[Beowulf] Woodcrest Memory bandwidth
jholmes at psu.edu
Mon Aug 14 13:16:07 PDT 2006
Joe Landman wrote:
> I have it on good authority that with the other chipset (we have a
> Blackford here), we should see higher numbers. Not exceeding the
> Opteron 275 though.
We have both a greencreek based (the one with the snoop filter.. I guess
they're calling it the 5000x now) and a blackford based system and I'm
not seeing any difference beyond a percent or two of performance either
in stream or in real applications. Maybe we just haven't hit the magic
app that greencreek helps yet.
> What I can say is that Woodcrest is interesting. It just may be
> overhyped by a "compliant" media.
I'd say it's a bit overhyped, but it is giving us some good real
application numbers compared to the opterons. On NAMD, Amber, and VASP
so far, we've seen 2.66 GHz Woodcrest between 10-20% faster than our 2.4
GHz dual-core Opterons while using all 4 processors in a box. It's not
the 50% media hype numbers, but it's definitely an improvement on the
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