I ran some very crude tests and found that things slowed down once you
got over 8 cores at a time. However, they didn't slow down by 50% if
you went to 16 processes. Sadly, the tests were so crude, I did not
keep good notes (it appears).
I'm running a gcm, so my benchmarks may not be very useful to most
folks. If there was an easy-to-compile benhmark that I could run on
my cluster, I'd be curious what the results are too.
On 11-Jul-09, at 2:16 PM, Robert Kubrick wrote:
> The Open MPI FAQ recommends not to oversubscribe the available cores
> for best performances, but is this still true? The new Nehalem
> processors are built to run 2 threads on each core. On a 8 sockets
> systems, that sums up to 128 threads that Intel claims can be run
> without significant performance degradation. I guess the last word
> is to those who have tried to run some benchmarks and applications
> on the new Intel processors. Any experience to share?
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