linux-kernel - Re: AIO, FIO and Threads ...

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Message-ID: <Pine.LNX.4.64.0703202350280.28960@alien.or.mcafeemobile.com>
Date:	Tue, 20 Mar 2007 23:54:22 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: AIO, FIO and Threads ...

On Tue, 20 Mar 2007, Davide Libenzi wrote:

> 
> I was looking at Jens FIO stuff, and I decided to cook a quick patch for 
> FIO to support GUASI (Generic Userspace Asyncronous Syscall Interface):
> 
> http://www.xmailserver.org/guasi-lib.html
> 
> I then ran a few tests on my Dual Opteron 252 with SATA drives (sata_nv) 
> and 8GB of RAM.
> Mind that I'm not FIO expert, like at all, but I got some interesting 
> results when comparing GUASI with libaio at 8/1000/10000 depths.
> If I read those result correctly (Jens may help), GUASI output is more 
> then double the libaio one.
> Lots of context switches, yes. But the throughput looks like 2+ times.
> Can someone try to repeat the measures and/or spot the error?
> Or tell me which other tests to run?
> This is kinda a suprise for me ...

Tests with block sizes bigger than 4KB bring libaio performance close to 
GUASI, but not quite:

http://www.xmailserver.org/guasi-libaio-fio-results-1.txt

I dropped the last FIO+GUASI patch here:

http://www.xmailserver.org/fio-guasi-0.5.diff

And Jens FIO is here:

http://brick.kernel.dk/snaps/



- Davide


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