Linux-Announce Digest #510, Volume #3 Fri, 11 Jun 99 18:13:35 EDT
Contents:
XDND Drag-And-Drop protocol version 4 (John Lindal)
WWW: New Linux User Group Website ([EMAIL PROTECTED])
treescan 0.5 - optimised search for files in a directory tree (Jamie Lokier)
XNotesPlus v3.2 - sticky notes program ("Michael J. Hammel")
aumix 1.21 - adjust an audio mixer (Trevor Johnson)
UseNet Offers Free NewsGroup Access. (Dwight Ringdahl)
strace 3.99.1 release (Wichert Akkerman)
COMMERCIAL: Enterprise Development Suite on Linux (SuperNova)
LOCAL: Perry Metzger/Open Source Firewalling at NYLUG, 6/16 @ 6:30pm (Jim Gleason)
----------------------------------------------------------------------------
From: [EMAIL PROTECTED] (John Lindal)
Subject: XDND Drag-And-Drop protocol version 4
Date: Thu, 10 Jun 1999 21:42:11 GMT
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Version 4 of the XDND Drag-And-Drop protocol is finished. The protocol is
described at
http://www.its.caltech.edu/~jafl/xdnd/
The protocol for dropping on the root window has been rewritten to conform
to the latest Gtk+ implementation.
This protocol is now supported by JX, Qt, and GTK+, so programs written for
Gnome, programs written for KDE, and programs like Code Crusader and Arrow
will all be able to work together on the same desktop.
The full (and growing) list of supporters is at
http://www.its.caltech.edu/~jafl/xdnd/supporters.html
John Lindal
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From: [EMAIL PROTECTED]
Subject: WWW: New Linux User Group Website
Date: Thu, 10 Jun 1999 21:39:15 GMT
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There is a new User group website that is still in the early stages of
bieng developed. For all thos who want to check it out the address
is:-
http://linux.ukweb.nu
Any comments will be greatly appreciated and can be made in the guest
book.
Thanks in advance
The Staffordshire Linux User Group.
Please remove the FGGXMA before replying by email.
***** Posted via the UK Online online newsreader *****
Go to http://www.ukonline.co.uk to find out
about other online services we offer our subscribers.
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From: Jamie Lokier <[EMAIL PROTECTED]>
Subject: treescan 0.5 - optimised search for files in a directory tree
Date: Thu, 10 Jun 1999 21:45:44 GMT
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Announcing Treescan version 0.5
``A Faster Find''
Jamie Lokier, 9th June 1999
Description
- -----------
Treescan finds all the files in a directory tree and prints their
names, using an optimised disk access strategy.
It is similar to `find -print'. The added feature is that Treescan
optimises the I/O in various ways. It is sometimes much faster than the
naive strategy used by `find'.
There is an option to prime the system cache with the inodes of all the
files found. This often makes a subsequent program (such as `squid',
`find', `du' etc.) run faster.
The latest source is at:
http://www.tantalophile.demon.co.uk/treescan/treescan-0.5.tar.gz
Portability
- -----------
Treescan uses GNU Autoconf for configuration, and should be portable to
many unix-like operating systems. It should work even with old
operating systems. I've tried to support anything that GNU Find would
run on.
If you find a system which Treescan doesn't compile on, but GNU Find
does, please report that as a bug.
Efficiency
- ----------
Treescan's strategy is optimised for any filesystem that fits these
assumptions: Inode number = approximate position of inode on disk (or
it's stored in the directory entry), and for directories, inode number =
approximate position of directory on disk. Inodes may be stored
separately from data, but this isn't required.
A fine example of such a filesystem is ext2, the standard Linux
filesystem. On Linux, vfat/msdos also fits this assumption (though
perhaps recent kernel changes changed this).
On some filesystems Treescan may perform badly, because the inode
numbers are really just hash values. Notably the user-space NFS server
used with older Linux kernels might exhibit this problem (I haven't
checked). Kernel NFS servers, which includes most commercial unix NFS
servers and (optionally) recently Linux kernels, should be fine.
The inode-ordering strategy can be disabled using the `-nosort' flag.
In this case Treescan can still be faster than `find' because of other
things it does. For this reason, a good heuristic for deciding when not
to use the inode-ordering strategy is worth adding in future.
(The other things Treescan does are: fewer system calls, avoid directory
name lookups when possible, scan directory inodes in clusters, and avoid
calling stat() on non-directories or even reading the inodes from disk
if the operating system supports the right features. (Linux doesn't
really support d_type yet but I think BSD does)).
There are older systems on which GNU Find may run faster, for the
moment: specifically those without the fchdir() system call. We don't
follow GNU Find's strategy on those systems. The problem will be
addressed in future.
