsung.com/us/business/printers/CLX-4195FW/XAC-support#and inside its gz file I found the PPD file. Simple! You could always try to extract the PPD file (if it exists inside) from the dell.rpm file thusly: rpm2cpio dell.rpm dell.cpio cpio -idv dell.cpio (I have no specific information about any of these printers) Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Another posix file system question
Bill Freeman writes: Scenario, Apache or nginx is serving a file, in response to an AJAX request, because serving static files is fast. The file contains data to be displayed on a web page (via jQueryUI bar graphs, among, if that's of interest). While I might come up with a scheme for updating file contents in place (open for writing,don't truncate, seek, write), I would feel less as hazard if I wrote a new file and swapped it in under the the same directory entry. (Hopefully, if the server tends to cache static files in memory, it at least does a stat on the file name at each request, to see if the modification time has changed.) The plan is to create a new file under a different name, then hard link the critical name to the new file. I know that I can use 'ln -f' on the command line, but I don't know whether that turns into an unlink followed by a link, leaving a tiny window during which the critical name doesn't exist, or whether (other than updating link counts) this just does the equivalent of writing a new inode number into the directory entry. This plan isn't going to work, because the call to link() is going to fail with EEXIST. Instead of using link(), you should use rename(), which has all of the atomic semantics that you seem to be looking for. Think of this as being like double-buffering, on your fs. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: IPMI security article
Lloyd Kvam writes: Should I simply disable IPMI or is it likely to be useful even in my circumstances? Do you have any need to manage your server remotely using the functionality that IPMI provides? How easy is it for you to physically access your server? I've been giving IPMI some thought lately as well. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Linux-centric curricula in New England?
Matt Minuti writes: I believe UNH's CS department was quite linux-centric. The first programming course for engineers was C++ using GCC and VI, and required ssh'ing into a server to submit work. That's about all I can speak to, though. That said, I think they've switched over to Java for a lot of the beginning stuff a few years back, so none of what I said might be true anymore. I'd agree with this view as well, although I haven't really interacted with the department too much in the last few years. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Two things: anti-spam and per-process *network* I/O.
Ken D'Ambrosio writes: Per-process I/O accounting. Every now and then, I see a system load spike through the roof -- but disk I/O is okay, likewise CPU. Which really pretty much leaves network. But I'm unaware of any tool that spits out per-process network utilization statistics. One *must* exist, right? Any pointers? So, to confirm, when these incidents occur, the load average on the machine is low? I'd suggest using ntop and if things aren't clear from just this, using some combination of lsof -i ... or netstat -p. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: sched_setscheduler(2)
Can you send us the kernel .config that goes along with the kernel that you are running on your target machine? Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: sched_setscheduler(2)
Bruce Dawson writes: Does anyone have any experience with this system call? Can you give us some code with your exact setup for sched_setscheduler()? Using this call requires a bit of setup ; there are a quite a few things that could go wrong or not be setup correctly, etc. Being able to look at a snippet of your code would be very helpful. Also, could you run the snippet of code on your target machine and provide us with the strace output? Kind regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: sched_setscheduler(2)
Strange. I made a few minor changes (see attached patch)
and when I run your code on my test machine running Linux kernel
2.6.35 I get the following output:
$ sudo ./latencytest
./latencytest starting...
My original scheduling policy is SCHED_OTHER (0)
The original minimum scheduling priority is 0, the maximum is 0
sched_get_priority_max(1) returned 99
sched_get_priority_min(1) returned 1
My target scheduling policy is SCHED_FIFO (1)
The target minimum scheduling priority is 1, the maximum is 99
params.sched_priority now set to 98
It worked - now running in high-priority mode
params.sched_priority now set to 98
Now running at original scheduler policy
My scheduling policy is SCHED_OTHER
The minimum scheduling priority is 0, the maximum is 0
$
We'll have to look deeper. Of course, the first thing that comes to
mind is that you are running a 3.x kernel, and I am not (yet).
Regards,
--kevin
--
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GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E
And the Army Ants, they leave nothin' but the bones...
-- Tom Waits
--- latencytest.c.orig 2012-11-08 17:27:56.868748156 -0500
+++ latencytest.c 2012-11-08 17:21:19.941866904 -0500
@@ -43,7 +43,8 @@
return buf;
}
-main(int argc, char ** argv) {
+
+int main(int argc, char ** argv) {
int origpolicy; /* Current process' scheduling
priority */
int origPolicyMaxPriority; /* Maximum priority for the original
@@ -71,7 +72,7 @@
strerror(errno));
};
if ((origPolicyMinPriority = sched_get_priority_min(origpolicy)) 0) {
-fprintf(stderr, sched_get_priority_min(%d) failed, origpolicy,
+fprintf(stderr, sched_get_priority_min(%d) failed: %s, origpolicy,
strerror(errno));
};
printf(My original scheduling policy is %s\n, PolicyToStr(origpolicy));
@@ -140,6 +141,7 @@
/* ... */
/* Return to normal priority. */
+params.sched_priority = 0; /* assumes orig schedule was SCHED_OTHER */
retval = sched_setscheduler (pid, origpolicy, params);
if (retval 0) {
fprintf(stderr, sched_setscheduler (%d, %d, ...) failed: %s\nQuiting.\n,
@@ -181,11 +183,13 @@
strerror(errno));
};
if ((origPolicyMinPriority = sched_get_priority_min(origpolicy)) 0) {
-fprintf(stderr, sched_get_priority_min(%d) failed, origpolicy,
+fprintf(stderr, sched_get_priority_min(%d) failed: %s, origpolicy,
strerror(errno));
};
printf (The minimum scheduling priority is %d, the maximum is %d\n,
origPolicyMinPriority, origPolicyMaxPriority);
+
+ return EXIT_SUCCESS;
}
/**
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Re: grub issue
michael miller writes: I was happy with ubuntu 10.04, but built a new computer (intel i5, msi mb) and was having trouble finding drivers for some of the hardware so I upgraded to 12.04. Everything works fine, except that frequently it boots to a command line instead of the gui. One to three reboots later it's back to normal. I thought it would be a grub issue but haven't changed anything since the original install and particularly don't understand why the problem is intermittent. Any suggestions where I should look? When the box boots up in a non-graphical mode: 1: what is the output of runlevel? 2: are there any relevant logfiles out in /var/log that related to the X server? Can you show us these? On my system these appear in a file with a named like /var/log/Xorg.0.log (but I'm not currently running Ubuntu). 3: is there any relevant stuff in /var/log/messages ? 4: what happens when you type telinit 5? Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: grub issue
Ben Scott writes: On Tue, Oct 23, 2012 at 10:54 AM, Kevin D. Clark wrote: 4: what happens when you type telinit 5? FYI, Debian and (IIRC) Ubuntu don't use runlevel 5 normally. They normally boot to runlevel 2, and use a service to start/stop an X display manager. So, I think the equivalent command would be: /etc/init.d/gdm start I could be wrong, this is from memory, and I haven't used Ubuntu in a while, either. IIRC, Ubuntu replaced the standard SysV init with some new thing, and it may not even have initscripts anymore. Yeah, I sort-of knew this. I probably should have booted up one of my Ubuntu VMs before I sent this. Regardless, we all got the debug process moving along (-: --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Capturing file descriptor 3, or alternatives.
