From: Ingo Molnar <mingo@elte.hu>
To: Suparna Bhattacharya <suparna@in.ibm.com>
Cc: Jens Axboe <jens.axboe@oracle.com>,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Arjan van de Ven <arjan@infradead.org>,
Christoph Hellwig <hch@infradead.org>,
Andrew Morton <akpm@zip.com.au>,
Alan Cox <alan@lxorguk.ukuu.org.uk>,
Ulrich Drepper <drepper@redhat.com>,
Zach Brown <zach.brown@oracle.com>,
Evgeniy Polyakov <johnpol@2ka.mipt.ru>,
"David S. Miller" <davem@davemloft.net>,
Davide Libenzi <davidel@xmailserver.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)
Date: Mon, 26 Feb 2007 15:18:09 +0100 [thread overview]
Message-ID: <20070226141808.GB24683@elte.hu> (raw)
In-Reply-To: <20070226141315.GA15631@in.ibm.com>
* Suparna Bhattacharya <suparna@in.ibm.com> wrote:
> > syslet still on top. Measuring O_DIRECT reads (of 4kb size) on ramfs
> > with 100 processes each with a depth of 200, reading a per-process
> > private file of 10mb (need to fit in my ram...) 10 times each. IOW,
> > doing 10,000MiB of IO in total:
>
> But, why ramfs ? Don't we want to exercise the case where O_DIRECT
> actually blocks ? Or am I missing something here ?
ramfs is just the easiest way to measure the pure CPU overhead of a
workload without real IO delays (and resulting idle time) getting in the
way. It's certainly not the same thing, but still it's pretty useful
most of the time. I used a different method, loopback block device, and
got similar results. [ Real IO shows similar results as well, but is a
lot more noisy and hence harder to interpret (and thus easier to get
wrong). ]
Ingo
next prev parent reply other threads:[~2007-02-26 14:25 UTC|newest]
Thread overview: 338+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-21 21:13 [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Ingo Molnar
2007-02-21 21:14 ` [patch 01/13] syslets: add async.h include file, kernel-side API definitions Ingo Molnar
2007-02-21 21:15 ` [patch 02/13] syslets: add syslet.h include file, user API/ABI definitions Ingo Molnar
2007-02-21 21:15 ` [patch 03/13] syslets: generic kernel bits Ingo Molnar
2007-02-21 21:15 ` [patch 04/13] syslets: core code Ingo Molnar
2007-02-23 23:08 ` Davide Libenzi
2007-02-24 7:04 ` Ingo Molnar
2007-02-24 21:10 ` Davide Libenzi
2007-02-24 22:08 ` Kyle Moffett
2007-02-24 22:25 ` Davide Libenzi
2007-02-25 7:59 ` Ingo Molnar
2007-02-21 21:15 ` [patch 05/13] syslets: core, documentation Ingo Molnar
2007-02-26 21:32 ` Randy Dunlap
2007-02-27 6:20 ` Ingo Molnar
2007-02-21 21:15 ` [patch 06/13] x86: split FPU state from task state Ingo Molnar
2007-02-21 21:15 ` [patch 07/13] syslets: x86, add create_async_thread() method Ingo Molnar
2007-02-21 21:15 ` [patch 08/13] syslets: x86, add move_user_context() method Ingo Molnar
2007-02-21 23:03 ` Davide Libenzi
2007-02-21 23:20 ` Ingo Molnar
2007-02-22 4:10 ` Davide Libenzi
2007-02-21 21:15 ` [patch 09/13] syslets: x86, mark async unsafe syscalls Ingo Molnar
