reliable/reproduceable benchmarks on SGI MIPS box
Phil Dench
raytrace at cutmcvax.cs.curtin.edu.au
Thu Dec 27 22:27:41 AEST 1990
andrew at alice.att.com (Andrew Hume) writes:
> I am running some benchmarks on a variety of machines
>and in particular, on a SGI 4D/380, a multiprocesor with 8
>33MHz R3000 cpus. my benchmark reads in about 1.1MB of text
>into an internal buffer and then runs cpu bound for about
>40s. total memory usage is <2MB; the machine's memory is 256MB.
>The benchmarks are run with the machine in single user (Unix)
>mode with normally mounted NFS filesystems unmounted. No other
>processes (excpet paging daemon etc) are running.
> my problem is that I see quite large variations over
>multiple runs of the same benchmark, sometimes as much as
>1.26%. Now, the resolution of the timer is .01s and i should se
>an accuracy of about .01/40 or .025%. I am a factor of 50 off this.
>does anyone know how i can run these benchmarks so as to get reproducible
>timings? (i note as an aside that just running the benchmarks on the cray
>in multi-user mode yields variations of the order of .15% which is
>satisfactory).
> andrew hume
> andrew at research.att.com
You LUCKY BASTARD! I dream of 256Mb 8 processor SG plus access to a Cray.
There's no pleasing some people :?)
--
Phil Dench Andrew Marriott.
--------------------------------------------+----------------------------------
| School of Computer Science,
ACSNet: raytrace at cutmcvax.cs.curtin.edu.au | Curtin University of Technology,
UUCP: ...!uunet!munnari!cutmcvax!raytrace | Kent Street,
ARPA: raytrace at cutmcvax.cs.curtin.edu.au | Bentley
| Western Australia, 6102
--------------------------------------------+----------------------------------
More information about the Comp.sys.sgi
mailing list