I've thought about this problem during my commute for a week now, and I haven't been able to come up with a simple solution that satisfies the constraints. I think that a lot of effort could be put into solving this problem with these constraints...or...the problem could be solved simply with a small temporary file that parent+child agreed to use. A robust, simple implementation could probably be put together in no more than 10 minutes. I'm a big fan of simple. Just my humble opinion, --kevin PS It seems to me that the fundamental problem here is that the shell gives the programmer easy ways to setup unnamed pipes in standardized sorts of ways, but once you want to do something outside these standardized patterns, the shell's design tends to force you to actually name these pipes/etc -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: I'm considering a new laptop, looking for experiences.
Bill Freeman writes: Can anyone offer personal experience stories on the Dell Inspirons? I've got a Dell Inspirion 1525 that I paid $400 for at the Dell refurbished outlet (online). The machine is 3-4 years old at this point. I use it for a couple of hours most days. It's a $400 laptop. It is cheap, but it does what I need it to do. I've run Ubuntu on the system but I mostly run Fedora. In terms of hardware, the touchpad can be a little bit sensitive but I have gotten used to it. The actual material that the laptop is constructed from is cheap plastic and it has in fact developed a small crack near where the power cord plugs into the laptop. It is for this reason that I would say that this wouldn't be a great laptop to actually lug around on a regular basis -- this laptop wouldn't withstand the physical wear and tear. The screen itself is glossy ; I wish it was matte but I rarely use this thing in situations with lots of glare. In related news, I note that Woot is selling some Lenovo Thinkpad today. Hope this helps, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: EMACS - enabling at spi2 support
Susan Cragin writes: New problem: What's the best way to learn lisp? Anyone have a favorite book or on-line site? I always thought that _The Little Lisper_ was pretty good. Unfortunately, this book is out of print. However, it has been replaced with a Scheme variant, and this might not be a bad read. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: EMACS - enabling at spi2 support
Susan Cragin writes: Does anyone know how to enable at-spi2 support in emacs? Obviously, I think that you are smart enough to find atspi.el here: http://delysid.org/atspi.el ...and of course the comments in the elisp code list some dependencies. After you'll pulled down everything and installed the dependencies, you might try typing something like: M-x load-file /some/path/to/atspi.el Later on you might try adding something like: (require 'atspi) ...to your .emacs file. I have no experience with atspi or at-spi2, unfortunately. I do hope this helps! Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Accessing partitions in drive images
Jerry Feldman writes: I agree. I don't think my Apple ][ floppies were partitioned. Back in the day there were a plethora of floppies. You had 8 in., 5 in. There were a number of Word Processors in the 70s that used floppies. The PC changed the landscape for both floppies and HDs, and also other removable media. plug for silly web-page Kevin's Elephant Memory Systems Tribute Page http://home.comcast.net/~kevin_d_clark/ems/ /plug for silly web-page Never forget, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Yum errors
M D L writes: Attempting to update Fedora 15 I've been having errors: ERROR with rpm_check_debug vs depsolve: libibus-1.0.so.0()(64bit) is needed by eekboard-1.0.5-1.fc15.x86_64 libibus-1.0.so.0()(64bit) is needed by ibus-hangul-1.4.0-1.fc15.x86_64 Please report this error in http://yum.baseurl.org/report What happens when you RPM-uninstall libibus, eekboard, and ibus-hangul and then try to re-install these RPMs right after this? Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: mint
My solution was to flip gnome 3 the bird and switch to XFCE. Me, too - I switched to the XFCE-based Xubuntu. I couldn't figure out Gnome3 when I upgraded to Fedora 16. It just threw me for a loop. I tried out LXDE and then I found that XFCE suited me better. YMMV. --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: GNOME 3 (was: mint)
Joshua Judson Rosen writes: It's funny what non-hackers notice and appreciate :) The feature that I *cannot* live without is virtual desktops. I prefer to have 16 or 25 of them, in a 4x4 or 5x5 format. I logically separate my work onto these desktops, and I navigate between these with my keyboard. After an hour of futzing with LXDE I couldn't get my 4x4 format, so I checked out XFCE. I'll say one really nice thing about LXDE: if you want to change the format of the displayed time in the date/time applet, the docs say use the format described in strftime(). Wow, that's minimal, and that's awesome too. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E And the Army Ants, they leave nothin' but the bones... -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Conversations w/ Computing's historical personages (was: Historical origin of cron's day-of-month/weekday behavior?)
Joshua Judson Rosen writes: This has always been one of my favourite things about the unix world-- and, to some extent, computing in general: that the founders are still around, and many of them even *respond to e-mail*. The analogies for other domains are things like `exchanging post-cards with Thomas Jefferson or Florence Nightingale'. I agree with this sentiment as well. A long time ago I sent email to the late, great W. Richard Stevens, and *he responded*. I was totally blown away by this. I never expected a reply. I went on to pretty much immerse myself in his books, and, in terms of technical things to do, there are few better things in this world to play around with the stuff that Rich Stevens presented in his books. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Dennis Ritchie, Creator of UNIX and C, Dead at 70
We have lost a giant in our industry -- truly a great man. He will be missed. --kevin -- Believe me on this. The free cocaine was nowhere in evidence, I consumed no cigar-sized hash bombers, the insistent, complaisant lovelies were elsewhere by the time I got back from dinner. Indeed, the plaster of Paris I had obtained in case anyone wanted a cast of my genitals went entirely unused. -- dmr ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: [OT] Adding recruiters to LinkedIn connection list?
Michael ODonnell writes: It seems likely that there is (possibly substantial!) value to a recruiter in being able to see my connections, but is there value (or harm) to me? There is a setting in LinkedIn called Select who can see your connections. One of the reasons why I have set this to only me is exactly for the reason that you cite. (I look at a site like LinkedIn and think to myself gosh, this is a recruiter's dream!) So, if I am connected to some recruiter on LinkedIn, I generally understand that the only connections they can see on my LinkedIn page are the people who I have recommended or who have recommended me. (I hope this is also true for people who hold premium LinkedIn accounts, but I am unsure of this particular aspect of LinkedIn's site.) ... I'm connected to some recruiters on LinkedIn ; I'm pretty much at the point of concluding that 80% of these recruiter contacts represent little upside for me. I might do something about this soon... Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Helios Project Director Felled By Stroke; Linux Community Support Sought
http://broadcast.oreilly.com/2011/06/helios-project-director-felled.html ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: rc script running twice ???
