linux-kernel - Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)

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Message-ID: <20070226135736.GF3822@kernel.dk>
Date:	Mon, 26 Feb 2007 14:57:36 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Suparna Bhattacharya <suparna@...ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3)


Some more results, using a larger number of processes and io depths. A
repeat of the tests from friday, with added depth 20000 for syslet and
libaio:

Engine          Depth   Processes       Bw (MiB/sec)
----------------------------------------------------
libaio            1         1            602
syslet            1         1            759
sync              1         1            776
libaio           32         1            832
syslet           32         1            898
libaio        20000         1            581
syslet        20000         1            609

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:

Engine          Depth   Processes       Bw (MiB/sec)
----------------------------------------------------
libaio           200       100            1488
syslet           200       100            1714

Results are stable to within approx +/- 10MiB/sec. The syslet case
completes a whole second faster than libaio (~6 vs ~7 seconds). Testing
was done with fio HEAD eb7c8ae27bc301b77490b3586dd5ccab7c95880a, and it
uses the v4 patch series.

Engine          Depth   Processes       Bw (MiB/sec)
----------------------------------------------------
libaio            200       100            1488
syslet            200       100            1714
sync              200       100            1843

-- 
Jens Axboe

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