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

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Message-ID: <20070223223112.GJ7920@ca-server1.us.oracle.com>
Date:	Fri, 23 Feb 2007 14:31:12 -0800
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Jens Axboe <jens.axboe@...cle.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>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	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)

On Fri, Feb 23, 2007 at 01:52:47PM +0100, Jens Axboe wrote:
> Results:
> 
> Engine          Depth           Bw (MiB/sec)
> --------------------------------------------
> libaio            1             441
> syslet            1             574
> sync              1             589
> libaio           32             613
> syslet           32             681

	Can we get runs with large I/Os, large I/O depths, and most
importantly tons of processes?  I can absolutely believe that syslets
would compete well with one process on the system.  But with 1000
processes doing 1000s of blocking I/Os, I'd really be interested to see
how that plays out.

Joel

-- 

 Joel's Second Law:

	If a code change requires additional user setup, it is wrong.

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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