Drew Van Zandt writes: /etc/rc2.d/S40init_xuarts start root 498 0.0 0.8 2808 504 ttyS0S+ 00:00 0:00 \_ /bin/sh /etc/rc2.d/S40init_xuarts start root 500 0.1 0.9 1676 576 ttyS0S+ 00:00 0:00 \_ sed s/ttyname=// . # Barcode ln -s -f `/usr/local/bin/xuartctl -d --speed=115200 --mode=7e1 -p 1 21 |sed s/ttyname=//` /dev/barcode # Copleys ln -s -f `/usr/local/bin/xuartctl -d --speed=9600 --mode=8n1 -p 2 21 |sed s/ttyname=//` /dev/copley # Watlows ln -s -f `/usr/local/bin/xuartctl -d --speed=38400 --mode=8n1 -p 5 21 |sed s/ttyname=//` /dev/watlow I think that your multiple S40init_xuarts entries in the process table are a result of the subshells that you are running via `backticks`. This is the behavior of the shell. Furthermore, since you are apparently seeing something hang here, I'll bet that one of your invocations of /usr/local/bin/xuartctl is hanging somehow. If it wasn't hanging, then you'd have a very difficult time seeing this in the process table. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Novell agrees to be acquired by Attachmate.
Ryan Lee Stanyan writes: I barely trust people to drive in two dimensions, let alone three! My commute takes me a little while, so I have to drive in four. A physicist that I listened to one even speculated that it was even more complicated than this, but my car does not look like a police box (maybe next year's model) and so my commute remains rather mundane (with short bursts of white knuckled driving on occasion, of course). Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Well, he came home from the war with a party in his head And a modified Brougham DeVille -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Looking for MySQL teaching materials for High School students
Dan Coutu writes: My local high school's tech center is looking for learning materials (e.g. books) that will help students to understand the basics of how to use MySQL. Ideally some discussion of database normalization and how to design a database schema for an application would also be found is these materials. Does anybody have pointers to such things? I think that the O'Reilly book _Learning SQL_ by Alan Beaulieu is pretty good. Hope this helps, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Don't get caught up in the hype - the Zen of The Unix Philosophy
Lloyd Kvam writes: I do agree with his basic point. Use the system tools to glue your processing into a series of simple steps. Shell scripts are very powerful. I don't take anybody seriously who thinks otherwise. I wrote a shell script once that automated an extremely tedious (took days/weeks to complete) task. It took me one single caffeine-induced night of hacking to put together this script. My boss later told me that he estimated that this shell script saved the company well over a half-a-million dollars. Later, after my night of feverish shell-script hacking, I rewrote the script in Perl (because 3000-line shell scripts are hard to grok...) and I did lots of other cool stuff with this new version of the script. If I hadn't been able to easily prototype this thing in terms of a shell script, it would have taken me a long, long time to get it done...if ever... --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: cable modem requires reboot because one site falls off DNS?
Greg Rundlett writes: I have a strange problem where one (and only one as far as we know) particular website becomes inaccessible to our office. So, you are telling us that the site becomes inaccessible in the sense that it seems to fall out of the DNS? Any ideas on what could cause this and how to troubleshoot? When you know you are experiencing this problem, it might be useful to run these commands and provide us with the output: dig @68.87.71.226 nnerenmls.com A nnerenmls.com SOA dig @8.8.8.8 nnerenmls.com A nnerenmls.com SOA If might be good to save the output of these too at a point in time when you know that everything seems to be working too. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Quarantining an account from the Internet, or from all networking?
Suggestion: suppose you have setup your system with a uid that is protected by some iptables rules (call this UNTRUSTED), and futhermore also suppose that the binary that you really want to protect against is called DOCREADER. Well, then, you might want to consider replacing every occurence of the DOCREADER binary on your system's disk with a script that basically does this: #!/bin/sh exec sudo -u UNTRUSTED DOCREADER-original $...@} You might also want to consider locking this package down from a package-management-automatic-updates perspective. --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Quarantining an account from the Internet, or from all networking?
Benjamin Scott writes: On Tue, Aug 17, 2010 at 8:43 AM, Kevin D. Clark Well, then, you might want to consider replacing every occurence of the DOCREADER binary on your system's disk with a script that basically does this: #!/bin/sh exec sudo -u UNTRUSTED DOCREADER-original $...@} Just occurred to me: Couldn't you setgid the binary, and make the binary owned by root, group untrusted or whatever, mode 755. Right? That's a better suggestion than mine. Another way to do all of this would be through a SELinux config. I have played with this on occasion, but haven't had as much time as I would like to explore here. It seems to me that this could be a more fine-grained solution. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Persistent connection to named pipe
Michael ODonnell writes: I'm now working with a cantankerous old app that can't easily be modified and it'd be handy to have multiple sequential invocations of that app each spew some logging data into a FIFO (without blocking) so it could be processed by a single persistent instance of a filter connected to the output of that FIFO. I'm therefore about to dredge up my little utility and put it back into service in this situation but before I do I wonder if anybody knows of something that's part of the standard Gnu/Linux stuff that already solves this problem. (dd's noerror option didn't do what you wanted here) How about: (while true ; do cat ; done ) /tmp/FIFO Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Spike in SSH attacks
Ted Roche writes: Oh, a reminder: a fellow GNHLUGer told a tale not too long ago about testing ssh changes: always keep an exiting connection open when you're making changes. This way, when you lock yourself out of making new connections with the changes, you can use your old connection to reverse the changes. A good lesson learned. By someone else! I usually test out sshd/firewall changes by employing the following two schemes: 1: as a quick test, I run sshd -e -d -p 1234, where 1234 is the number of some temporary, unused port. Then I ssh -p 1234 from some other machine to test the config changes. 2: when I test out firewall (iptables) rules, I generally check once, check again, and then I test by typing this: /etc/init.d/iptables restart ; sleep 600 ; /etc/init.d/iptables stop During the five minutes that my new rules are in effect, I test. However, in the event that something goes haywire, I know that in five minutes I will have access again. Seriously, by combining these two practices, I have kept myself out of some very tough situations Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Recommendations...
Gerry Hull writes: What are your thoughts/recommendations? Fedora 12 (x86_64) works fine for me on both a laptop and a desktop. I installed Sun's Java, the flash plugin (although I don't usually let that run) and VirtualBox (I have to virtualize some 64-bit OS's). Everything works pretty well for me. I haven't tried Fedora 13 yet. Maybe in a few weeks. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Backing up a little - Trying to get LAPACK to work...
How are you invoking Valgrind? Where is the Valgrind output for the 9x9 run? --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Shot in the dark: Anyone ever use CLAPACK routines?
Bruce Labitt writes:
If anyone has a few spare moments, I'd appreciate a quick look and any
helpful comments you may have. FWIW, I used valgrind and saw that even
when I got the correct answer, there were tons of warnings and errors
reported. (These errors were DEEP inside of the CLAPACK library.)
All of your code allocates space for your matrix arrays on the stack.
There is nothing wrong with this {per se}, but Valgrind is a heap
analysis tool. The stack is not the heap. If you want to use
Valgrind to gain some confidence that the matricies/arrays that you
are using are not being accessed incorrectly, then you will have to
allocate space for your arrays/matricies on the *heap*.
--kevin
--
alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/
GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E
Wipe him down with gasoline 'til his arms are hard and mean
From now on boys this iron boat's your home
So heave away, boys.
-- Tom Waits
___
gnhlug-discuss mailing list
gnhlug-discuss@mail.gnhlug.org
http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Shot in the dark: Anyone ever use CLAPACK routines?
[please don't top-post] Bruce Labitt writes: Is there an equivalent tool for the stack? I don't know of a reliable one. --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Shot in the dark: Anyone ever use CLAPACK routines?
