Re: Php perl?
Gary Stainburn wrote: Just to put things into perspective here 1) I made the comment about the start-up speed. 2) Although I use PHP frequently my feet are FIRMLY in the Perl camp 3) Unix Fork/Load/Exec cycle *IS* slow because of the amount of work involved. The MS equiv will be just as slow 4) The F/L/E cycle has to be done *every* time the CGI is requested. The PHP interpreter is already loaded and therefore *WILL* have a quicker startup. I don't have figures to back it up, but I would imagine Perl scripts exec much quicker that PHP asuming both scripts perform the same function. (From memory) Using mod_perl will only require scripts to be loaded and compiled once per lifetime of the apache daemon so will be much quicker overall and provide less load on the server than either traditional CGI's. The question I have is with the current Apache (2.x) and mod_perl (1.27?) involved, when a perl program is incorporated into the httpd process in this manner, how much more *memory* overhead does each httpd process require over related circumstances in php? for example if I use CGI.pm to create a form (using its functional interface to produce the actual HTML seen) and also respond to said form, how much more RAM will each httpd process require if this is run under mod_perl ? One argument I've been handed by the php camp is that in a mod_perl situation, this will cause apache processes to become much larger, thereby taking up more of the precious memory resources. (consider a large gaming website like planetunreal (which IIRC uses .asp), or quakeworld, which garner huge volumes of hits on a daily basis) This issue needs to be addressed firmly to the php camp, because the FUD being spread was enough to cost me one of the most fun hobby projects I was involved with, and the one that got me started on the perl path to begin with while they were still on .asp and had not yet migrated the site to a linux server and mod_php... -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: How to measure Array or Hash's byte size ?
Vincent Bufferne wrote: What's about: my @foo = ( '1', '2' ,'3' ); my $size = $#foo + 1; print table size $size\n; Ouput: table size 3 print Table size: , scalar(@foo), \n; -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
random sub returns same results...
Hi Gurus!
I have the following sub which creates a random
string. Each time I call the sub in my perl
script it returns a random string which is fine.
The problem is every time I run the script the
same strings are returned. I'm running perl
5.001 on Windows 2000.
sub RandomStr
{
my $i=0;
my $str=;
foreach(0..9,a..z,A..Z)
{ $i++;
$arr[$i]=$_
}
for($j=0;$jrand(30);$j++)
{
$str.=$arr[rand(58)+1]
}
return $str;
}
So if I run my script calling the above three
times I get:
brLNh
96
x9k
If I run it again I get the same three strings.
Why?
Is there a better way to get a random string?
Thanks!
Meriwether
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Help needed: Simple HASHES question
1. What is the difference between Line #1 and Line #2?
2. Why is the Line #2 declaration incorrect?
use strict;
my %option;
$option {'q'} = new CGI;
#Line 1-
$option{'Mon'} = 'Monday';
#Line 2 -
$option-{'Tue'} = 'Tuesday';
print $option{'q'} - header(),
$option{'q'} - start_html();
print $option{'q'} - end_html;
#thanks---
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Re: Help needed: Simple HASHES question
sorry for the spam - my question has been answered
Hotmail was filtering the discussion list.
C
1. What is the difference between Line #1 and Line #2?
2. Why is the Line #2 declaration incorrect?
use strict;
my %option;
$option {'q'} = new CGI;
#Line 1-
$option{'Mon'} = 'Monday';
#Line 2 -
$option-{'Tue'} = 'Tuesday';
print $option{'q'} - header(),
$option{'q'} - start_html();
print $option{'q'} - end_html;
#thanks---
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Re: random sub returns same results...
perldoc -f srand
- Original Message -
From: meriwether lewis [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, April 05, 2003 10:09 AM
Subject: random sub returns same results...
Hi Gurus!
I have the following sub which creates a random
string. Each time I call the sub in my perl
script it returns a random string which is fine.
The problem is every time I run the script the
same strings are returned. I'm running perl
5.001 on Windows 2000.
sub RandomStr
{
my $i=0;
my $str=;
foreach(0..9,a..z,A..Z)
{ $i++;
$arr[$i]=$_
}
for($j=0;$jrand(30);$j++)
{
$str.=$arr[rand(58)+1]
}
return $str;
}
So if I run my script calling the above three
times I get:
brLNh
96
x9k
If I run it again I get the same three strings.
Why?
Is there a better way to get a random string?
Thanks!
Meriwether
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Re: random sub returns same results...
