From: Russ Cox <rsc@swtch.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
Subject: Re: [9fans] Barrelfish
Date: Wed, 21 Oct 2009 09:11:10 -0700 [thread overview]
Message-ID: <dd6fe68a0910210911x354681bdi143ac8be2de30fb0@mail.gmail.com> (raw)
In-Reply-To: <20091021154323.GA10118@nipl.net>
> Can you give one example of a slow task that you think cannot benefit much from
> parallel processing?
Rebuilding a venti index is almost entirely I/O bound.
You can have as many cores as you want and they
will all be sitting idle waiting for the disks. Parallel
processing helps only to the extent that you can run
the disks in parallel, and they're not multiplying quite
as fast as processor cores.
> Perhaps you have a couple of videos to recode? Then you can achieve
> close to 100% utilization.
http://www.dilbert.com/strips/comic/2008-12-13/
Russ
next prev parent reply other threads:[~2009-10-21 16:11 UTC|newest]
Thread overview: 90+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <<20091015105328.GA18947@nipl.net>
2009-10-15 13:27 ` erik quanstrom
2009-10-15 13:40 ` Richard Miller
2009-10-16 17:20 ` Sam Watkins
2009-10-16 18:18 ` Latchesar Ionkov
2009-10-19 15:26 ` Sam Watkins
2009-10-19 15:33 ` andrey mirtchovski
2009-10-19 15:50 ` ron minnich
2009-10-16 21:17 ` Jason Catena
2009-10-17 20:58 ` Dave Eckhardt
2009-10-18 2:09 ` Jason Catena
2009-10-18 16:02 ` Dave Eckhardt
2009-10-17 18:45 ` Eris Discordia
2009-10-17 21:07 ` Steve Simon
2009-10-17 21:18 ` Eric Van Hensbergen
2009-10-18 8:48 ` Eris Discordia
2009-10-18 8:44 ` Eris Discordia
2009-10-19 15:57 ` Sam Watkins
2009-10-19 16:03 ` ron minnich
2009-10-19 16:46 ` Russ Cox
2009-10-20 2:16 ` matt
2009-10-20 9:15 ` Steve Simon
2009-10-21 15:43 ` Sam Watkins
2009-10-21 16:11 ` Russ Cox [this message]
2009-10-21 16:37 ` Sam Watkins
2009-10-21 18:01 ` ron minnich
2009-10-28 15:37 ` matt
[not found] ` <A90043D02D52B2CBF2804FA4@192.168.1.2>
2009-10-18 0:06 ` ron minnich
2009-10-18 0:54 ` Roman Shaposhnik
[not found] <<4ADD147A.4090801@maht0x0r.net>
2009-10-20 2:11 ` erik quanstrom
2009-10-20 2:33 ` matt
[not found] <<20091019182352.GA1688@polynum.com>
2009-10-19 18:48 ` erik quanstrom
[not found] <<4ADC7439.3060502@maht0x0r.net>
2009-10-19 16:13 ` erik quanstrom
2009-10-19 18:23 ` tlaronde
2009-10-20 1:38 ` matt
2009-10-20 1:58 ` Eris Discordia
2009-10-20 2:17 ` matt
[not found] <<20091019155738.GB13857@nipl.net>
2009-10-19 16:05 ` erik quanstrom
2009-10-19 16:34 ` Sam Watkins
2009-10-19 17:30 ` ron minnich
2009-10-19 17:57 ` W B Hacker
2009-10-19 18:14 ` David Leimbach
[not found] <<20091018031508.717CE5B30@mail.bitblocks.com>
2009-10-19 13:44 ` erik quanstrom
2009-10-19 14:36 ` David Leimbach
[not found] <<d50d7d460910161417w45b5c675p8740315aaf6861f@mail.gmail.com>
2009-10-16 22:25 ` erik quanstrom
[not found] <<20091016172030.GB3135@nipl.net>
2009-10-16 18:34 ` erik quanstrom
[not found] <<3e1162e60910150805q2ea3f682w688299a39274051c@mail.gmail.com>
2009-10-15 15:28 ` erik quanstrom
[not found] <<4AD70EE9.1010208@conducive.org>
2009-10-15 13:52 ` erik quanstrom
[not found] <<207092dc429fe476c2046d537aeaa400@hamnavoe.com>
2009-10-15 13:52 ` erik quanstrom
2009-10-15 15:07 ` David Leimbach
2009-10-15 15:21 ` roger peppe
2009-10-16 17:21 ` Sam Watkins
2009-10-16 23:39 ` Nick LaForge
2009-10-18 1:12 ` Roman Shaposhnik
2009-10-19 14:14 ` matt
2009-10-19 16:00 ` Sam Watkins
2009-10-14 19:09 Tim Newsham
2009-10-14 19:54 ` Roman Shaposhnik
2009-10-14 21:21 ` Tim Newsham
2009-10-14 21:33 ` Lyndon Nerenberg (VE6BBM/VE7TFX)
2009-10-14 21:42 ` Noah Evans
2009-10-14 21:45 ` erik quanstrom
2009-10-14 21:57 ` Noah Evans
2009-10-14 22:10 ` Eric Van Hensbergen
2009-10-14 22:21 ` Noah Evans
2009-10-15 1:03 ` David Leimbach
2009-10-15 1:50 ` Roman Shaposhnik
2009-10-15 2:12 ` Eric Van Hensbergen
2009-10-15 10:53 ` Sam Watkins
2009-10-15 11:50 ` Richard Miller
2009-10-15 12:00 ` W B Hacker
2009-10-16 17:03 ` Sam Watkins
2009-10-16 18:17 ` ron minnich
2009-10-16 18:39 ` Wes Kussmaul
2009-10-17 12:42 ` Roman Shaposhnik
2009-10-15 11:56 ` Josh Wood
2009-10-15 13:11 ` hiro
2009-10-15 15:05 ` David Leimbach
2009-10-18 1:15 ` Roman Shaposhnik
2009-10-18 3:15 ` Bakul Shah
[not found] ` <e763acc10910180606q1312ff7cw9a465d6af39c0fbe@mail.gmail.com>
2009-10-18 13:22 ` Roman Shaposhnik
2009-10-18 19:18 ` Bakul Shah
2009-10-18 20:12 ` ron minnich
2009-10-14 21:36 ` Eric Van Hensbergen
2009-10-15 2:05 ` Roman Shaposhnik
2009-10-15 2:17 ` Eric Van Hensbergen
2009-10-15 3:32 ` Tim Newsham
2009-10-15 3:59 ` Eric Van Hensbergen
2009-10-15 17:39 ` Tim Newsham
2009-10-15 18:28 ` Christopher Nielsen
2009-10-15 18:55 ` W B Hacker
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