Jerry Feldman writes: On 05/19/2010 03:22 PM, Bruce Labitt wrote: Is there an equivalent tool for the stack? Purify. Purify is a commercial product (expensive too) that instruments every load and store operation whether that be on the heap or the stack. While valgrind is a great tool, it does not compare to Purify. Unless Purify has improved a lot since the last time I used it (five years ago, I admit), then Valgrind is just as good as Purify in my book. In particular, at the time that I used it, Purify claimed to support this sort of checking for stack-based objects, but I never saw it work. Come to think of it, I have seen Insure++ work pretty well for this. --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Shot in the dark: Anyone ever use CLAPACK routines?
Jerry Feldman writes: Several years ago, someone at a BLU meeting mentioned he was having a problem with some code in a phone switch, and his company and Verizon were pointing fingers, especially because a previous problem was theirs. He tried a number of different solutions, and after trying Purify, his company paid then $10,000 for a license. I'm not trying to sell Purify for IBM, but I certainly know how it works. Looks like Insure++ does a similar type of analysis that Purify does. You and I have bantered back and forth about Purify over the years. To be honest, when I was working on telco-class equipment, I was happy to have both Valgrind and Purify for my daily work. Both are excellent tools. I found bugs with Purify that I didn't find with Valgrind, and vice-versa. I'm a big fan of tools like this. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: du(1) for FTP sites
Benjamin Scott writes: Kevin's wget-based implementation worked (thanks again, Kevin!), but was slow due to repeated invocations of wget. Yeah, the big design principal behind my implementation was that I was trying to get it done in less than ~30 minutes...before I had to get going home. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: du(1) for FTP sites
Benjamin Scott writes:
I'm looking for something like du(1), except taking an FTP site
instead of a local directory path. Trying to scope out disk usage on
an FTP site I don't have shell access to.
Non-GUI strongly preferred, but I'll take what I can get.
[attached] gives a big skeleton of what you are looking for. The code
itself could definitely be improved.
I tested this with two FTP servers, but I know for a fact that the
number of variations here is huge.
Enjoy!
--kevin
--
alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/
GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E
Wipe him down with gasoline 'til his arms are hard and mean
From now on boys this iron boat's your home
So heave away, boys.
-- Tom Waits
#!/usr/bin/perl
# author: kevin d. clark (alumni.unh.edu!kdc)
use warnings;
use strict;
use Getopt::Long;
use IO::File;
# given a ftp URL for a directory, this function determines how much
# disk space this directory (and all sub-directories) use
sub get_disk_space($$$) {
my ($url, $user_args, $password_args) = @_;
my $total = 0;
my @dirs;
my $wget_cmd = wget $user_args $password_args --quiet -O /dev/null
--no-remove-listing --waitretry=10 --retry-connrefused '$url';
system($wget_cmd) die some problem with wget: here was the
command\n\n$wget_cmd\n\nexit value was $?\n;
my $fh = new IO::File(.listing, r)
|| die could not open '.listing': $!\n;
while (my $line = $fh-getline()) {
1 while ($line =~ s/[\012\015]$//);
my ($size, $name) = $line =~ m/\S+\s+ # permissions
\S+\s+ # can't entirely remember...
\S+\s+ # user?
\S+\s+ # group?
(\S+\s+) # size
\S+\s+ # month
\S+\s+ # day
\S+\s+ # time
(.*) # NAME
/x;
if ($line =~ /^d/ $name ne . $name ne ..) {
push @dirs, $name;
}
else {
$total += $size;
}
}
$fh-close() || die Can't close file: $!\n;
map {
my $u = $url . / . $_ . /;
$total += get_disk_space($u, $password_args, $user_args)
} @dirs;
return $total;
}
main: {
my ($user, $password);
my ($user_args, $password_args, $url) = (, , );
if (! GetOptions(user=s = \$user,
password=s = \$password,
url=s = \$url,
)) {
die(Bad command line arguments!\n);
}
die You didn't specify a URL! if ($url eq );
$user_args = --user '$user' if (defined($user));
$password_args = --password '$password' if (defined($password));
my $total = get_disk_space($url, $user_args, $password_args);
print $url\t\t$total\n;
}
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Re: du(1) for FTP sites
I wrote: [attached] gives a big skeleton of what you are looking for. The code itself could definitely be improved. Oh yeah, invoke it thusly: remote-du --url 'ftp://ftp.gnu.org/pub/old-gnu/Manuals/bfd-2.9.1/' --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: OpenStreetMap compatible GPS?
Joshua Judson Rosen writes: (we're a Debian household) I found this phrase to be entertaining...it just rolled off Joshua's tongue with the same ease that somebody might say: we're a vegetarian household we're a kosher household we have cats in our household we watch the Boston Bruins in this household we ride bicycles in this household Etc. Anyways, I found how easily a phrase like this can be uttered nowadays to be entertaining... (-: --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: [GNHLUG] NHRuby, 19 April: MongoDB
Benjamin Scott writes: Stumbled across this today, seemed to be rather more useful than most of the content-free hype I got when I tried looking up what NoSQL meant. http://blog.nahurst.com/visual-guide-to-nosql-systems This is a very interesting link! I mean, I thought key-value went out with COBOL... ;-) Oh, the irony... Ben's message was almost certainly composed using a product that employs a key-value DB... (-: Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Internet history (was: We need a better Internet)
Tom Buskey writes: Because we can't keep track of 100 systems what they do in our head. But using a naming scheme means you can script it. We don't really care about the names otherwise. Oh, and only one name because if there's another name, we'll get a ticket to fix it by the name we can't script. I used to work on a parallel computer whose compute nodes were named after stars. So, whenever I needed to do something to all of the nodes in the cluster I'd have to write code like: for H in antares atria avior sirius \ regulus becrux pollux mirtak ; do done I would have preferred a more uniform set of names, but that's the way that things go sometimes. --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Internet history (was: We need a better Internet)
Tom Buskey writes: On Thu, Apr 8, 2010 at 10:42 AM, Kevin D. Clark wrote: The problem that I had was that I frequently had to deal with the situation of this particular problem only really efficiently runs on 1, 4, or 16 nodes in the cluster or this problem only really efficiently runs on 1, 2, 4, 8, or 16 nodes in the clusternow, what nodes were these again, and how do I relate all of the logfiles that I obtained from the last program run? You might have proven my point. Just to be clear, I was trying to illustrate your point, because you an I appear to be in complete agreement on this issue. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Internet history (was: We need a better Internet)
Mark Komarinski writes: Maybe I'm not understanding the issue, but isn't the above why queuing systems were made? We're using a dirt-old version of Platform LSF and it already solves the 'running on heterogeneous systems distributed across an arbitrary number of nodes' problem. While returning the output via LSF or shared filesystem. I don't have much to say about the how to manage heterogeneous systems problem. The parallel computer that I worked extensively with in the past consisted of machines that were all running the same hardware and the same OS (this was deliberate). From my perspective, employing a boring/normalized/easily-scriptable naming scheme would have been advantageous. This isn't the scheme that was put into place ; it wasn't the end of the world for me ; I worked with this. Systems like LSF sound neat but I've never had occasion to use a system like this ; I can't comment on these things. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: NFS stops responding
Benjamin Scott writes: On Mon, Apr 5, 2010 at 9:15 AM, Kevin D. Clark wrote: Is there anything like a diff utility for pcap captures? I'm still giving some thought into how I'd actually do this in general. Hmmm. The application I was thinking of was taking captures at various points where the traffic is nominally identical, to see if it really *is* identical. Say, this looks interesting: http://www.eff.org/testyourisp/pcapdiff/ Regards, --kevin keywords: pcap diff wireshark tcpdump -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: NFS stops responding