Meriwether Lewis wrote:
Hi Gurus!
I have the following sub which creates a random
string. Each time I call the sub in my perl
script it returns a random string which is fine.
The problem is every time I run the script the
same strings are returned. I'm running perl
5.001 on Windows 2000.
sub RandomStr
{
my $i=0;
my $str=;
foreach(0..9,a..z,A..Z)
{ $i++;
$arr[$i]=$_
}
for($j=0;$jrand(30);$j++)
{
$str.=$arr[rand(58)+1]
}
return $str;
}
So if I run my script calling the above three
times I get:
brLNh
96
x9k
If I run it again I get the same three strings.
Why?
Perl tries to 'seed' its random number generator from various
system values to make it different each time. Its first attempt
is to read a value from the system device /dev/urandom which
will be used if the read is successful. Clearly this isn't working
properly in your case so perhaps your urandom device is
misbehaving?
An alternative is that you may incorrectly be calling 'srand' to
seed the random number generator. If you pass a constant
to this function then the random number sequence will be
the same each time.
Is there a better way to get a random string?
If this suits your purpose, then no. You code could be a lot
better laid out though. Take a look at this for inspiration:
sub RandomStr {
my $str;
my @arr = (0..9, a..z, A..Z);
$str .= $arr[rand(@arr)] for 1 .. rand(30);
$str;
}
HTH,
Rob
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Queue Suggestions?
I'm posed with a problem, looking for suggestions for possible resolution. I have a script that has many steps in it, including telnet ftp sessions, database unloads, and other routines. This script will run on a server, accessing a remote server. This works fine. I will likely have several dozen (maybe as many as 100) iterations of this script running simultaneously. The problem is, that their is a bottleneck towards the end of my script -- I have to call a 3rd party process that is single-threaded. This means that if I have ~100 versions of my script running, I can only have one at a time execute the 3rd party software. It is very likely that multiple versions will arrive at this bottle-neck junction at the same time. If I had more than one call the third party program, one will run, one will loose, and die. So I am looking for suggestions on how I might attack this problem. I've thought about building some sort of external queue (like a simple hash file). The servers have numbers like server_01, server_02, etc. When a iteration of the script completes, it writes out it's server name to the file, pauses, then checks of any other iteration is running the third party software. If one is running, it waits, with it's server name at the top of the file queue, waiting. A problem might be if again, two or more versions want to update this queue file, so I thought maybe a random-wait period before writing to the file-queue. I'm open to other ideas. (please don't suggest we rename or copy the third party software, it just isn't possible). I'm not looking for code, per se, but ideas I can implement that will guarantee I will always only have one copy of the external third party software running (including pre-checks, queues, etc. Thanks, Jeff __ Do you Yahoo!? Yahoo! Tax Center - File online, calculators, forms, and more http://tax.yahoo.com -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
sendmail not working
Hello, i have the script below retest.pl, and whe i try to run it i get nothing. [EMAIL PROTECTED] cgi-bin]# perl retest.pl [EMAIL PROTECTED] cgi-bin]# -retest.pl # Open Sendmail open(MAIL, |/usr/lib/sendmail -t); # Write to the sendmail program print MAIL To: [EMAIL PROTECTED]; print MAIL From: [EMAIL PROTECTED]; print MAIL Subject:Your Subject\n\n; print MAIL Your message here; # Close the sendmail program close(MAIL); --- Cheers Mel _ Use MSN Messenger to send music and pics to your friends http://www.msn.co.uk/messenger -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Queue Suggestions?
Hello, maybe you can use flock perldoc -f flock I have never used this and dont know if it works in your case. /Stefan I'm posed with a problem, looking for suggestions for possible resolution. I have a script that has many steps in it, including telnet ftp sessions, database unloads, and other routines. This script will run on a server, accessing a remote server. This works fine. I will likely have several dozen (maybe as many as 100) iterations of this script running simultaneously. The problem is, that their is a bottleneck towards the end of my script -- I have to call a 3rd party process that is single-threaded. This means that if I have ~100 versions of my script running, I can only have one at a time execute the 3rd party software. It is very likely that multiple versions will arrive at this bottle-neck junction at the same time. If I had more than one call the third party program, one will run, one will loose, and die. So I am looking for suggestions on how I might attack this problem. I've thought about building some sort of external queue (like a simple hash file). The servers have numbers like server_01, server_02, etc. When a iteration of the script completes, it writes out it's server name to the file, pauses, then checks of any other iteration is running the third party software. If one is running, it waits, with it's server name at the top of the file queue, waiting. A problem might be if again, two or more versions want to update this queue file, so I thought maybe a random-wait period before writing to the file-queue. I'm open to other ideas. (please don't suggest we rename or copy the third party software, it just isn't possible). I'm not looking for code, per se, but ideas I can implement that will guarantee I will always only have one copy of the external third party software running (including pre-checks, queues, etc. Thanks, Jeff -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Queue Suggestions?
