From: Andy Isaacson <adi@hexapodia.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Bill Davidsen <davidsen@tmr.com>, Larry McVoy <lm@bitmover.com>,
Peter Waechtler <pwaechtler@mac.com>,
linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>
Subject: Re: [ANNOUNCE] Native POSIX Thread Library 0.1
Date: Mon, 23 Sep 2002 19:03:06 -0500 [thread overview]
Message-ID: <20020923190306.D13340@hexapodia.org> (raw)
In-Reply-To: <Pine.LNX.4.44.0209232218320.2118-100000@localhost.localdomain>; from mingo@elte.hu on Mon, Sep 23, 2002 at 10:32:00PM +0200
On Mon, Sep 23, 2002 at 10:32:00PM +0200, Ingo Molnar wrote:
> On Mon, 23 Sep 2002, Bill Davidsen wrote:
> > The programs which benefit from N:M are exactly those which don't behave
> > the way you describe. [...]
>
> 90% of the programs that matter behave exactly like Larry has described.
> IO is the main source of blocking. Go and profile a busy webserver or
> mailserver or database server yourself if you dont believe it.
There are heavily-threaded programs out there that do not behave this
way, and for which a N:M thread model is completely appropriate. For
example, simulation codes in operations research are most naturally
implemented as one thread per object being simulated, with virtually no
IO outside the simulation. The vast majority of the computation time in
such a simulation is spent doing small amounts of work local to the
thread, then sending small messages to another thread via a FIFO, then
going to sleep waiting for more work.
Of course this can be (and frequently is) implemented such that there is
not one Pthreads thread per object; given simulation environments with 1
million objects, and the current crappy state of Pthreads
implementations, the researchers have no choice.
-andy
next prev parent reply other threads:[~2002-09-23 23:57 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-22 18:55 [ANNOUNCE] Native POSIX Thread Library 0.1 Peter Waechtler
2002-09-22 21:32 ` Larry McVoy
2002-09-23 10:05 ` Bill Davidsen
2002-09-23 11:55 ` Peter Waechtler
2002-09-23 19:14 ` Bill Davidsen
2002-09-29 23:26 ` Buddy Lumpkin
2002-09-30 14:54 ` Corey Minyard
2002-09-23 15:30 ` Larry McVoy
2002-09-23 19:44 ` Olivier Galibert
2002-09-23 19:48 ` Bill Davidsen
2002-09-23 20:32 ` Ingo Molnar
2002-09-24 0:03 ` Andy Isaacson [this message]
2002-09-24 0:10 ` Jeff Garzik
2002-09-24 0:14 ` Andy Isaacson
2002-09-24 5:53 ` Ingo Molnar
2002-09-24 20:34 ` David Schwartz
2002-09-24 7:12 ` Thunder from the hill
2002-09-24 7:30 ` Ingo Molnar
2002-09-23 22:35 ` Mark Mielke
2002-09-23 19:59 ` Peter Waechtler
2002-09-23 20:36 ` Ingo Molnar
2002-09-23 21:08 ` Peter Wächtler
2002-09-23 22:44 ` Mark Mielke
2002-09-23 23:01 ` Bill Huey
2002-09-23 23:11 ` Mark Mielke
2002-09-24 0:21 ` Bill Huey
2002-09-24 3:20 ` Mark Mielke
2002-09-23 23:57 ` Andy Isaacson
2002-09-24 6:32 ` 1:1 threading vs. scheduler activations (was: Re: [ANNOUNCE] Native POSIX Thread Library 0.1) Ingo Molnar
2002-09-25 3:08 ` Bill Huey
2002-09-24 18:10 ` [ANNOUNCE] Native POSIX Thread Library 0.1 Christoph Hellwig
2002-09-23 21:32 ` Bill Huey
2002-09-23 21:41 ` dean gaudet
2002-09-23 22:10 ` Bill Huey
2002-09-23 22:56 ` Mark Mielke
2002-09-24 10:02 ` Nikita Danilov
