[Beowulf] Anybody going with AMD Istanbul 6-core CPU's?
h-bugge at online.no
Wed Aug 26 00:21:56 PDT 2009
On Aug 25, 2009, at 19:09 , Craig Tierney wrote:
> As far as using threading, I doubt that threading is going to buy you
> much for WRF. Minimal testing showed no benefit and it is more likely
> to cause confusion to the users than a small bump in speed. We
> would like
> to test it more in the future, but right now the users need cycles.
This is consistent with my findings in "An Evaluation of Intel’s Core
i7 Architecture using a Comparative Approach". WRF, as embodied into
the SPEC MPI2007 suite, ran 2% slower using threading on a single-
node, dual-core Nehalem system. Out of the 13 apps constituting the
suite, three ran slower (2,3, and 4%), five ran +10% faster, with
122.tachyon excelling at a 35% speedup from threading.
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