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From: Davide Libenzi <>
To: Linux Kernel Mailing List <>
Cc: Ingo Molnar <>,
	Linus Torvalds <>,
	Jens Axboe <>
Subject: Re: AIO, FIO and Threads ...
Date: Tue, 20 Mar 2007 23:54:22 -0700 (PDT)	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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):
> 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:

I dropped the last FIO+GUASI patch here:

And Jens FIO is here:

- Davide

  reply	other threads:[~2007-03-21  6:54 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-21  4:58 AIO, FIO and Threads Davide Libenzi
2007-03-21  6:54 ` Davide Libenzi [this message]
2007-03-21  7:40 ` Jens Axboe
2007-03-21 15:23   ` Davide Libenzi
2007-03-22  6:47     ` Jens Axboe
2007-03-22  2:02   ` Davide Libenzi

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