From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262269AbTJGOam (ORCPT ); Tue, 7 Oct 2003 10:30:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262331AbTJGOam (ORCPT ); Tue, 7 Oct 2003 10:30:42 -0400 Received: from h68-147-142-75.cg.shawcable.net ([68.147.142.75]:39161 "EHLO schatzie.adilger.int") by vger.kernel.org with ESMTP id S262269AbTJGOak (ORCPT ); Tue, 7 Oct 2003 10:30:40 -0400 Date: Tue, 7 Oct 2003 08:29:44 -0600 From: Andreas Dilger To: "E. Gryaznova" Cc: linux-kernel@vger.kernel.org Subject: Re: Can dbench be used for benchmarking fs? Message-ID: <20031007082944.D1564@schatzie.adilger.int> Mail-Followup-To: "E. Gryaznova" , linux-kernel@vger.kernel.org References: <3F82B4C6.707221A@namesys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <3F82B4C6.707221A@namesys.com>; from grev@namesys.com on Tue, Oct 07, 2003 at 04:42:46PM +0400 X-GPG-Key: 1024D/0D35BED6 X-GPG-Fingerprint: 7A37 5D79 BF1B CECA D44F 8A29 A488 39F5 0D35 BED6 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Oct 07, 2003 16:42 +0400, E. Gryaznova wrote: > I use dbench for benchmarking the file systems and some results are > suspicious for me. > : > : > : > As the result: the measuring deviation is equal = 23.4062 - 15.7005 = > 7.7057 or about ~38% from average value. > > So, I have 2 questions : > 1. Is there a way to avoid such big deviations on measuring a file > systems throughput and to get more stable results? > 2. Can dbench be used for benchmarking the file systems and if it is so > -- what is the predictable error on the measuring? Dbench is not a good filesystem benchmark, because it deletes all of the files at the end. Use something else for the filesystem benchmark - there are lots of them (bonnie, iozone, mongo, etc). Cheers, Andreas -- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://www-mddsp.enel.ucalgary.ca/People/adilger/