Benjamin Scott writes: On Sat, Apr 3, 2010 at 5:19 PM, Kevin D. Clark One thing that I've done to help me understand what is going on is to rigorously go through each packet (sent and received) and verify that what got sent is the same as what got received ... Wireshark's ability to break down packets from transport to application layers can be a great help here. If using the text tshark, use the -V switch. Yes, and then you can use Perl to parse the output of tshark -V to do some detailed analysis. Is there anything like a diff utility for pcap captures? Google finds mention of something called tcpdiff, but it seems to be more aimed at the transport layer alone, and appears to be BSD (more correctly, pf) only. I'm still giving some thought into how I'd actually do this in general. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: [OT] Terminal width
Joshua Judson Rosen writes: Well, there's an alternative to wide-screen monitors allowing for wider windows: wide-screen monitors allowing for *more numerous* 80-column windows. :) Me too. Speaking for myself, as a programmer, if I am given a wide-screened monitor to work on, I use the extra space for extra 80-column windows. I think that there is something about the act of programming that lends itself to working with *tall* windows. In my experience, a tall window lets the programmer more easily understand the control flow in a program. My current laptop has a semi-wide-screened monitor. I thought I would like it when I bought it but as time has passed I've come to the conclusion that for my next monitor I'd really prefer something that is taller. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: [OT] Terminal width
Jerry Feldman writes: I usually set emacs up to close to full screen, with many more than 25 lines. I certainly like to see entire blocks of code. I still like to keep individual lines of code and comments to under 80 columns. Again -- me too! Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: NFS stops responding
Michael ODonnell writes: I'm capturing dumps of Enet traffic on the client and server boxes at a remote customer site thus: dumpcap -i eth0 -w /tmp/`hostname`.pcap ...and then copying them back to HQ where I feed them to Wireshark. I am not (yet?) rigged up so I can sniff traffic from an objective third party. I happen to be debugging a similar I want to pull my hair out of my head problem right now (but with a different protocol). One thing that I've done to help me understand what is going on is to rigorously go through each packet (sent and received) and verify that what got sent is the same as what got received (on the customer's network -- I can't reproduce this in-house...). I build up a timeline of major things that go on during the protocol interaction. This was a hard work, but eventually I was able to come to some conclusions about what might be going wrong. I'm still testing my fix though. I feel like I'm living+breathing+sleeping this problem right now. Hope this helps. --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Starting an X11 client on another machine, without ssh
Bill McGonigle writes: 2a) possibly run ssh with the null cipher, so you just get session setup. Then you're only talking about stream encapsulation/multiplexing time as a resource drag, and that can be incredibly efficient code (OS's do this all day long, layer upon layer). This is not possible with any SSH implementation that I am familiar with. You might be thinking about the SSL/TLS ability to negotiate to a null cipher/authentication scheme, but SSH!=SSL (and most implementations of anything decent that use SSL/TLS preclude you from using these null schemes, probably for the same reasons that the people who implement SSH do...). Kind regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Starting an X11 client on another machine, without ssh
Bill McGonigle b...@bfccomputing.com writes: On 03/23/2010 06:13 PM, Kevin D. Clark wrote: This is not possible with any SSH implementation that I am familiar with. Ah, found it: http://www.psc.edu/networking/projects/hpn-ssh/ Oh, that. Yes, now I remember that. I experimented around with that a bit at a previous job. I'm not sure why that set of patches didn't help with a frequent, large scp job that I had to perform, but that set of patches looked very promising. Null ciphers definitely weren't an option for me then though. Thanks for reminding me of this! --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: OT? - Broadband Troubleshooting
Greg writes: I have a problem and not sure the best approach to isolate and resolve it. My home network seems to have momentary (1-15 seconds) lapses in response time or connectivity. The network setup is pretty standard. Broadband connection, Linksys router running Tomato, a couple of (dumb) 5-8 port switches with both wired and wireless devices. I suspect the cable provider. Do you still experience this problem if you temporarily eliminate/bypass the Linksys router and the switches from your home network? Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Video card recommendation
Drew Van Zandt writes: code-editing screen, here I come! (late response due to no power) Hurray! Another person who understands that all of these wide-screen monitors aren't entirely optimal for programmingunless you rotate them, of course Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Video card recommendation
Drew Van Zandt drew.vanza...@gmail.com writes: My first thought on seeing them was Oh good, rotate them and they're perfect. Now the question is this: Do I want a 1680x1050 rotated to 1050x1680, or a 1600x1200 rotated to 1200x1600? That's close enough on height that the increased total real estate of the 1600x1200 is still tempting... I worked at a place once where it was fairly common for me to encounter code (written by humans) whose line length commonly reached out to 340 columns. So, I'd see code that looked like this: (200 columns of whitespace) print hello world\n; I guess I was...fortunate...at that job that I had a widescreened monitor. The decision as to how to orient my monitor was, in effect, made for me. Of course, if you come up with a cool programming setup for yourself, you probably ought to send along a picture of your setup, just to inspire others. Good luck! --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Interesting article, games
Lori Nagel writes: 1) User interfaces tend to be poor and over compilcated, with a bunch of skills and stats taking up the whole screen in a way you can't close as opposed to the whole screen being immersed in the game. This is a valid complaint. The reason for this is probably because these games tend to be designed by engineers rather than people who are experts at human/computer interaction. It is very hard to get human/computer interaction stuff right, but fantastically easy to get this stuff wrong. Regards, --kevin -- alumni.unh.edu!kdc / http://kdc-blog.blogspot.com/ GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E Wipe him down with gasoline 'til his arms are hard and mean From now on boys this iron boat's your home So heave away, boys. -- Tom Waits ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Introduction and Advice
Jake Tingley writes: My name is Jake and I live in Warner. I am a high school math teacher in Lebanon and I am interested in working with Linux and doing some programming. What is the best way to get started? Is there a particular distribution I should be looking at? What is a good first language to learn? What do people think are good resources (both online and books)? What kinds of things do you want to program? What are your goals? Things that I like that you might like too: Fedora (linux distribution), Perl (programming language), gnuplot (graphing package), _The Little Lisper_ (programming book), Java, C, Ruby, _Puzzled Programmers: 15 Mind-Boggling Story Puzzles to Test Your Programming Prowess_ (another book), _Godel, Escher, Bach: An Eternal Golden Braid_ (yet (another (book))). Regards, --kevin -- alumni.unh.edu!kdcGod, I loved that Pontiac. http://kdc-blog.blogspot.com/ -- Tom Waits GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: twitter vs identi.ca
Joshua Judson Rosen writes:
I guess this means that I have to figure out a different reason to
curmudge on microblogging as a whole, now Thanks a lot, Arc... ;)
{curmudgeon-mode=on}
You could start by pointing out that the body of Arc's email took up
at least 383 characters... (-:
{curmudgeon-mode=off}
Kind regards,
--kevin
--
alumni.unh.edu!kdcGod, I loved that Pontiac.
