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From: <ognen@gene.pbi.nrc.ca>
To: <linux-kernel@vger.kernel.org>
Subject: threading question
Date: Tue, 12 Jun 2001 12:24:04 -0600 (CST)	[thread overview]
Message-ID: <Pine.LNX.4.30.0106121213570.24593-100000@gene.pbi.nrc.ca> (raw)

Hello,

I am a summer student implementing a multi-threaded version of a very
popular bioinformatics tool. So far it compiles and runs without problems
(as far as I can tell ;) on Linux 2.2.x, Sun Solaris, SGI IRIX and Compaq
OSF/1 running on Alpha. I have ran a lot of timing tests compared to the
sequential version of the tool on all of these machines (most of them are
dual-CPU, although I am also running tests on 12-CPU Solaris and 108 CPU
SGI IRIX). On dual-CPU machines the speedups are as follows: my version
is 1.88 faster than the sequential one on IRIX, 1.81 times on Solaris,
1.8 times on OSF/1, 1.43 times on Linux 2.2.x and 1.52 times on Linux 2.4
kernel. Why are the numbers on Linux machines so much lower? It is the
same multi-threaded code, I am not using any tricks, the code basically
uses PTHREAD_CREATE_DETACHED and PTHREAD_SCOPE_SYSTEM and the thread stack
size is set to 8K (but the numbers are the same with larger/smaller stack
sizes).

Is there anything I am missing? Is this to be expected due to Linux way of
handling threads (clone call)? I am just trying to explain the numbers and
nothing else comes to mind....

Best regards,
Ognen Duzlevski
-- 
ognen@gene.pbi.nrc.ca
Plant Biotechnology Institute
National Research Council of Canada
Bioinformatics team


             reply	other threads:[~2001-06-12 18:25 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-06-12 18:24 ognen [this message]
2001-06-12 18:39 ` Davide Libenzi
2001-06-12 18:57 ` from dmesg: kernel BUG at inode.c:486 Olivier Sessink
2001-06-12 18:58 ` threading question Christoph Hellwig
2001-06-12 19:07   ` ognen
2001-06-12 19:15     ` Kip Macy
2001-06-12 19:29       ` Christoph Hellwig
2001-06-12 19:15     ` Christoph Hellwig
2001-06-13 12:20     ` Kurt Garloff
2001-06-13 13:35       ` J . A . Magallon
2001-06-13 14:17         ` Philips
2001-06-13 15:06           ` ognen
2001-06-12 21:44   ` Davide Libenzi
2001-06-12 21:48     ` ognen
2001-06-14 18:15       ` Alan Cox
2001-06-14 22:42         ` threading question (results after thread pooling) ognen
2001-06-14 23:00           ` Mike Castle
2001-06-12 21:58     ` threading question Albert D. Cahalan
2001-06-12 23:48       ` J . A . Magallon
2001-06-12 19:06 ` Kip Macy
2001-06-12 19:14   ` Alexander Viro
2001-06-12 19:25     ` Russell Leighton
2001-06-12 23:27       ` Mike Castle
2001-06-13 17:31   ` bert hubert
2001-06-14  6:45     ` Helge Hafting
2001-06-14 18:28   ` Alan Cox
2001-06-14 19:01     ` bert hubert
2001-06-14 19:22       ` Russell Leighton
2001-06-15 11:29       ` Anil Kumar
2001-06-14 23:05     ` J . A . Magallon
2001-06-16 14:16     ` Michael Rothwell
2001-06-16 15:19       ` Alan Cox
2001-06-16 18:33         ` Russell Leighton
2001-06-16 19:06         ` Michael Rothwell
2001-06-16 21:30           ` Coroutines [was Re: threading question] Russell Leighton
2001-06-12 22:41 ` threading question Pavel Machek
2001-06-13 19:05 Hubertus Franke
     [not found] <fa.f6da6av.agod3u@ifi.uio.no>
     [not found] ` <fa.e54jbkv.kg4r99@ifi.uio.no>
2001-06-16 22:22   ` Dan Maas

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