From owner-freebsd-hackers Sun Apr 14 15:48:42 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id PAA19274 for hackers-outgoing; Sun, 14 Apr 1996 15:48:42 -0700 (PDT) Received: from ki.net (root@ki.net [205.150.102.1]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id PAA19269 Sun, 14 Apr 1996 15:48:38 -0700 (PDT) Received: from localhost (scrappy@localhost) by ki.net (8.7.4/8.7.4) with SMTP id SAA25740; Sun, 14 Apr 1996 18:48:40 -0400 (EDT) Date: Sun, 14 Apr 1996 18:48:36 -0400 (EDT) From: "Marc G. Fournier" To: Gary Palmer cc: nash@mcs.com, hackers@FreeBSD.ORG Subject: Re: Unices are created equal, but... In-Reply-To: <852.829520523@palmer.demon.co.uk> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On Sun, 14 Apr 1996, Gary Palmer wrote: > Alex Nash wrote in message ID > <199604142039.PAA04761@zen.nash.org>: > > FreeBSD on UFS: > > 2770803 bytes/second for writing the file > > 3908495 bytes/second for reading the file > > > > Linux on ext2fs: > > 3220442 bytes/second for writing the file > > 1950476 bytes/second for reading the file > > ^^^^^^^ > > Is that 2nd figure for reading the file right? Seems a bit dubious > ... unless they're really doing something screwey, you should get > higher speeds READING than writing ... > > Gary > You might think so, but: > iozone 22 IOZONE: Performance Test of Sequential File I/O -- V1.16 (10/28/92) By Bill Norcott Operating System: POSIX 1003.1-1988 -- using fsync() Send comments to: norcott_bill@tandem.com IOZONE writes a 22 Megabyte sequential file consisting of 45056 records which are each 512 bytes in length. It then reads the file. It prints the bytes-per-second rate at which the computer can read and write files. Writing the 22 Megabyte file, 'iozone.tmp'...10.703125 seconds Reading the file...11.023438 seconds IOZONE performance measurements: 2155321 bytes/second for writing the file 2092693 bytes/second for reading the file > df . Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/sd0s1d 224174 108770 97470 53% /home (ncr0:0:0): "QUANTUM FIREBALL1280S 630C" type 0 fixed SCSI 2 sd0(ncr0:0:0): Direct-Access sd0(ncr0:0:0): FAST SCSI-2 100ns (10 Mb/sec) offset 8. Not much of a difference, but still slower to read then to write. (-stable kernel as of March 26th) Marc G. Fournier scrappy@ki.net Systems Administrator @ ki.net scrappy@freebsd.org