Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!uunet!munnari.oz.au!uniwa!DIALix!bernie From: bernie@DIALix.oz.au (Bernd Felsche) Newsgroups: comp.sys.amiga.hardware Subject: Re: Filesystem Speeds (was Re: GVP Trade-in) Summary: Equivalent hardware? Keywords: SCSI, GVP Message-ID: <560@DIALix.UUCP> Date: 3 Sep 90 11:58:44 GMT Expires: 31 Aug 90 00:00:00 GMT References: <552@DIALix.UUCP> <14069@cbmvax.commodore.com> <558@DIALix.UUCP> <6499@sugar.hackercorp.com> Reply-To: bernie@DIALix.oz.au (Bernd Felsche) Organization: DIALix Services, Perth Western Australia Lines: 38 In article <6499@sugar.hackercorp.com> peter@sugar.hackercorp.com (Peter da Silva) writes: >In article <558@DIALix.UUCP> bernie@DIALix.oz.au (Bernd Felsche) writes: >> I presume that you're talking about System V.x here. Berkeley FFS >> does heaps better, as does SunOS, which caches block disk I/O into ^^^^^^^^ I meant better than System V, not AmigaDOS >> all available RAM. > >Last time I saw any benchmarks, the Amiga *with equivalent hardware* was way >faster than SunOS. Could you substantiate this claim with figures? That's a tough question.... The only stat's I have are from diskperf > 4MB/sec - which is rubbish, because SunOS was caching the lot in RAM for normal disk I/O. AmigaDOS loses on that account. Raw I/O peak was close to ideal (UNIX is no good for timing things) and averaged at over 50% of disk specs for sustained throughput (approx 1.2MB/sec out of 1.8 for the drive). I don't recall actual figures, as I did the testing some 5 months ago (around Easter). Raw I/O is very CPU dependent (it surprised me too) because I was using "dd etc... >/dev/null", and you must consider the 33MHz SPARC chip grunts long at 22 MIPS, or thereabouts, on this sort of thing. I _do_ recall that throughput was very sensitive to input block size. I think somewhere around 8K - 16K was best. >-- >Peter da Silva. `-_-' >. Thanks for catching my earlier slip-up, comparing filesystems. I did not intend to mislead the reader. That is why I asked about stats for the A3000 with AMIX vs AmigaDOS. bernie P.S. The SunOS stat's were not run on a Sun.