2007-02-21 21:15 ` [patch 10/13] syslets: x86: enable ASYNC_SUPPORT Ingo Molnar
2007-02-21 21:15 ` [patch 11/13] syslets: x86, wire up the syslet system calls Ingo Molnar
2007-02-21 21:15 ` [patch 12/13] syslets: x86: optimized copy_uatom() Ingo Molnar
2007-02-21 21:16 ` [patch 13/13] syslets: x86: optimized sys_umem_add() Ingo Molnar
2007-02-21 22:46 ` [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Michael K. Edwards
2007-02-21 22:57 ` Ingo Molnar
2007-02-22 0:53 ` Michael K. Edwards
2007-02-22 1:33 ` Michael K. Edwards
2007-02-22 6:51 ` Ingo Molnar
2007-02-22 8:59 ` Michael K. Edwards
2007-02-22 19:52 ` x86 hardware and transputers (Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3) Oleg Verych
2007-02-22 20:45 ` Michael K. Edwards
2007-02-21 23:03 ` [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Ingo Molnar
2007-02-21 23:24 ` Ingo Molnar
2007-02-22 0:55 ` Michael K. Edwards
2007-02-21 23:31 ` Ingo Molnar
2007-02-21 23:46 ` Ulrich Drepper
2007-02-22 7:40 ` Ingo Molnar
2007-02-22 11:31 ` Evgeniy Polyakov
2007-02-22 11:52 ` Arjan van de Ven
2007-02-22 12:39 ` Evgeniy Polyakov
2007-02-22 13:41 ` David Miller
2007-02-22 14:31 ` Ingo Molnar
2007-02-22 14:47 ` David Miller
2007-02-22 15:02 ` Evgeniy Polyakov
2007-02-22 15:15 ` Ingo Molnar
2007-02-22 15:29 ` Ingo Molnar
2007-02-22 17:17 ` David Miller
2007-02-23 11:12 ` Ingo Molnar
2007-02-22 20:13 ` Davide Libenzi
2007-02-22 21:30 ` Zach Brown
2007-02-22 14:59 ` Ingo Molnar
2007-02-22 21:42 ` Michael K. Edwards
2007-02-22 14:53 ` Avi Kivity
2007-02-22 12:59 ` Ingo Molnar
2007-02-22 13:32 ` Evgeniy Polyakov
2007-02-22 19:46 ` Davide Libenzi
2007-02-23 12:15 ` Evgeniy Polyakov
2007-02-23 17:43 ` Davide Libenzi
2007-02-23 18:01 ` Evgeniy Polyakov
2007-02-23 20:43 ` Davide Libenzi
2007-02-23 11:51 ` Ingo Molnar
2007-02-23 12:22 ` Evgeniy Polyakov
2007-02-23 12:41 ` Evgeniy Polyakov
2007-02-25 17:45 ` Ingo Molnar
2007-02-25 18:09 ` Evgeniy Polyakov
2007-02-25 19:04 ` Ingo Molnar
2007-02-25 19:42 ` Evgeniy Polyakov
2007-02-25 20:38 ` Ingo Molnar
2007-02-26 12:39 ` Ingo Molnar
2007-02-26 14:05 ` Evgeniy Polyakov
2007-02-26 14:15 ` Ingo Molnar
2007-02-26 16:55 ` Evgeniy Polyakov
2007-02-26 20:35 ` Ingo Molnar
2007-02-26 22:06 ` Bill Huey
2007-02-27 10:09 ` Evgeniy Polyakov
2007-02-27 17:13 ` Pavel Machek
2007-02-27 2:18 ` Davide Libenzi
2007-02-27 10:13 ` Evgeniy Polyakov
2007-02-27 16:01 ` Davide Libenzi
2007-02-27 16:21 ` Evgeniy Polyakov
2007-02-27 16:58 ` Eric Dumazet
2007-02-27 17:06 ` Evgeniy Polyakov
2007-02-27 19:20 ` Davide Libenzi
2007-02-26 19:47 ` Davide Libenzi
2007-02-25 23:14 ` Michael K. Edwards
2007-02-22 14:17 ` Suparna Bhattacharya
2007-02-22 14:36 ` Ingo Molnar
2007-02-23 14:23 ` Suparna Bhattacharya
2007-02-22 21:24 ` Michael K. Edwards
2007-02-23 0:30 ` Alan
2007-02-23 2:47 ` Michael K. Edwards
2007-02-23 8:31 ` Michael K. Edwards
2007-02-23 10:22 ` Ingo Molnar
2007-02-23 12:37 ` Alan
2007-02-23 23:49 ` Michael K. Edwards
