From: Jens Axboe <jaxboe@fusionio.com>
To: Troels Arvin <troels@arvin.dk>
Cc: fio@vger.kernel.org
Subject: Re: Unaligned AIO/DIO
Date: Thu, 2 Jun 2011 13:51:14 +0200 [thread overview]
Message-ID: <4DE77932.10809@fusionio.com> (raw)
In-Reply-To: <4DE64DC5.3060703@arvin.dk>
On 2011-06-01 16:33, Troels Arvin wrote:
> Hello,
>
> Jens Axboe wrote:
>> The iometer like test
>> case you are using is meant to be used on a raw block device, not on a
>> file system.
>
> OK, but how does one use fio with a raw device? Can you give an example of a job specification file for working with a raw block device?
To take your example:
[global]
bssplit=512/10:1k/5:2k/5:4k/60:8k/2:16k/4:32k/4:64k/10
rw=randrw
rwmixread=70
direct=1
size=10g
ioengine=libaio
iodepth=256
write_bw_log
write_lat_log
numjobs=6
[sda]
filename=/dev/sda
would run the workload in question directly on the raw sda device.
> And can that be done in a way which simulates parallel I/O (several
> processes/threads working simultaneously)?
For the above example, you have 6 processes doing random read/write
patterns with the 70/30 read/write mix and with the block sizes given.
--
Jens Axboe
prev parent reply other threads:[~2011-06-02 11:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-31 18:22 Unaligned AIO/DIO Troels Arvin
2011-06-01 10:46 ` Jens Axboe
2011-06-01 12:51 ` Troels Arvin
2011-06-01 13:17 ` Jens Axboe
2011-06-01 14:33 ` Troels Arvin
2011-06-02 11:51 ` Jens Axboe [this message]
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