Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!sdd.hp.com!elroy.jpl.nasa.gov!ncar!gatech!utkcs2!ornl.gov!de5 From: de5@ornl.gov (Dave Sill) Newsgroups: comp.benchmarks Subject: Re: v17i065: iozone - sequential file I/O benchmark fo UNIX, VMS & DOS, Part01/01 Message-ID: <1991Mar25.163527.5052@cs.utk.edu> Date: 25 Mar 91 16:35:27 GMT References: <1991Mar22.212846.16835@sparky.IMD.Sterling.COM> Sender: usenet@cs.utk.edu (USENET News Poster) Reply-To: Dave Sill Organization: Oak Ridge National Laboratory Lines: 40 This was recently posted to comp.sources.misc. In article <1991Mar22.212846.16835@sparky.IMD.Sterling.COM>, norcott@databs.enet.dec.com (Bill Norcott) writes: >Submitted-by: Bill Norcott >Posting-number: Volume 17, Issue 65 >Archive-name: iozone/part01 > >Attached is a benchmark called IOzone which I have written. It was inspired >by Alvin Park's IOstone benchmark (which tests random access I/O). IOzone >tests sequential file I/O using the C language. It writes, then reads, a >sequential file of fixed length records, and measures the read & write >rates in bytes per second. The default is to create a 1 megabyte file >consisting of 2048, 512-byte records -- however, these parameters can be >changed from the command line. On UNIX systems, the results will be influenced >by the effect of the buffer cache -- however, we can largely negate the >effect of caching by using a file size greater than twice the size of the >cache. This will allow a fairer comparison between various disk drives >attached to the system. IOzone IS NOT a direct test of disk performance. Its >results are a combination of disk speed, CPU speed, amount of cache, and the >efficiency of the C compiler & runtime library. This is also true of IOstone, >in fact I intend this program as a companion piece to IOstone. > >This benchmark is portable and has been tested on these operating systems: > > VAX/VMS V5.4 > Ultrix V4.1 > MS-DOS V3.1 > OSF/1 > >IOZONE.C is free and in the public domain. I would appreciate your >comment and test results. > >Bill Norcott (Bill.Norcott.nuo.mts.dec.com) > >[source code deleted] -- Dave Sill (de5@ornl.gov) It will be a great day when our schools have Martin Marietta Energy Systems all the money they need and the Air Force Workstation Support has to hold a bake sale to buy a new bomber.