2007-02-24 1:08 ` Alan
2007-02-24 0:51 ` Michael K. Edwards
2007-02-24 2:17 ` Michael K. Edwards
2007-02-24 3:25 ` Michael K. Edwards
2007-02-23 12:17 ` Ingo Molnar
2007-02-24 19:52 ` Michael K. Edwards
2007-02-24 21:04 ` Davide Libenzi
2007-02-24 23:01 ` Michael K. Edwards
2007-02-25 22:44 ` Linus Torvalds
2007-02-26 13:11 ` Ingo Molnar
2007-02-26 17:37 ` Evgeniy Polyakov
2007-02-26 18:19 ` Arjan van de Ven
2007-02-26 18:38 ` Evgeniy Polyakov
2007-02-26 18:56 ` Chris Friesen
2007-02-26 19:20 ` Evgeniy Polyakov
2007-02-26 17:28 ` Evgeniy Polyakov
2007-02-26 17:57 ` Linus Torvalds
2007-02-26 18:32 ` Evgeniy Polyakov
2007-02-26 19:22 ` Linus Torvalds
2007-02-26 19:30 ` Evgeniy Polyakov
2007-02-26 20:04 ` Linus Torvalds
2007-02-27 8:09 ` Evgeniy Polyakov
2007-02-26 19:54 ` Ingo Molnar
2007-02-27 10:28 ` Evgeniy Polyakov
2007-02-27 11:52 ` Theodore Tso
2007-02-27 12:11 ` Evgeniy Polyakov
2007-02-27 12:13 ` Ingo Molnar
2007-02-27 12:40 ` Evgeniy Polyakov
2007-02-28 16:14 ` Pavel Machek
2007-03-01 8:18 ` Evgeniy Polyakov
2007-03-01 9:26 ` Pavel Machek
2007-03-01 9:47 ` Evgeniy Polyakov
2007-03-01 9:54 ` Ingo Molnar
2007-03-01 10:59 ` Evgeniy Polyakov
2007-03-01 11:00 ` Ingo Molnar
2007-03-01 11:16 ` Evgeniy Polyakov
2007-03-01 11:27 ` Ingo Molnar
2007-03-01 11:36 ` Evgeniy Polyakov
2007-03-01 11:41 ` Ingo Molnar
2007-03-01 11:47 ` Ingo Molnar
2007-03-01 12:10 ` Evgeniy Polyakov
2007-03-01 12:43 ` Ingo Molnar
2007-03-01 13:01 ` Evgeniy Polyakov
2007-03-01 13:11 ` Ingo Molnar
2007-03-01 13:30 ` Evgeniy Polyakov
2007-03-01 14:19 ` Eric Dumazet
2007-03-01 14:16 ` Ingo Molnar
2007-03-01 14:31 ` Eric Dumazet
2007-03-01 14:27 ` Ingo Molnar
2007-03-01 14:54 ` Evgeniy Polyakov
2007-03-01 15:09 ` Ingo Molnar
2007-03-01 15:36 ` Evgeniy Polyakov
2007-03-02 10:57 ` Ingo Molnar
2007-03-02 11:48 ` Evgeniy Polyakov
2007-03-02 17:32 ` Davide Libenzi
2007-03-02 19:39 ` Ingo Molnar
2007-03-02 20:18 ` Davide Libenzi
2007-03-02 20:29 ` Ingo Molnar
2007-03-02 20:53 ` Davide Libenzi
2007-03-02 21:21 ` Michael K. Edwards
2007-03-02 21:43 ` Nicholas Miell
2007-03-03 0:52 ` Davide Libenzi
2007-03-03 1:36 ` Nicholas Miell
2007-03-03 1:48 ` Benjamin LaHaise
2007-03-03 2:19 ` Davide Libenzi
2007-03-03 7:19 ` Ingo Molnar
2007-03-03 7:20 ` Ingo Molnar
2007-03-03 9:02 ` Davide Libenzi
2007-03-01 19:31 ` Davide Libenzi
2007-03-02 8:10 ` Evgeniy Polyakov
2007-03-02 17:13 ` Davide Libenzi
2007-03-02 19:13 ` Davide Libenzi
2007-03-03 10:06 ` Evgeniy Polyakov
2007-03-03 18:46 ` Davide Libenzi
2007-03-03 20:31 ` Evgeniy Polyakov
2007-03-03 21:57 ` Davide Libenzi
2007-03-03 22:10 ` Davide Libenzi
2007-03-04 16:23 ` Kirk Kuchov
2007-03-04 17:46 ` Kyle Moffett
2007-03-05 5:23 ` Michael K. Edwards
2007-03-04 21:17 ` Davide Libenzi
2007-03-04 22:49 ` Kirk Kuchov
2007-03-04 22:57 ` Davide Libenzi
2007-03-05 4:46 ` Magnus Naeslund(k)
2007-03-06 8:19 ` Pavel Machek
2007-03-07 12:02 ` Kirk Kuchov
2007-03-07 17:26 ` Linus Torvalds