The goal is to provide the same or better level of performance compared
with `find' on all platforms.
Uses
- ----
+ Treescan is handy when you want a list of all the files in a directory
tree. It is sometimes much faster than `find'.
+ `treescan /var/spool/squid -stat' is a very good thing to have in your
Squid startup script, just before starting Squid. Total startup time
for me is 6.7 seconds instead of 2 minutes, the disk does not thrash
noisily, and the system doesn't chug for 2 minutes after booting.
+ Treescan is good to run just before `gendiff' on Linux source trees.
It makes `gendiff' run a lot faster.
Similar gains occur with `find' and `du' and so forth.
Caveats
- -------
- - It's not ready to use for `updatedb' on a large disk yet.
It is slower than `find /' on one of my systems (6.4 gig disk, 200,000
files) but faster on another.
- - Optimised for the ext2 filesystem on Linux.
May not run well with other filesystems or operating systems.
In particular NFS performance may be very bad due to the inode hashing
scheme used by the user-space server, though I haven't tested it.
See efficiency notes above.
- - File names are not output in the same order as `find' nor any other
sensible order. To get `find'-compatible behaviour, pipe the
output through `sort'.
The Itch
- --------
I wrote Treescan to make the web cache Squid start faster. Every time
I booted my computer, Squid would start, and spend the next 2 minutes
thrashing the disk as hard as possible. It was accessing the disk in a
more or less random fashion.
Linux would crawl along for those 2 minutes, and my poor disk would make
the noise that suffering disks make for that time.
I prefer Linux to be lean and fast from the start :-)
I prefer my disk not to be worn out by unnecessary heavy activity :-)
Treescan solves this problem very well: 6 seconds instead of 2 minutes.
Another goal is to make `updatedb' faster. That is the only other
program which thrashes my disk heavily, and it does it every night.
Unfortunately Treescan is not always faster than `find' for this --
the solution is work in progress.
Now I've expanded the goal a little: to be as efficient as a good
implementation of `find' in all reasonable cases. And then to package
it into a library, because lots of programs want to list directories or
get the attributes of many files efficiently.
Work in progress
- ----------------
The scanning strategy still needs a bit of work for the large disk
cases. Specifically, what is best to do when the buffer cache and
dentry cache don't hold everything (Linux terminology)? Thoughts on
this are particularly appreciated.
I detect this by assuming "fd open == inode guaranteed in memory, fd
closed == not guaranteed, always enough buffer cache to hold directory
contents for search". In other words, things are considered to start
going pear shaped when I run out of open directory file descriptors and
have to close some. I consider that the closed inodes may get flushed
from the inode cache at any time after that.
A heuristic is needed to decide when to switch off the inode ordering
strategy, and just use the ordering we got from readdir(). This isn't
as I/O efficient as using the order on a filesystem that it suits (by
far), but is I/O efficient on those it doesn't. We assume the I/O bound
cases are the important ones.
More things are in the TODO list.
License
- -------
Treescan is copyrighted by me, and currently licensed under the GNU
General Public License (GPL). If it looks like becoming a useful
library, I will probably change it to the Lesser GPL (LGPL).
Final notes
-----------
It's not obvious what is the best strategy for handling the cases when
I've run out of file descriptors. Also I want to stimulate some
interest in this lest it turn into rusty old code while I'm busy with
other things. So I decided to release this version to get some
feedback. Please send me some!
I'll be lacking email access for much of the next two weeks -- don't
expect a response during that time, maybe a bit longer.
If this program helps you to spot bottlenecks in your favourite free
kernel, so much the better!
Enjoy,
- -- Jamie Lokier
Jamie Lokier <[EMAIL PROTECTED]>
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From: "Michael J. Hammel" <[EMAIL PROTECTED]>
Subject: XNotesPlus v3.2 - sticky notes program
Date: Thu, 10 Jun 1999 21:40:56 GMT
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XNotesPlus is a sticky notes program with over a dozen
features: email, search text, printing, audio/visual alarms,
date and calendar inserts, categorization by colored
projects, etc. It also includes an interface
to the 3Com Palm Pilot, allowing backups and syncing of
backups, uploading XNotes to the Pilot and downloading
Pilot Memos into XNotes, and a complete interface to the
Pilot Address Book, allowing you to use addresses from
the Pilot to print envelopes and email notes to friends.
XNotesPlus comes with support for both Gtk and Motif/LessTif.
The latest version, 3.2, includes a fully themed interface for those
who like a little pizzazz with their notes! This new version also
includes quite a few bug fixes for both versions of the UI.
XNotesPlus is brought to you by The Graphics Muse,
Michael J. Hammel.
