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From: Stefan Priebe <s.priebe@profihost.ag>
To: Mark Nelson <mark.nelson@inktank.com>
Cc: Gregory Farnum <greg@inktank.com>,
	"ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: OSD Hardware questions
Date: Thu, 28 Jun 2012 18:00:36 +0200	[thread overview]
Message-ID: <4FEC7FA4.3010307@profihost.ag> (raw)
In-Reply-To: <4FEC6C68.2030307@inktank.com>

Am 28.06.2012 16:38, schrieb Mark Nelson:
> On 06/28/2012 08:21 AM, Stefan Priebe - Profihost AG wrote:
>> While doing sequential writes i see pretty low CPU usage. Random writes
>> is the problem.
>>
>> Stefan
>
> It would be interesting to see where all your CPU time is being spent.

Correct - what do you need?

> What benchmark are you using to do the random writes?
in KVM VM:
export DISK=/dev/vda

fio --filename=$DISK --direct=1 --rw=randwrite --bs=4k --size=200G 
--numjobs=50 --runtime=90 --group_reporting --name=file1

Stefan

      parent reply	other threads:[~2012-06-28 16:00 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-27 13:04 OSD Hardware questions Stefan Priebe - Profihost AG
2012-06-27 13:55 ` Mark Nelson
2012-06-27 14:55   ` Jim Schutt
2012-06-27 15:19     ` Stefan Priebe
2012-06-27 17:23       ` Jim Schutt
2012-06-27 17:54         ` Stefan Priebe
2012-06-27 18:38           ` Jim Schutt
2012-06-27 18:48             ` Stefan Priebe
2012-06-27 19:10               ` Jim Schutt
2012-06-27 19:14                 ` Jim Schutt
2012-06-27 15:53     ` Mark Nelson
2012-06-27 17:59       ` Jim Schutt
2012-06-27 15:13   ` Stefan Priebe
     [not found]     ` <CAPYLRzj916kW=KLy3dMTVPJRoNtPMP_Ejz+YAxRUJ5jZc+HeMg@mail.gmail.com>
2012-06-27 15:28       ` Stefan Priebe
2012-06-27 16:00         ` Mark Nelson
2012-06-28 13:21           ` Stefan Priebe - Profihost AG
2012-06-28 14:38             ` Mark Nelson
2012-06-28 15:18               ` Alexandre DERUMIER
2012-06-28 15:33                 ` Sage Weil
2012-06-28 15:45                   ` Alexandre DERUMIER
2012-06-28 15:48                     ` Jim Schutt
2012-06-28 21:25                   ` Stefan Priebe
2012-06-29 11:37                     ` Mark Nelson
2012-06-29 12:35                       ` Stefan Priebe - Profihost AG
2012-06-28 16:01                 ` Stefan Priebe
2012-06-28 16:00               ` Stefan Priebe [this message]

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