Jeff Westman wrote: I'm posed with a problem, looking for suggestions for possible resolution. I have a script that has many steps in it, including telnet ftp sessions, database unloads, and other routines. This script will run on a server, accessing a remote server. This works fine. I will likely have several dozen (maybe as many as 100) iterations of this script running simultaneously. The problem is, that their is a bottleneck towards the end of my script -- I have to call a 3rd party process that is single-threaded. This means that if I have ~100 versions of my script running, I can only have one at a time execute the 3rd party software. It is very likely that multiple versions will arrive at this bottle-neck junction at the same time. If I had more than one call the third party program, one will run, one will loose, and die. So I am looking for suggestions on how I might attack this problem. I've thought about building some sort of external queue (like a simple hash file). The servers have numbers like server_01, server_02, etc. When a iteration of the script completes, it writes out it's server name to the file, pauses, then checks of any other iteration is running the third party software. If one is running, it waits, with it's server name at the top of the file queue, waiting. A problem might be if again, two or more versions want to update this queue file, so I thought maybe a random-wait period before writing to the file-queue. I'm open to other ideas. (please don't suggest we rename or copy the third party software, it just isn't possible). I'm not looking for code, per se, but ideas I can implement that will guarantee I will always only have one copy of the external third party software running (including pre-checks, queues, etc. Currently I am implementing a system that has similar features, initially we developed a set of 3 queues, one a pre-processor that handles many elements simultaneously, a middle queue (incidentally that handles external encryptions/decryptions) which are very slow (seconds rather than milli or micro seconds, and a final queue that handles sending of files, FTP/SMTP which can be very very slow (hours depending on FTP timeout limits...grrr I know) For this we were looking for essentially an event based state machine concept, which (thank god) led my searching to POE (since I keep mentioning it, this is why): http://poe.perl.org After getting over the POE learning curve developing my queues was a snap. Because of business decisions we have since moved to a 9 queue system (inbound/outbound sets, plus a post processing queue, plus a reroute queue (don't ask)). Essentially a similar setup would work for you, where your middle queue would have a threshold of 1 (aka only one process at a time) whereas all of our stages are acceptable to have multiple versions running, but we want to limit the number of encryption processes happening simultaneously because of load rather than problems. You may also want to have a look at the Event CPAN module, it provides similar but lower level functionality. I can provide more details about the implementation of our system and the development of our queues if you wish, but much to my dismay I cannot provide source... hopefully this will get you started in any case, be sure to check out the example POE uses, particularly the multi-tasking process example. http://danconia.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: sendmail not working script
mel awaisi wrote: Hi, this is the whole script: #!/usr/bin/perl use strict; use warnings; # Open Sendmail open(MAIL, |/usr/lib/sendmail -t); # Write to the sendmail program print MAIL To: [EMAIL PROTECTED]; print MAIL From: [EMAIL PROTECTED]; print MAIL Subject:Yoour Subject\n\n; print MAIL Your messsage here; # Close the sendmail program close(MAIL); As an aside you shouldn't use sendmail directly to send messages from Perl, while in most cases it will work, it makes your scripts less portable and will lead to more problems, you should use one of the many modules available at CPAN. Mail::Mailer, MIME::Lite, Mail::Message, to name just a few... Have you checked the path to sendmail? Are you sure the local sendmail server is running? What does the maillog say, it should provide an error or sending information? http://danconia.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: sendmail not working
mel awaisi wrote: Hello, i have the script below retest.pl, and whe i try to run it i get nothing. [EMAIL PROTECTED] cgi-bin]# perl retest.pl [EMAIL PROTECTED] cgi-bin]# -retest.pl # Open Sendmail open(MAIL, |/usr/lib/sendmail -t); # Write to the sendmail program print MAIL To: [EMAIL PROTECTED]; print MAIL From: [EMAIL PROTECTED]; print MAIL Subject:Your Subject\n\n; print MAIL Your message here; # Close the sendmail program close(MAIL); --- Cheers Mel Mel, what is going on here? A few days ago, you posted two scripts together, one of which was apparently working well and doing what you are trying to do with this. That script used Net::SMTP and was much more elaborate and robust that this one. You indicated that that script was working, but that you wanted it to wrok together with the other one. Now after combining the other two, you have posted a completely different mail script, and one that could not possibly be mistaken for the earlier one, if you had actually looked at both. You do not seem to have noticed the difference. This indicates to me a serious problem with your approach to using assistance. Go back and look over your posts. I assume you have a Sent-Mail file? Folks on this list are trying to help people who are writing their own code. We post examples so that people can follow the flow of the logic and see its effects. These are meant to be studied to understand the operations they contain. They are not meant to be simply pasted into your script as working code. Please post again, and try to explain in detail what you are learning about the processes contained in these scripts. Joseph -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Queue Suggestions?
