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From: frechett@benji.Colorado.EDU (-=Runaway Daemon=-)
Subject: Re: linux's I/O calls faster than NetBSD's ?
Message-ID: <CMFvuI.IHu@cnsnews.Colorado.EDU>
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References: <2lhv9r$pbt@homea.ensta.fr>
Date: Thu, 10 Mar 1994 08:06:17 GMT
Lines: 28
Sounds like you managed to get the whole operation into linux's
disk cache. A similiar effect on bsd can be had if you run
your very disk IO intensive stuff from an MFS drive. If I run
your program from /tmp where it is basically on a 10M RAM drive
DEBUT
5000
C'EST TERMINE............
TEMPS ECOULE EN SECONDES: 16
And from /usr
DEBUT
5000
C'EST TERMINE............
TEMPS ECOULE EN SECONDES: 331
Can't quite get it down to 4 seconds but the effect is quite obvious
for anyone who has lot of memory. If the linux box had less memory
I suspect it would perform closer to *BSD's non-MFS numbers.
I'm not sure if I like unified caches yet as I've seen them seriously
cripple an Alpha box. Having not spent much time in Linux I can't
say if it's better than OSF/1's implementation or not.
ian