2007-03-07 17:39 ` Ingo Molnar
2007-03-07 18:21 ` Kirk Kuchov
2007-03-07 18:24 ` Jens Axboe
2007-03-07 18:32 ` Evgeniy Polyakov
2007-03-01 12:01 ` Evgeniy Polyakov
2007-03-01 11:14 ` Eric Dumazet
2007-03-01 11:20 ` Evgeniy Polyakov
2007-03-01 11:28 ` Eric Dumazet
2007-03-01 11:47 ` Evgeniy Polyakov
2007-03-01 13:12 ` Eric Dumazet
2007-03-01 14:43 ` Evgeniy Polyakov
2007-03-01 14:47 ` Ingo Molnar
2007-03-01 15:23 ` Evgeniy Polyakov
2007-03-01 15:32 ` Eric Dumazet
2007-03-01 15:41 ` Eric Dumazet
2007-03-01 15:51 ` Evgeniy Polyakov
2007-03-01 15:47 ` Evgeniy Polyakov
2007-03-01 19:47 ` Davide Libenzi
2007-03-01 14:57 ` Evgeniy Polyakov
2007-03-01 12:19 ` Evgeniy Polyakov
2007-03-01 12:34 ` Ingo Molnar
2007-03-01 13:26 ` Evgeniy Polyakov
2007-03-01 13:32 ` Ingo Molnar
2007-03-01 14:24 ` Evgeniy Polyakov
2007-03-01 16:56 ` David Lang
2007-03-01 17:56 ` Evgeniy Polyakov
2007-03-01 18:41 ` David Lang
2007-03-01 19:19 ` Davide Libenzi
2007-03-01 10:11 ` Pavel Machek
2007-03-01 10:19 ` Ingo Molnar
2007-03-01 11:18 ` Evgeniy Polyakov
2007-03-02 10:27 ` Pavel Machek
2007-03-02 10:37 ` Evgeniy Polyakov
2007-03-02 10:56 ` Ingo Molnar
2007-03-02 11:08 ` Evgeniy Polyakov
2007-03-02 17:28 ` Davide Libenzi
2007-03-03 10:27 ` Evgeniy Polyakov
2007-03-01 19:24 ` Johann Borck
2007-03-01 19:37 ` David Lang
2007-03-01 20:34 ` Johann Borck
2007-02-27 12:34 ` Ingo Molnar
2007-02-27 13:14 ` Evgeniy Polyakov
2007-02-27 13:32 ` Avi Kivity
2007-02-28 3:03 ` Michael K. Edwards
2007-02-28 8:02 ` Evgeniy Polyakov
2007-02-28 17:01 ` Michael K. Edwards
2007-03-05 2:16 ` Discussing LKML community [OT from the Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3] Oleg Verych
2007-02-28 16:38 ` [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Phillip Susi
2007-02-22 19:38 ` Davide Libenzi
2007-02-28 9:45 ` Ingo Molnar
2007-02-28 16:17 ` Davide Libenzi
2007-02-28 16:42 ` Linus Torvalds
2007-02-28 17:26 ` Ingo Molnar
2007-02-28 18:22 ` Davide Libenzi
2007-02-28 18:42 ` Linus Torvalds
2007-02-28 18:50 ` Davide Libenzi
2007-02-28 19:03 ` Chris Friesen
2007-02-28 19:42 ` Davide Libenzi
2007-03-01 8:38 ` Evgeniy Polyakov
2007-03-01 9:28 ` Evgeniy Polyakov
2007-02-28 23:12 ` Ingo Molnar
2007-03-01 1:33 ` Andrea Arcangeli
2007-03-01 9:15 ` Evgeniy Polyakov
2007-03-01 21:27 ` Linus Torvalds
2007-02-28 20:21 ` Ingo Molnar
2007-02-28 21:09 ` Davide Libenzi
2007-02-28 21:23 ` Ingo Molnar
2007-02-28 21:46 ` Davide Libenzi
2007-02-28 22:22 ` Ingo Molnar
2007-02-28 22:47 ` Davide Libenzi
2007-02-22 21:23 ` Zach Brown
2007-02-22 21:32 ` Benjamin LaHaise
2007-02-22 21:44 ` Zach Brown
2007-02-22 1:04 ` Michael K. Edwards
2007-02-22 7:00 ` Ingo Molnar
2007-02-22 9:29 ` Michael K. Edwards
2007-02-22 10:01 ` Suparna Bhattacharya
2007-02-22 11:20 ` Ingo Molnar
2007-02-23 12:52 ` A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3) Jens Axboe
2007-02-23 13:55 ` Suparna Bhattacharya
2007-02-23 14:58 ` Ingo Molnar