Jeff Westman wrote: I'm posed with a problem, looking for suggestions for possible resolution. I have a script that has many steps in it, including telnet ftp sessions, database unloads, and other routines. This script will run on a server, accessing a remote server. This works fine. I will likely have several dozen (maybe as many as 100) iterations of this script running simultaneously. The problem is, that their is a bottleneck towards the end of my script -- I have to call a 3rd party process that is single-threaded. This means that if I have ~100 versions of my script running, I can only have one at a time execute the 3rd party software. It is very likely that multiple versions will arrive at this bottle-neck junction at the same time. If I had more than one call the third party program, one will run, one will loose, and die. So I am looking for suggestions on how I might attack this problem. I've thought about building some sort of external queue (like a simple hash file). The servers have numbers like server_01, server_02, etc. When a iteration of the script completes, it writes out it's server name to the file, pauses, then checks of any other iteration is running the third party software. If one is running, it waits, with it's server name at the top of the file queue, waiting. A problem might be if again, two or more versions want to update this queue file, so I thought maybe a random-wait period before writing to the file-queue. I'm open to other ideas. (please don't suggest we rename or copy the third party software, it just isn't possible). I'm not looking for code, per se, but ideas I can implement that will guarantee I will always only have one copy of the external third party software running (including pre-checks, queues, etc. I don't think you need to get this complex Jeff. If your bottleneck were /at/ the end of the processing I would suggest a queue file as you describe, but not as a means of synchronising the individual scripts. As its final stage each script would simply append the details of its final operation to a serial file and then exit. It would then be the job of a separate process to look at this file periodically and execute any request which may have been written. That will effectively serialise your operations. However, since your process may not be able to exit straight away, what you need, as Stefan says, is a simple dummy file lock. The following will do the trick use strict; use Fcntl ':flock'; open my $que, queue or die Couldn't open lock file: $!; flock $que, LOCK_EX or die Failed to lock queue: $!; do_single_thread_op(); flock $que, LOCK_UN; close $que; Fcntl is there solely to add the LOCK_EX and LOCK_UN identifiers. I've opened the file for append so that the file will be created if it isn't already there, but will be left untouched if it is. The 'flock' call to lock exclusively will wait indefinitely until it succeeds, which means that the process has come to the head of the queue. It then has sole access to your third-party process and can use it as it needs to before unlocking the file, when the next process that it may have been holding up will be granted its lock and can continue. I hope this helps, Rob -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Php perl?
George Schlossnagle wrote: ... Answering FUD FUD = ? Joseph -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Php perl?
On Saturday, April 5, 2003, at 04:07 PM, R. Joseph Newton wrote: George Schlossnagle wrote: ... Answering FUD FUD = ? Fear, Uncertainty and Doubt. Basically unsubstantiated comments used to discredit a (competing) product. -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: unix permissions
[EMAIL PROTECTED] wrote: I'm writing a file browser script. I've learned about chmod and unix permission numbers and what they represent. But how do I determine the owner, group and other permission settings. Is there a perl module that makes this chore easy? perldoc -f stat perldoc -f chmod http://danconia.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: unix permissions
[EMAIL PROTECTED] wrote: I'm writing a file browser script. I've learned about chmod and unix permission numbers and what they represent. But how do I determine the owner, group and other permission settings. Is there a perl module that makes this chore easy? Thanks Tricia There are a few. If you are interested specifically in the Unix permission model, though, you might want to work with the output of the ls -al command. The permission string is at the left of each line returned, and has 10 characters, first the directory, then the r [read] w [write] and x [execute] permissions for owner, group and world respectively. By taking the substring from each line, then, you can parse each for the permission appropriate to each category. Joseph -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: unix windows permissions
Does windows use the chmod command in the same manner as unix
GD under Win32 - PPM missing?
