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

Rahul Nabar rpnabar at gmail.com
Mon Aug 10 16:02:51 EDT 2009


On Mon, Aug 10, 2009 at 2:09 PM, Joshua Baker-LePain<jlb17 at duke.edu> wrote:
> Well, as there are only 8 "real" cores, running a computationally intensive
> process across 16 should *definitely* do worse than across 8. However, it's
> not so surprising that you're seeing peak performance with 2-4 threads.
>  Nehalem can actually overclock itself when only some of the cores are busy
> -- it's called Turbo Mode.  That *could* be what you're seeing.

That could very well be it! Is there any way to test if the CPU has
overclocked itself?

Or can I turn the "turbo mode" off and check?

-- 
Rahul

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