[Beowulf] performance tweaks and optimum memory configs for a Nehalem

[Mark Hahn]

> Is there a way of finding out within Linux if Hyperthreading is on or
> not?

in /proc/cpuinfo, I believe it's a simple as siblings > cpu cores.
that is, I'm guessing one of your nehalem's shows as having 8 siblings
and 4 cpu cores.
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