From: James Cook (email@example.com)
Date: Mon Aug 19 2002 - 09:37:37 CDT
On Fri, 16 Aug 2002, John D McCalpin wrote:
> These results are, unfortunately, typical of IA32 systems.
> Intel has designed the processor to be able to saturate the
> front-side bus, so adding another CPU provides no benefit.
> In some cases there is a minor degradation from the extra
> address traffic.
Yes. I discussed the results with some people and they said the same
thing. Thanks. However, I have some MPI results and I got a bit of a
performance increase running on 2 cpus for the athlon yet no increase in
performance for the PentiumIII.
We have a 16 node cluster using the same computers I did the previous
tests on. Of the 16 computers, 9 are Pentium-III@933Mhz. The other 7 are
the Athlon 1900+ MP at 1.6Ghz. Each have a Dolphin D339 SCI card using
Scali MPI (which comes from Scali SSP 3.0.1)
I have attached the results. I ran the following tests:
1 Pentium, 1 cpu
1 Pentium, 2 cpu
1 Athlon, 1cpu
1 Athlon, 2cpu
4 Petium, 2cpu
4 Athlon, 2cpu
And all 16 nodes.
Steacie Institute for Molecular Sciences
National Research Council Canada
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