Hello everyone - I'm fairly new to Perl, using Win32. I want to use perl to create some graphs on the fly of data in a table in mySQL. Not so hard, huh? A million people must have done this already. But the problem is, I can't seem to get GD, short of compiling the bugger myself, which I would really rather not do. In summary: all the documentation seems to suggest that a) I should have GD already and b) if I don't, it should be easy to install. However, this is not the case, so I'm very confused and could use some help :-) -- Details -- I already have ActiveState Perl 5.8. A search of past mailing list questions on this topic suggests that you should be able to install GD using PPM. Activestate suggests this too: http://aspn.activestate.com/ASPN/Modules/Perl/dist_html?dist_id=8887 But when I do ppm search GD I get a list of five GD-related modules, but not GD itself. What's up with that? Is it because I don't have the GD library installed? And before you ask, no, it's not because GD is already installed - I tried that! I don't have GD.pm anywhere useful. Also, I'm fairly sure that the perl GD module is just the interface to the GD library. I've found the GD library for Win32, I think, at the GNUWin32 project: http://sourceforge.net/project/showfiles.php?group_id=23617release_id=29152 But having downloaded it, what am I supposed to do with it? Just slap the DLL into my windows/system32 directory? Having hit these problems, I made the assumption that my PPM is broken for some reason and downloaded GD from CPAN manually. I have no idea how to get things to install using this method, either, but the README told me this: 3. Does GD run with MacPerl/Win32 Perl? Yes. The latest MacPerl and ActiveState binaries come with GD already compiled in and ready to go. Which sounds nice enough, but if that's the case, why does use GD make my scripts fall over because of dependency issues? --- end details -- Any help appreciated! Seldo. Seldo Voss: www.seldo.com ICQ #1172379 or [EMAIL PROTECTED] If you can't find the time to do it right the first time, when will you find the time to do it over? -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: unix permissions
R. Joseph Newton wrote: [EMAIL PROTECTED] wrote: I'm writing a file browser script. I've learned about chmod and unix permission numbers and what they represent. But how do I determine the owner, group and other permission settings. Is there a perl module that makes this chore easy? Thanks Tricia There are a few. If you are interested specifically in the Unix permission model, though, you might want to work with the output of the ls -al command. The permission string is at the left of each line returned, and has 10 characters, first the directory, then the r [read] w [write] and x [execute] permissions for owner, group and world respectively. By taking the substring from each line, then, you can parse each for the permission appropriate to each category. This is the *wrong* way to approach getting the permissions for the file, the 'stat' builtin will do the same thing and does not require shelling out nor screen scraping. perldoc -f stat perldoc File::stat http://danconia.org -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Queue Suggestions?
Rob, I think you're right. I think the idea would be to have the server name next-to-be-processed append to the file, then the next step call a single separate script (start it if not already running, otherwise simpley wait) that would lock the control file, and this script would be the single entry point to the 3rd party software, controlling processes to run only one at a time. My thinking before was to have this be part of every script (last step), but then it got real complicated thinking about queues, random wait times and then checking, double checking, etc. Sometimes simpler is better. Thanks for the suggestion! -Jeff ___ I don't think you need to get this complex Jeff. If your bottleneck were /at/ the end of the processing I would suggest a queue file as you describe, but not as a means of synchronising the individual scripts. As its final stage each script would simply append the details of its final operation to a serial file and then exit. It would then be the job of a separate process to look at this file periodically and execute any request which may have been written. That will effectively serialise your operations. However, since your process may not be able to exit straight away, what you need, as Stefan says, is a simple dummy file lock. The following will do the trick use strict; use Fcntl ':flock'; open my $que, queue or die Couldn't open lock file: $!; flock $que, LOCK_EX or die Failed to lock queue: $!; do_single_thread_op(); flock $que, LOCK_UN; close $que; Fcntl is there solely to add the LOCK_EX and LOCK_UN identifiers. I've opened the file for append so that the file will be created if it isn't already there, but will be left untouched if it is. The 'flock' call to lock exclusively will wait indefinitely until it succeeds, which means that the process has come to the head of the queue. It then has sole access to your third-party process and can use it as it needs to before unlocking the file, when the next process that it may have been holding up will be granted its lock and can continue. I hope this helps, Rob __ Do you Yahoo!? Yahoo! Tax Center - File online, calculators, forms, and more http://tax.yahoo.com -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