http://kdc-blog.blogspot.com/ -- Tom Waits
GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E
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Re: twitter vs identi.ca
Arc Riley writes: @Kevin ah but this is email, not microblogging Yes, I know. Kind regards, --kevin -- alumni.unh.edu!kdcGod, I loved that Pontiac. http://kdc-blog.blogspot.com/ -- Tom Waits GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Openfire Jabber server
Paul Lussier writes: Openfire docs don't seem to have a lot of information on performance tuning, does anyone here have any experience with tuning this thing for use in large environments with lots of users ? I don't have too many helpful things to say here except: 1: It sounds like you're experiencing a memory leak in your Openfire server. 2a: If [1] is true, then you're never going to be able to add enough memory to this system in order to make everything just work -- the leak will eventually consume all of your memory. 2b: One possible option might be to simply restart the server every night. 3: The only way to fix the memory leak is to fix the code or to configure the system to not execute the buggy code. The thread that Ben Eisenbraun cites gives some some suggestions as to how to do either. 4: If some particular client exacerbates this problem, this is interesting, but the root cause is still that the server is buggy. 5: Fixing memory leaks in Java code can sometimes be very difficult. As a programmer, it certainly is a relief when you find and fix these... Regards, --kevin -- alumni.unh.edu!kdcGod, I loved that Pontiac. http://kdc-blog.blogspot.com/ -- Tom Waits GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Openfire Jabber server
Ben Scott writes: While still true, there are cases where it's less cut-and-dry: In other protocols, I've seen clients do the equivalent of repeated malloc without free. Of course, the server should place limits on resources a client can allocate, but some people consider that kind of thing to be not a bug in the server, because it's working as designed. To which I say: http://tinyurl.com/ye3tkmd The way that I try to design protocols and systems is to assume that the entity at other end of the connection might be some infinitely bad thing that is looking to take down the system. Kind of like Postel's Law, but worse. If the system is designed and implemented in this way, then I sleep well at night... --kevin -- alumni.unh.edu!kdcGod, I loved that Pontiac. http://kdc-blog.blogspot.com/ -- Tom Waits GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: wanted to borrow: power supply for Mac G4 cube
Bill McGonigle writes: On 12/28/2009 04:22 PM, Kevin D. Clark wrote: In fact, my relative is interested in just retrieving a few files from this machine. Assuming you haven't found the rare part yet ... if you're going inside anyway, just pull the drive and hook it up to a USB dongle, connected to a working Mac (or linux). Oh, sorry, I guess I didn't follow up on this. I think that my relative is all set now. Thanks very much to Charlie Farinella for his kind offer to lend my relative a power supply! Kind regards, --kevin -- alumni.unh.edu!kdcGod, I loved that Pontiac. http://kdc-blog.blogspot.com/ -- Tom Waits GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
wanted to borrow: power supply for Mac G4 cube
I have a relative who has a Power Mac G4 Cube, like this: http://en.wikipedia.org/wiki/Power_Mac_G4_Cube My relative suspects that the power supply might be br0ken. The power supply looks like this: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=370291683436rvr_id=crlp=1_263602_263622UA=L*F%3FGUID=d71d15361250a02680b253f2ffceccdeitemid=370291683436ff4=263602_263622 ...and is apparently Mac part # 661-2455 M5849 This is an old computer, and my relative is not interested in putting a lot of money into this. In fact, my relative is interested in just retrieving a few files from this machine. My relative lives in Nashua. If you have such a power supply, and you'd be willing to lend this power supply to my relative for a day or two, please contact me off-list. Thanks! --kevin -- alumni.unh.edu!kdcGod, I loved that Pontiac. http://kdc-blog.blogspot.com/ -- Tom Waits GnuPG: D87F DAD6 0291 289C EB1E 781C 9BF8 A7D8 B280 F24E ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Update, was: Looking for stuff that you forgot to throw out
Tom Buskey writes: The DOS version of Kermit is still out there at Columbia. C-Kermit is also there for Unix. It's an excellent VT100 emulator as well if you want to turn a PC into a VT100 terminal. The syntax is more VMS like, but once you learn it, it works well. This reminds me of an observation that I've made over the years: if you're using the default terminal program that comes with Windows, you're probably having a bad day. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Does the on-disk image of an executable ever change?
Michael ODonnell writes: I'm looking at some supposedly identical CentOS5.3 systems that are behaving strangely and while grasping at straws I generated lists of the MD5 sums of all the files on the root partitions and I'm seeing differences in the on-disk images of things like /sbin/mount and /lib64/libblkid.so.1.0 that AFAIK are supposed to be entirely static. For *two* of the systems in question, where you are seeing a difference, can you send us the output of: sha1sum /path/to/the/file/in/question rpm -qf /path/to/the/file/in/question rpm --verify -f /path/to/the/file/in/question Obviously, I'm trying to figure out where you stand before we try anything more complicated. I can't think of a reason why these files would change in normal use. Is there any chance that these machines could have been broken into? Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: A story of cron, svn, and STDERR.