Download: http://www.graphics-muse.org/source/XNotesPlus
Info: http://www.graphics-muse.org/xnotes/xnotes.html
- --
Michael J. Hammel |
The Graphics Muse | I refuse to star in your psychodrama.
[EMAIL PROTECTED] |
http://www.graphics-muse.org
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From: Trevor Johnson <[EMAIL PROTECTED]>
Subject: aumix 1.21 - adjust an audio mixer
Date: Thu, 10 Jun 1999 21:45:06 GMT
=====BEGIN PGP SIGNED MESSAGE=====
I've uploaded aumix 1.21, a program for adjusting an audio mixer from the
console, a terminal, the command line or scripts.
Here are the key changes since version 1.15:
features added:
- - option to specify file for saving and loading settings
- - spec file for Red Hat Linux, with Russian and Ukrainian translations
- - periodic updates to track adjustment of the mixer by other processes
- - options to increment or decrement levels by a specified amount
- - move cursor out of the way so it looks better in an xterm
- - "only" (solo) and "undo" (reverse muting or soloing) features
- - ability to load color schemes from files (samples included)
bugs fixed:
- - namespace conflict with libc 5 on Linux
- - wrong tests for ALSA and NetBSD
- - error messages saying "Success"
- - crash when trying to load non-existent settings file
- - busy waiting eating CPU time
The program is available through its Web page at:
http://www.jpj.net/~trevor/aumix.html
and by FTP from:
ftp://metalab.unc.edu/pub/Linux/apps/sound/mixers/
Please send any feedback to the mailing list:
http://linuxatlax.org/lists/aumix/ or [EMAIL PROTECTED]
__
Trevor Johnson
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From: Dwight Ringdahl <[EMAIL PROTECTED]>
Subject: UseNet Offers Free NewsGroup Access.
Date: Thu, 10 Jun 1999 21:48:37 GMT
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UseNet Server has opened up it doors to the Linux/Open Source community.
We are offering free access to all Linux based news groups on our
commercial servers. To access the servers point your newsreaders to
news4.usenetserver.com and use 'Linux' and 'free' for your login/password.
UseNet appreciates all the help from the community in solving our problems
and wish to give some back. For more info check out our web site at
http://www.usenetserver.com
Dwight Ringdahl
President/CEO
UseNetServer.Com
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------------------------------
From: Wichert Akkerman <[EMAIL PROTECTED]>
Subject: strace 3.99.1 release
Date: Thu, 10 Jun 1999 21:47:08 GMT
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- -----BEGIN PGP SIGNED MESSAGE-----
The second pre-release for strace 4.0 has been released. The new
version number is 3.99.1, and you can get it from the usual places,
which are mentioned below.
Changes since 3.99:
* strace works correctly on Linux sparc now
* strace doesn't segfault on alpha anymore
* compiles and works correctly on solaris
Some issues that should be resolved before strace 4.0 is
released:
* Linux powerpc gets the stat structure wrong
* fstat decoding fails on Linux alpha (might be an alignment/64-bit
problem in sendmail?)
There is now also an strace mailinglist. You can subscribe by sending
an email with the subject "subscribe" to [EMAIL PROTECTED]
You can post to the list by sending mail to [EMAIL PROTECTED]
You can get strace at two locations:
* homepage at http://www.wi.leidenuniv.nl/~wichert/strace/
* CVS archive at :pserver:[EMAIL PROTECTED]:/cvs/strace,
password is empty
Wichert.
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------------------------------
From: SuperNova <[EMAIL PROTECTED]>
Subject: COMMERCIAL: Enterprise Development Suite on Linux
Date: Thu, 10 Jun 1999 21:49:24 GMT
=====BEGIN PGP SIGNED MESSAGE=====
SuperNova Component Developer Enterprise Application Integration Suite
Available on Linux
SuperNova's Component Developer product is available on the tools CD with
the Red Hat 6.0 distribution. Additionally, an even newer version of this
the release is available for free downloading at
http://www.supernova.com/linux
The product contains all tools, with interfaces for C-tree and FoxPro
databases.
SuperNova Component Developer is an interactive development tool for generating
applications in distributed environments for most of the most commonly used
industrial database systems, including (but by no means limited to) Informix,
Ingres, Sybase, FoxPro, dBaseIV, C-tree, Jasmine, SQL Server and Oracle. Use
SuperNova Component Developer to design your application, dragging and dropping
the dialog elements, defining the data dictionary, determining the application
flow, and generating code in SuperNova 4GL.
Applications built with SuperNova Component Developer can run under Java,
X/Motif on UNIX and VMS platforms as well as under Windows (NT, 95, or 98).
