From: Mark Nelson <mark.nelson@inktank.com>
To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Cc: Joao Eduardo Luis <joao.luis@inktank.com>,
"ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: less cores more iops / speed
Date: Thu, 08 Nov 2012 07:19:18 -0600 [thread overview]
Message-ID: <509BB156.5080404@inktank.com> (raw)
In-Reply-To: <509B711D.3070206@profihost.ag>
On 11/08/2012 02:45 AM, Stefan Priebe - Profihost AG wrote:
> Am 08.11.2012 01:59, schrieb Mark Nelson:
>> There's also the context switching overhead. It'd be interesting to
>> know how much the writer processes were shifting around on cores.
> What do you mean by that? I'm talking about the KVM guest not about the
> ceph nodes.
in this case, is fio bouncing around between cores?
>
>> Stefan, what tool were you using to do writes?
> as always: fio ;-)
You could try using numactl to pin fio to a specific core. Also, it may
be interesting to try multiple concurrent fio processes, and then
concurrent fio processes with each pinned.
>
> Stefan
next prev parent reply other threads:[~2012-11-08 13:19 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-07 22:02 less cores more iops / speed Stefan Priebe
2012-11-08 0:00 ` Joao Eduardo Luis
2012-11-08 0:16 ` Openstack - Boot From New Volume Quenten Grasso
2012-11-08 0:59 ` less cores more iops / speed Mark Nelson
2012-11-08 8:45 ` Stefan Priebe - Profihost AG
2012-11-08 8:58 ` Alexandre DERUMIER
2012-11-08 9:02 ` Stefan Priebe - Profihost AG
2012-11-08 9:05 ` Alexandre DERUMIER
2012-11-08 9:28 ` Stefan Priebe - Profihost AG
2012-11-08 13:19 ` Mark Nelson [this message]
2012-11-08 15:14 ` Stefan Priebe - Profihost AG
2012-11-08 15:53 ` Alexandre DERUMIER
2012-11-08 21:52 ` Andrey Korolyov
2012-11-09 8:43 ` Stefan Priebe - Profihost AG
2012-11-08 0:59 ` Mark Nelson
2012-11-08 5:42 ` Dietmar Maurer
2012-11-08 5:49 ` Dietmar Maurer
2012-11-08 6:20 ` Stefan Priebe - Profihost AG
2012-11-08 5:49 ` Stefan Priebe - Profihost AG
2012-11-08 5:54 ` Dietmar Maurer
2012-11-08 6:21 ` Stefan Priebe - Profihost AG
-- strict thread matches above, loose matches on Subject: below --
2012-11-12 15:33 [pve-devel] " Stefan Priebe - Profihost AG
[not found] ` <50A116DC.2020509-2Lf/h1ldwEHR5kwTpVNS9A@public.gmane.org>
2012-11-12 15:39 ` Alexandre DERUMIER
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