Ken D'Ambrosio writes: Hey, all. I ran into an interesting problem that drove me outright bonkers and thought I'd share the insights for those who might run into similar issues. Most of my Subversion repositories I just back up via straight flat file; one, however, being sent off-site, needs to be backed up weekly via svn dump. I wrote a small script that does the dump and then compresses it. Tried it from the command line, and it worked like a champ. Plugged it into cron, and it would get somewhere between 40 MB and 65 MB in (out of 2.4 GB), and die. No obvious rhyme or reason. Clearly, it wasn't a permissions or path issue, or I'd get 0 MB in. Finally, in attempting to re-direct STDERR to a log file... I fixed it. *BY* re-directing STDERR to a log file. Apparently either cron or svn really, really wants STDERR (even though no error was being thrown!), and this machine didn't have an MTA installed. At some point, I guess cron or svn goes to open up STDERR, for whatever darn reason, can't, and dies. Either installing an MTA (the smart move) or re-directing 2 *anywhere*, did the trick. So, can you confirm, was there anything from stderr in your logfile? Was the file zero-size at the end of the svn dump? What does your svn dump command do when you run it thusly?: svn dump 2- (Personally, as a shell-script hacker, I rarely close stderr in this manner unless I really grok the executable that is being run, because I do sometimes encounter programs that react poorly when run in this manner.) Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Remember your pearls [was grep, maybe]
Ben Scott writes: On Thu, Oct 29, 2009 at 11:01 PM, Greg Rundlett (freephile) g...@freephile.com wrote: So, you've worked out a magnificent one-liner solution to a interesting and recurring task. How do you 'remember' your solution? They get saved in a file under $HOME/bin under an appropriate name, with appropriate comments. Ideally, I turn them into a working command I can then use as needed. (Occasionally they get turned into shell aliases or functions, if the mood strikes me.) aolMe too!/aol This scheme really works for me. For example, later this afternoon I'm going to use a snippet of code I wrote in 2003 to analyze a ~1GB logfile that I have been generating for over a week now. It pays to write clean and flexible code in the first place, and it pays to be semi-organized as well. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Fairpoint files for Chapter 11
Ed lawson writes: Of course hindsight is more perceptive than foresight, (but I am responding to nobody in particular) Remember, there was even some sentiment on *this very list* that it would be better if Fairpoint was running all of this rural telco gear. The fact of the matter is that ~1.5 years ago the collective we had a choice as to who should run all of this stuff: a company that showed no interest in upgrading any of this telco gear and really wanted to get out of this business altogether, and another company who wanted to get into this business but it wasn't clear that they had the money and/or the experience to run this stuff. This wasn't a pleasing set of alternatives back then. Of course, now the situation is clearly worse. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: ldap info sought
Ben Scott dragonh...@gmail.com writes: FWIW, I know rather more than I want to about Active Directory, Windows systems admin, and Linux/Samba/AD integration, so if there's anything I can do to help on that front, post and I might be able to. Thank you for the kind offer. Like I said, I am interested in learning the information schema in things like AD. I'm going to keep on poking around. Thanks! --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
ldap info sought
Suppose that I know enough about LDAP to be dangerous, but I want to know more. Suppose I want to more fully understand: 1: the mindset of people who use LDAP for solutions 2: the information schema in Active Directory 3: the information schema in eDirectory I've observed some very knowledgable people on this list mention some of the things that they are doing with LDAP. So, my request is this: what resources (books, websites, etc.) do people recommend to learn more about this subject? Thanks very much, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: ldap info sought
Mark Komarinski writes: Kevin D. Clark wrote: So, my request is this: what resources (books, websites, etc.) do people recommend to learn more about this subject? Honestly? Trial and error. [...] I'm getting this impression as well. At least I am mastering the error part of this anyways. (-: I can tell you that we're using Centrify to provide AD authentication to Linux workstations and servers. It's pretty neat software, even if you already have the UNIX extensions in AD. It also comes with a kerberized version of the openldap utilities that you can use to talk to AD directly. Digging into that is how I got most of my AD/LDAP info. Very interesting -- thanks! I'll have to check this out. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: sendmail configuring port numbers Let's try again.
Ben Scott writes: I was tempted to do something goofy, like reverse all the characters in your text, just to get you going, but I'm too tired to go to the effort right now. ;-) perl -0777 -ne 'print join , reverse split //' Regards, --kevin (who sends all of his email using technology from RFC1149) -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Open Source Photography
Ted Roche writes: I think I saw this written up in one of ACM's magazines, but those don't get a lot of traffic. NPR did a story on a group at Stanford doing computational photography - camera hardware with a Linux backend. Another interesting thing is CHDK: http://chdk.wikia.com/wiki/CHDK Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Open Source Photography
Ted Roche writes: For folks just tuning in, the Canon Hack Development Kit is an add-on to the firmware for the Canon Powershot series of cameras that offers lots of extensions to the functionality. Sadly, my Powershot passed away a while ago, or I'd have fun testing this stuff. I have seen some rather nice pictures from people who use CHDK. For example, there are some nice scripts (etc.) available now that let a photographer easily capture images of lightning bolts. I'd love to try out CHDK myself, but the cheapie Canon camera that I own doesn't work with it and I haven't had the time to contribute. I have a friend who uses CHDK with great results. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: How To Ask Questions The Smart Way
Lori Nagel writes: It took me half a year just to figure out how to add the math library into the compiler so I could compile some basic C programs from one of the C programing books I have. Sorry, I must politely disagree that a situation like this relates in any way to any of the negative aspects of that document. I have little insight into your stuggles with this particular problem (I wasn't there watching you struggle -- I don't know you) but I would point out that when you posted a query about this very topic on this mailing list your question was smart enough to generate several helpful responses (including from me...). In general, if you do your homework and strive to ask a reasonably smart question, in my experience, you will get a reasonable response. Kind regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
How To Ask Questions The Smart Way
For no particular reason, I will mention that I think that this is a really good document. http://catb.org/~esr/faqs/smart-questions.html I hope that others enjoy it as well. Kind regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: How To Ask Questions The Smart Way
Lori Nagel writes: For no particular reason, I will say I do not think very highly of that document. Everybody is entitled to their opinion. In fact, I do not agree with every aspect of that document. But overall I like it. Kind regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: How To Ask Questions The Smart Way
Ken D'Ambrosio writes: He's clearly been a force for good. But there's been an awful lot of baggage he's dragged around with him, and it seems to seep into most all his writings to some extent or another. Ken has expressed here, more elegantly than I could have, my main objections to this document. Kind regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: I want my KDiff3
Greg Rundlett (freephile) writes: Yes, I can use Meld, but like the song says: lyrics artist=ZZ TopI want my MTV/lyrics I want my KDiff3 Hmm. I don't know if Meld does what you want here, but I am a big fan of Meldit's the prettiest diff too I've ever used. I'm also a big fan of ediff mode in X?Emacs. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Why Linksys routers are so cheap...
Bill McGonigle writes: You can number and name VLAN's. The range is 1-4092, but I read only 64 simultaneous are available. Yes, this is because each VLAN on the switch is modeled as being its own seperate instantation of a bridge, and each instance takes up system resources. [...] There's another tab called 'PVID (Port VLAN ID)'. You can type in a VLAN # here for each port. I don't understand what this does that the previous tagging doesn't. The help pages are syntactical, not conceptual in nature. The PVID is the default VLAN tag that will be applied to an untagged frame upon ingress to the switch. Regards, --kevin -- If the packet is transmitted, it will fall into the ether; If it remains in the queue, it will exceed its TTL, That little VLAN tag Is a very strange thing. ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Digital Voice Recorders and Linux
Arc Riley writes: The sandisk is a much better deal. 2gigs flash for just $30 *and* has a microSDHC slot. Mounts as a standard USB drive. Small, bright OLED screen, and you can dual purpose it to play all your .ogg and .flac files. downside is voice recording only works to .wav - you can encode from there on your computer easily enough. I've got some sort of SanDisk Clip right next to me right now and I can confirm that it records voice to WAV files: $ file /media/flash/RECORD/VOICE/VORC001.WAV /media/flash/RECORD/VOICE/VORC001.WAV: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 24000 Hz I just listened to a voice recording that I made with the thing and the quality was acceptable to me. My Clip is a 4GB $50 model. It works pretty well. The only downside I can report with the thing is that every 3-4 months it seems to suffer a failure when I mount the thing that causes every single song that I wrote onto the thing to disappear. This is when I am glad that I made backups. It also works very well with my favorite ripping tool, Cretin (http://sourceforge.net/projects/cretin/) . Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Make Q's
Derek Atkins writes:
Perhaps you need an 'extern C' in there so C++ knows how to call the C
functions?
To cut to the chase, Bruce probably should make sure that all of his C
functions are declared in C-specific header files that have the
following pattern:
#ifndef UTIL_H
#define UTIL_H
#ifdef __cplusplus
extern C {
#endif
void some_function_with_c_linkage();
#ifdef __cplusplus
}
#endif
#endif /* UTIL_H */
Bruce will also want to make sure that his C functions are compiled by
an actual C compiler.