2002-09-23 21:22 ` Bill Huey
2002-09-23 21:03 ` Bill Huey
2002-09-24 12:03 ` Michael Sinz
2002-09-24 13:40 ` Peter Svensson
2002-09-24 14:20 ` Michael Sinz
2002-09-24 14:50 ` Offtopic: (was Re: [ANNOUNCE] Native POSIX Thread Library 0.1) Peter Svensson
2002-09-24 15:19 ` Mark Veltzer
2002-09-24 17:29 ` Rik van Riel
2002-09-25 18:57 ` Mark Mielke
2002-09-25 19:04 ` Rik van Riel
2002-09-25 19:29 ` Mark Veltzer
2002-09-25 19:23 ` Rik van Riel
2002-09-24 16:31 ` Rik van Riel
2002-09-24 18:49 ` Michael Sinz
2002-09-24 19:12 ` PATCH: per user fair scheduler 2.4.19 (cleaned up, thanks hch) (was: Re: Offtopic: (was Re: [ANNOUNCE] Native POSIX Thread Library 0.1)) Rik van Riel
2002-09-24 20:19 ` [ANNOUNCE] Native POSIX Thread Library 0.1 David Schwartz
2002-09-24 21:10 ` Chris Friesen
2002-09-24 21:22 ` Rik van Riel
2002-09-24 21:35 ` Roberto Peon
2002-09-24 21:35 ` Chris Friesen
2002-09-25 19:02 ` David Schwartz
2002-09-24 23:16 ` Peter Waechtler
2002-09-24 23:23 ` Rik van Riel
2002-09-25 19:05 ` David Schwartz
[not found] <987738530@toto.iv>
2002-09-24 2:48 ` Peter Chubb
2002-09-24 3:37 ` Mark Mielke
-- strict thread matches above, loose matches on Subject: below --
2002-09-23 16:36 Matthias Urlichs
2002-09-20 7:46 Joerg Pommnitz
2002-09-20 0:41 Ulrich Drepper
2002-09-20 0:51 ` William Lee Irwin III
2002-09-20 1:35 ` Ulrich Drepper
2002-09-20 1:42 ` William Lee Irwin III
2002-09-20 1:56 ` Larry McVoy
2002-09-20 2:01 ` Rik van Riel
2002-09-20 2:15 ` Benjamin LaHaise
2002-09-20 2:40 ` Dave Hansen
2002-09-20 2:47 ` William Lee Irwin III
2002-09-20 2:17 ` Larry McVoy
2002-09-20 2:24 ` Rik van Riel
2002-09-20 2:32 ` Ulrich Drepper
2002-09-20 6:01 ` Linus Torvalds
2002-09-20 8:02 ` Ingo Molnar
2002-09-20 2:23 ` Anton Blanchard
2002-09-20 9:53 ` Padraig Brady
2002-09-20 13:28 ` Robert Love
2002-09-20 16:01 ` Bill Davidsen
2002-09-20 9:54 ` Adrian Bunk
2002-09-20 10:53 ` Ingo Molnar
2002-09-20 19:04 ` Ulrich Drepper
2002-09-20 23:06 ` J.A. Magallon
2002-09-20 23:33 ` Ulrich Drepper
2002-09-20 23:42 ` J.A. Magallon
2002-09-20 10:20 ` Bill Huey
2002-09-20 10:47 ` Ingo Molnar
2002-09-20 12:06 ` Bill Huey
2002-09-20 16:20 ` Ingo Molnar
2002-09-20 21:50 ` Bill Huey
2002-09-20 22:30 ` dean gaudet
2002-09-20 23:11 ` Bill Huey
2002-09-21 3:38 ` dean gaudet
2002-09-21 4:01 ` Bill Huey
2002-09-21 5:06 ` Ingo Molnar
2002-09-20 23:45 ` Bill Huey
2002-09-21 4:58 ` Ingo Molnar
2002-09-22 2:51 ` Bill Huey
2002-09-21 4:48 ` Ingo Molnar
2002-09-22 1:38 ` Bill Huey
2002-09-22 13:38 ` Bill Davidsen
2002-09-22 18:41 ` Eric W. Biederman
2002-09-22 22:13 ` dean gaudet
2002-09-26 17:21 ` Alan Cox
2002-09-23 0:11 ` Bill Huey
2002-09-24 16:07 ` Eric W. Biederman
2002-09-24 23:21 ` Bill Huey
2002-09-25 3:06 ` Eric W. Biederman
2002-09-23 21:12 ` Bill Huey
2002-09-20 10:35 ` Luca Barbieri
2002-09-20 11:19 ` Ingo Molnar
2002-09-20 18:40 ` Roland McGrath
2002-09-20 21:21 ` Luca Barbieri
2002-09-20 12:37 ` jlnance
2002-09-20 16:42 ` Ingo Molnar
2002-09-24 0:40 ` Rusty Russell
2002-09-24 5:47 ` Ingo Molnar
2002-09-24 6:15 ` Rusty Russell
2002-09-20 15:43 ` Bill Davidsen
2002-09-20 16:15 ` Jakub Jelinek
2002-09-20 17:16 ` Bill Davidsen
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