2007-02-23 15:15 ` Suparna Bhattacharya
2007-02-23 16:25 ` Jens Axboe
2007-02-23 17:13 ` Suparna Bhattacharya
2007-02-23 18:35 ` Jens Axboe
2007-02-26 13:57 ` Jens Axboe
2007-02-26 14:13 ` Suparna Bhattacharya
2007-02-26 14:18 ` Ingo Molnar [this message]
2007-02-26 14:45 ` Jens Axboe
2007-02-27 4:33 ` Suparna Bhattacharya
2007-02-27 9:42 ` Jens Axboe
2007-02-27 11:12 ` Evgeniy Polyakov
2007-02-27 11:29 ` Jens Axboe
2007-02-27 12:19 ` Evgeniy Polyakov
2007-02-27 18:45 ` Jens Axboe
2007-02-27 19:08 ` Evgeniy Polyakov
2007-02-27 19:25 ` Jens Axboe
2007-02-27 12:39 ` Suparna Bhattacharya
2007-02-28 8:31 ` Jens Axboe
2007-02-28 8:38 ` Ingo Molnar
2007-02-28 9:07 ` Jens Axboe
2007-02-27 13:54 ` Avi Kivity
2007-02-27 15:25 ` Ingo Molnar
2007-02-27 16:15 ` Avi Kivity
2007-02-27 16:16 ` Ingo Molnar
2007-02-27 16:26 ` Avi Kivity
2007-02-27 18:49 ` Jens Axboe
2007-02-26 21:40 ` Davide Libenzi
2007-02-23 16:59 ` Ingo Molnar
2007-02-23 22:31 ` Joel Becker
2007-02-24 12:18 ` Jens Axboe
2007-02-24 7:41 ` [patchset] Syslets/threadlets, generic AIO support, v4 Ingo Molnar
2007-02-24 18:34 ` [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Evgeniy Polyakov
2007-02-25 17:23 ` Ingo Molnar
2007-02-25 17:44 ` Evgeniy Polyakov
2007-02-25 17:54 ` Ingo Molnar
2007-02-25 18:21 ` Evgeniy Polyakov
2007-02-25 18:22 ` Ingo Molnar
2007-02-25 18:37 ` Evgeniy Polyakov
2007-02-25 18:34 ` Ingo Molnar
2007-02-25 20:01 ` Frederik Deweerdt
2007-02-25 19:21 ` Ingo Molnar
[not found] ` <20070225194645.GB1353@2ka.mipt.ru>
[not found] ` <20070225195308.GC15681@elte.hu>
[not found] ` <Pine.LNX.4.64.0702251232350.6011@alien.or.mcafeemobile.com>
2007-02-25 21:34 ` threadlets as 'naive pool of threads', epoll, some measurements Ingo Molnar
2007-02-26 10:45 ` Ingo Molnar
2007-02-26 11:48 ` Ingo Molnar
2007-02-26 12:25 ` Evgeniy Polyakov
2007-02-26 12:50 ` Ingo Molnar
2007-02-26 14:32 ` Evgeniy Polyakov
2007-02-26 20:23 ` Ingo Molnar
2007-02-27 8:16 ` Evgeniy Polyakov
2007-02-27 8:27 ` Ingo Molnar
2007-02-27 10:37 ` Evgeniy Polyakov
2007-02-27 12:15 ` Ingo Molnar
2007-02-27 12:22 ` Evgeniy Polyakov
2007-02-26 21:22 ` Davide Libenzi
2007-02-26 8:16 ` [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Ingo Molnar
2007-02-26 9:25 ` Evgeniy Polyakov
2007-02-26 9:55 ` Ingo Molnar
2007-02-26 10:31 ` Ingo Molnar
2007-02-26 10:43 ` Evgeniy Polyakov
2007-02-26 20:02 ` Davide Libenzi
2007-02-26 10:33 ` Evgeniy Polyakov
2007-02-26 10:35 ` Ingo Molnar
2007-02-26 10:47 ` Evgeniy Polyakov
2007-02-26 12:51 ` Ingo Molnar
2007-02-26 16:46 ` Evgeniy Polyakov
2007-02-27 6:24 ` Ingo Molnar
2007-02-27 10:41 ` Evgeniy Polyakov
2007-02-27 10:49 ` Ingo Molnar
2007-02-25 18:25 ` Evgeniy Polyakov
2007-02-25 18:24 ` Ingo Molnar
2007-02-25 14:33 ` Threadlet/syslet v4 bug report Evgeniy Polyakov
2007-02-25 15:24 ` Evgeniy Polyakov
2007-02-27 14:03 A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3) Indan Zupancic
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