From owner-freebsd-hackers Sun Apr 14 16:14:30 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id QAA20716 for hackers-outgoing; Sun, 14 Apr 1996 16:14:30 -0700 (PDT) Received: from palmer.demon.co.uk (palmer.demon.co.uk [158.152.50.150]) by freefall.freebsd.org (8.7.3/8.7.3) with ESMTP id QAA20711 for ; Sun, 14 Apr 1996 16:14:24 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by palmer.demon.co.uk (sendmail/PALMER-1) with SMTP id AAA01063 ; Mon, 15 Apr 1996 00:13:51 +0100 (BST) To: "Marc G. Fournier" cc: nash@mcs.com, hackers@FreeBSD.ORG From: "Gary Palmer" Subject: Re: Unices are created equal, but... In-reply-to: Your message of "Sun, 14 Apr 1996 18:48:36 EDT." Date: Mon, 15 Apr 1996 00:13:50 +0100 Message-ID: <1061.829523630@palmer.demon.co.uk> Sender: owner-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk "Marc G. Fournier" wrote in message ID : > IOZONE performance measurements: > 2155321 bytes/second for writing the file > 2092693 bytes/second for reading the file > (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. That's weird: Disk 0: (ahc0:0:0): "CONNER CFP1060S 1.05GB 1823" type 0 fixed SCSI 2 sd0(ahc0:0:0): Direct-Access sd0(ahc0:0:0): 1013MB (2074880 512 byte sectors) iozone 32 IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94) By Bill Norcott Operating System: FreeBSD 2.x -- using fsync() Send comments to: b_norcott@xway.com IOZONE writes a 32 Megabyte sequential file consisting of 65536 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 32 Megabyte file, 'iozone.tmp'...15.546875 seconds Reading the file...10.906250 seconds IOZONE performance measurements: 2158275 bytes/second for writing the file 3076624 bytes/second for reading the file Disk 1: (ahc0:1:0): "FUJITSU M1603S-512 6404" type 0 fixed SCSI 2 sd1(ahc0:1:0): Direct-Access sd1(ahc0:1:0): 519MB (1064268 512 byte sectors) IOZONE: Performance Test of Sequential File I/O -- V2.01 (10/21/94) By Bill Norcott Operating System: FreeBSD 2.x -- using fsync() Send comments to: b_norcott@xway.com IOZONE writes a 32 Megabyte sequential file consisting of 65536 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 32 Megabyte file, 'iozone.tmp'...15.367188 seconds Reading the file...9.437500 seconds IOZONE performance measurements: 2183511 bytes/second for writing the file 3555436 bytes/second for reading the file In both cases, it was at least 42% faster for reading than writing... Gary