From: Jens Axboe <axboe@kernel.dk>
To: linux-btrace@vger.kernel.org
Subject: Re: Capturing idle time with blktrace
Date: Wed, 22 Apr 2015 22:51:36 +0000 [thread overview]
Message-ID: <553825F8.5070903@kernel.dk> (raw)
In-Reply-To: <CADAGN7WfwEdxivADLsei2KKVvzybzpFLpHqKMwZEd3TQ4nQ78g@mail.gmail.com>
On 04/22/2015 02:53 PM, Brandon Schwartz wrote:
> And by blkreplay, I meant replay the blktrace with FIO
>
> On Wed, Apr 22, 2015 at 2:52 PM, Brandon Schwartz <schwartz.xn@gmail.com> wrote:
>> Is there an accurate way to capture idle time with blktrace? For
>> example, if I run/trace the following FIO script:
>>
>> [global]
>> direct=1
>> ioengine=libaio
>> readwrite=read
>> blocksizeQ2k
>> filename=/dev/sdd
>>
>> [read]
>> runtime\x10
>> name=read
>>
>> [read2]
>> stonewall=1
>> startdelay@
>> runtime\x10
>> name=read2
>>
>> And attempt to replay it using blkreplay, it will ignore the wait time
>> and simply read for 20seconds instead of read 10s, wait for 40s, read
>> 10s.
replay_no_stall=1
--
Jens Axboe
next prev parent reply other threads:[~2015-04-22 22:51 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-22 20:52 Capturing idle time with blktrace Brandon Schwartz
2015-04-22 20:53 ` Brandon Schwartz
2015-04-22 22:51 ` Jens Axboe [this message]
2015-04-22 23:35 ` Brandon Schwartz
2015-04-23 2:54 ` Alireza Haghdoost
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