From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from host-181-75-169-83.static.internet-fr.net ([83.169.75.181]:52271 "EHLO seanodes.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753535AbYK0QYI (ORCPT ); Thu, 27 Nov 2008 11:24:08 -0500 Message-ID: <492EC9A3.5090103@seanodes.com> Date: Thu, 27 Nov 2008 17:24:03 +0100 From: Erwan Velu MIME-Version: 1.0 Subject: Re: Inconsency between cli output and gnuplot References: <49243E53.10309@seanodes.com> In-Reply-To: <49243E53.10309@seanodes.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: fio-owner@vger.kernel.org List-Id: fio@vger.kernel.org To: fio@vger.kernel.org Erwan Velu wrote: > My 1.23 fio ouput display : > > read : io=32,003MiB, bw=131MiB/s, iops=1,362, runt=250326msec > slat (usec): min=13, max=145, avg=16.69, stdev= 3.39 > clat (msec): min=31, max=129, avg=46.94, stdev= 7.24 > > clat output of gnuplot reports units in msec. The clat gnuplot output > show a msec label on the y axis but trace some usec. > > slat cli reports values that doesn't match at all what is viewable > from gnuplot output. Averagage is said to be 16 on the cli whereas the > gnuplot trace shows 20 at min. > Max is said to be 145 for slat but displayed at 60 on the gnuplot. > Slat is also said to be usec on the cli but shown as msec on the y > axis of the gnuplot. > > Complete archive showing that could be downloaded at > http://konilope.linuxeries.org/tmp/localr.tar.bz2 > > It seems that units may vary from the cli output regarding the range > of results. I have some case where clat is shown in usec instead of > msec. Maybe that what confuse the gnuplot output. > Like in : > write: io=32,003MiB, bw=124MiB/s, iops=1,294, runt=263681msec > slat (usec): min=12, max=71, avg=15.43, stdev= 2.72 > clat (usec): min=663, max=1,537K, avg=49431.63, stdev=108787.82 > bw (KiB/s) : min= 0, max=171311, per=99.91%, avg=127152.93, > stdev=21619.46 > What's your opinion on that ? -- Erwan Velu Pre-Sales Engineer Seanodes http://www.seanodes.com +33 (0)1 41 22 13 83