This advice is a little bit of my opinion and a little bit of an
inflexible you must do this if you want this to work.
Regards,
--kevin
Keywords: name-mangling
--
GnuPG ID: B280F24EGod, I loved that Pontiac.
alumni.unh.edu!kdc-- Tom Waits
http://kdc-blog.blogspot.com/
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Re: Make Q's
bruce.labitt writes: I've not seen this type of code before. I wonder why all of my previous code even works. Surely it is a way to do it. Is there a simpler way? (Not that the above is hard by any means.) Can you tell us, which books on C and C++ do you have in your work area right now? Thanks, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Make Q's
bruce.lab...@autoliv.com writes: Kevin Clark wrote: bruce.labitt writes: I've not seen this type of code before. I wonder why all of my previous code even works. Surely it is a way to do it. Is there a simpler way? (Not that the above is hard by any means.) Can you tell us, which books on C and C++ do you have in your work area right now? That's easy. Nada. I do have a copy of KR C book at home. Someone here has some C++ books, though I haven't looked at them. *plonk* --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Make Q's
bruce.lab...@autoliv.com writes: There are two files that need to be compiled with gcc, and five with g++. (completely un-tested) MYFLAGS=-g -Werror -Wall -Wcast-qual CFLAGS=$(MYFLAGS) CXXFLAGS=$(MYFLAGS) # we define _XOPEN_SOURCE because # we define _GNU_SOURCE because # modify to suit to your situation CPPFLAGS=-D_XOPEN_SOURCE=500 -D_GNU_SOURCE # file1 and file2 are C files, the rest are C++ files OBJS=file1.o file2.o file3.o file4.o file5.o file6.o file7.o .PHONY: all clean war all: myproject clean: $(RM) $(OBJS) myproject.o myproject: myproject.o $(OBJS) $(CXX) $(CXXFLAGS) $+ -o $@ $(LDFLAGS) war: @echo make love not war Hope this helps, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Make Q's
bruce.labitt writes: Kevin D. Clark wrote on 09/17/2009 12:03:20 PM: # we define _XOPEN_SOURCE because # we define _GNU_SOURCE because # modify to suit to your situation CPPFLAGS=-D_XOPEN_SOURCE=500 -D_GNU_SOURCE where are CPPFLAGS used below? They're not ; my example relies upon GNU Make's well known implicit rules, documented here: http://www.gnu.org/software/make/manual/make.html#Catalogue-of-Rules How is CXX defined? Will this automagically select gcc for *.c and g++ for *.cpp? $ cat ~/Makefile.test all: @echo CC is $(CC) and CXX is $(CXX) $ make -f ~/Makefile.test CC is cc and CXX is g++ $ cc -v ... How can the dependencies (header files) be pulled in? That is harder to do. gcc -M might do a large part of what you are looking for. You'll need to get very adept at these things in order to make this aspect work. --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Make Q's
Bruce Labitt writes: Three questions: 1. Is it possible to have a project that some files are compiled with g++ and others gcc? Yes. I do this all the time. 2. In the link phase one needs to use g++, correct? Yes, if you are trying to link together a collection of C and C++ files and produce an executable from these. 3. Is there a way to automate the compilation so that the *.c files get compiled by gcc and the *.cpp by g++? Yes. This a good idea to setup, IMHO. Hmm, one more question. Anyone have a favorite writeup or tutorial on make? Google reveals lots of them - most are trivial. I had one that was pretty good, but somehow have misplaced the URL. Look, I could write a big writeup here, giving you a complete example of a Makefile that is similar to what I know you are looking for, but in actuality let me just tell you that I happen to be a big fan of the GNU Make manual. I think that in 20 minutes of skimming you'll be well on your way. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Packing/unpacking binary data in C - doubles, 64 bits
Bruce Labitt writes: Kevin D. Clark wrote: 2: Typically, binary stuff is sent over the network in network byte order and network byte order is big-endian. This statement is not universally agreed to -- in fact I used to work at a shop where they'd never even considered this problem and it turned out that they were sending (most) stuff over the wire in little-endian format. That only works if both ends are the same - definitely not portable. In my case, the client is little-endian and the server is big-endian. No, that always works and it is definitely portable. Read what I said again: when you transmit binary integers onto the wire, make sure they exist in network-byte-order. May I politely suggest that you consult a decent computer networking book? Please take a look at the functions htonl() and ntohl(). Question: from your various postings on this list, I gather that you are using MPI. If this is true, why aren't you just using things like MPI_INT, MPI_DOUBLE, and possibly MPI_LONG_LONG? Why not let your MPI library take care of details like this for you? I guarantee you that any decent MPI implementation is going to be well-debugged and efficient. It should also take care of any endian issues that you might encounter. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Packing/unpacking binary data in C - doubles, 64 bits
Ben Scott writes: We keep seeing the recommendation to use highly-portable encodings when possible, e.g., ASCII, or some kind of self-descriptive encoding. Which I fully agree is a very good idea. But assume for the sake of discussion we want to keep overhead as low as possible for performance reasons, and wait until computers get faster isn't a practical solution. What techniques, best practices, de facto standards, popular libraries, etc., exist for this sort of thing? If somebody were to disallow me from suggesting a solution to this problem which relied upon ASCII text, then my next proposed solution would be to use ASN.1 with either a DER or PER encoding. If you think that this is a better solution, then more power to you. Obviously, putting unsigned integers into network byte order for transmission is one such best practice. What about signed integers? Can one expect hton*() and ntoh*() to work for signed integers as well? IIRC, most machines store signed ints in two's-complement format, which I think would survive and work properly if swapped to compensate for an endianess change, but I'm not sure. Yes, htonl() et al. work just fine with two's compliment machines. IIRC, I haven't worked with a machine that didn't use a two's compliment as its internal representation for integers in over two decades, so I really am not enthusiastic about investigating this particular problem. Yeah, yeah, somebody might be tempted at this point to chirp up with a statement like but I used to use the lovely Frobozz 9000 machine (which used one's-compliment) back in the 80's to perform ray-tracing and accounting functions!!!, to which I will pre-emptively respond Yawn.. What about floating point? ASN.1 and BER/PER encoding... Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
Re: Classic running out of memory... huh? what? long
bruce.lab...@autoliv.com writes: Anyways, the program seems to run out of memory after processing many blocks. So either there is a memory leak, or something else going on. Any suggestions? ... Any good memory tracking tools? I have used valgrind but not gained much insight. Must be operator error... I would suggest that you run your program in conjunction with Valgrind with some small-to-medium sized datasets and fix the problems that are reported. I say small-to-medium sized so that you don't have to wait a long time to see what is going wrong. I am a huge fan of Valgrind. It is an awesome tool that is worth knowing how to use. Regards, --kevin -- GnuPG ID: B280F24EGod, I loved that Pontiac. alumni.unh.edu!kdc-- Tom Waits http://kdc-blog.blogspot.com/ ___ gnhlug-discuss mailing list gnhlug-discuss@mail.gnhlug.org http://mail.gnhlug.org/mailman/listinfo/gnhlug-discuss/
