Path: utzoo!mnetor!tmsoft!torsqnt!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!mcsun!ukc!tcdcs!maths.tcd.ie!ajudge
From: ajudge@maths.tcd.ie (Alan Judge)
Newsgroups: comp.benchmarks
Subject: Re: Sparcstation 2 Write I/O
Message-ID: <1991Feb19.101559.8441@maths.tcd.ie>
Date: 19 Feb 91 10:15:59 GMT
References: <152@edi386.UUCP> <1991Feb16.145828.12539@maths.tcd.ie> <155@edi386.UUCP>
Organization: Dept. of Maths, Trinity College, Dublin, Ireland.
Lines: 17

In <155@edi386.UUCP> eddjp@edi386.UUCP ( Dewey Paciaffi ) writes:
>I've also gotten similar results  dd and mkfile. Unfortunately all of my
>programs use the write system call, and it only does about 270 kb on
>a quiet system, using SunOs 4.1.1. My 386 does about half as good, and
>my RS/6000 gets about 3 MB on the writes on a quiet system...

The main difference, I think, is not write vs dd, but the size of the
buffer used.  I wrote a program yesterday (for an entirely different
reason) that generates a whole series of 500k files using a single
write for each.  I didn't time it too well, but it was getting at least
1Mb/s.  (I think that the slow down vs dd is because I was generating lots
of separate files, with the attendant updates of inodes and directories,
rather than one large file.)
-- 
Alan Judge   ajudge@maths.tcd.ie  a.k.a. amjudge@cs.tcd.ie +353-1-772941 x1782

"If we don't succeed, then we run the risk of failure."  -- Dan Quayle