Provided the interfaces have been installed, a single application can mix and
match all the databases supported by SuperNova. SuperNova applications can be
run in a client/server environment, whereby portions of the application are
distributed and executed across the network to make optimum use of network
services (note that the networking facilities of the Linux distribution are
only properly configured for running under Red Hat).
The GUI development package provides a toolbox for developing applications
which take full advantage of the features and facilities provided by GUI
environments for managing the Man-Machine Interface. Furthermore, applications
developed with this package will also run without any modification on any other
GUI platform for which SuperNova is available, whether Motif, Windows or Java,
as well as on traditional character-based terminals with the SuperNova
character-based GUI emulation engine.
SuperNova applications may be complete, independent entities, or may be
designed as components, interfacing with other SuperNova or non-SuperNova
components via (D)COM, CORBA, or IIOP. SuperNova also provides a
component interface to SAP RFC's and the SAP Business Objects Repository.
Other middleware interfaces provide gateways to the Internet, allowing
SuperNova to dynamically generate web pages via a CGI interface, to mine the
Internet for data via HTML Data Retrieval, or to send and receive E-mail via
SMTP/POP3 interfaces. SuperNova also provides interfaces to the Tuxedo and
Top End transaction Monitors.
In short, an application developed with SuperNova can:
- - transparently and dynamically be distributed across a network
- - run under any of the environments for which SuperNova engines exist without
recompilation or modification
- - run on any of the hardware platforms for which SuperNova engines exist without
recompilation or modification
- - transparently and simultaneously communicate with more than 20 different
DBMS's by means of a uniform programmer's interface
- - be modified to run on different databases without reprogramming
Additionally, SuperNova GUI applications can easily be integrated in
environments using SuperNova applications designed for character-based displays
running under operating systems including UNIX, MS-DOS, AS400 or VMS.
SuperNova has more than 10 years experience with its Component Developer
product, with over 10,000 licenses world-wide. Much of the R&D development
work on SuperNova Component Developer is, and has been for the last three years,
done on Linux systems.
- --
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------------------------------
From: Jim Gleason <[EMAIL PROTECTED]>
Subject: LOCAL: Perry Metzger/Open Source Firewalling at NYLUG, 6/16 @ 6:30pm
Date: Thu, 10 Jun 1999 21:50:11 GMT
=====BEGIN PGP SIGNED MESSAGE=====
NEW YORK LINUX USERS GROUP - JUNE MEETING
Perry Metzger: Open Source Systems, Firewalls and Network Security
Wed. 6/16/99
6:30-8pm
IBM Building
590 Madison Avenue (at 57th St.)
check in at lobby for badge and room number
As businesses have come to be more and more dependent on the Internet for
their day to day operations, the security of their networks has
become a matter of crucial importance. Mr. Metzger will explain why Open
Source systems are a valuable tool in constructing secure
environments, and why they are almost irreplaceable as a component of
modern firewall systems.
Perry Metzger is a well-known authority in the field of network
communications protocols. He is the President of his own consulting
company, Piermont Information Systems, and is the co-author of several
IETF RFC's dealing with Internet security. He has worked for Bellcore,
IBM, Morgan Stanley and Lehman Brothers, among others, and currently
specializes in Systems Security and Cryptographic Protocols.
____________
Where & When:
With the generous support of IBM, all regular NY-LUG meetings are held at
the main IBM building at 590 Madison Avenue at 57th Street in mid-town
Manhattan every third Wednesday of the month starting at 6:30pm.
_____________
Mailing Lists:
Anyone may subscribe by sending an email message to
[EMAIL PROTECTED] with the following text in the body of
the message: subscribe list-name
* nylug-talk
Talk Mailing List for people to contribute and resolve each other's
technical problems.
* nylug-announce
Announce Mailing List for speaker and installfest announcements.
To post a message to the talk mailing list, address it to
[EMAIL PROTECTED]
________
Contacts:
Jim Gleason, [EMAIL PROTECTED]
Eric Berg, [EMAIL PROTECTED]
_____________
What is NYLUG?
NYLUG is New York's Linux Users Group supporting all things Linux and Open
Source in the greater New York area. Please feel free to contact me if you
have any questions about the NY-LUG.
- -------------------------------------------------------------------------
Jim Gleason VA Linux Systems
email: [EMAIL PROTECTED] http://www.valinuxsystems.com
phone: 718-858-4349 President, New York Linux Users Group
fax: 718-858-4242 http://www.nylug.org
- -------------------------------------------------------------------------
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** FOR YOUR REFERENCE **
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Linux may be obtained via one of these FTP sites:
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End of Linux-Announce Digest
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