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

Rahul Nabar rpnabar at gmail.com
Mon Aug 10 12:29:42 EDT 2009


On Mon, Aug 10, 2009 at 7:33 AM, Mark Hahn<hahn at mcmaster.ca> wrote:
> 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.

Yes. That works. Also looking at the "physical id" helps.

I was confused by the ht flag. Apparently that is not relevant/. It
only indicates whether the CPU can report hyperthreading or not.

No wonder all my boxes have that "ht" flag.

-- 
Rahul
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