From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: extreme ceph-osd cpu load for rand. 4k write Date: Thu, 08 Nov 2012 16:45:54 +0100 Message-ID: <509BD3B2.1040001@profihost.ag> References: <509AC772.5010606@profihost.ag> <509BC878.3090804@profihost.ag> <509BC95F.5090904@inktank.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.profihost.ag ([85.158.179.208]:54217 "EHLO mail.profihost.ag" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751323Ab2KHPqD (ORCPT ); Thu, 8 Nov 2012 10:46:03 -0500 In-Reply-To: <509BC95F.5090904@inktank.com> Sender: ceph-devel-owner@vger.kernel.org List-ID: To: Mark Nelson Cc: "ceph-devel@vger.kernel.org" Am 08.11.2012 16:01, schrieb Mark Nelson: > Hi Stefan, > > You might want to try running sysprof or perf while the OSDs are running > during the tests and see where CPU time is being spent. Also, how are > you determining how much CPU usage is being used? Hi Mark, have a 300MB perf.data file and no idea what todo next ;-) Stefan