From: Jens Axboe <jaxboe@fusionio.com>
To: "N. Harake" <hussein@cscs.ch>
Cc: "fio@vger.kernel.org" <fio@vger.kernel.org>
Subject: Re: memory caching
Date: Tue, 15 Mar 2011 21:56:53 +0100 [thread overview]
Message-ID: <4D7FD295.6020006@fusionio.com> (raw)
In-Reply-To: <8512BC127909424EB483ED236E6AC3C003D6F4@MBX20.d.ethz.ch>
On 2011-03-15 21:54, N. Harake wrote:
>
> Things improved but maybe too much :), I was expecting a 100K IOPS not more
>
> server1:~ # fio --name=job --directory=/lvm --size=1G --filesize=1G --iodepth=128 --iodepth_batch_complete=8 --iodepth_batch_submit=8 --ioengine=libaio --direct=1 --numjobs=64 --bs= 4096 --rw=randwrite --group_reporting
> Jobs: 50 (f=50): [wwwwww_wwwwwww_wwwwwwwwww_wwwwwwwwwww_www_www_ww_www___ww_w__w_w] [98.3% done] [0K/570.8M /s] [0 /143K iops] [eta 00m:02s]
>
> write: io=65536MB, bw=584771KB/s, iops=146192 , runt=114761msec
If you use numjobs=64, you probably don't want 128 for io depth. Not
very realistic, and you'll likely end up running slower than you could.
--
Jens Axboe
next prev parent reply other threads:[~2011-03-15 20:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-15 8:27 memory caching N. Harake
2011-03-15 12:36 ` N. Harake
2011-03-15 20:28 ` Jens Axboe
2011-03-15 20:46 ` N. Harake
2011-03-15 20:55 ` Jens Axboe
2011-03-15 20:54 ` N. Harake
2011-03-15 20:56 ` Jens Axboe [this message]
2011-03-15 20:20 ` Jens Axboe
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