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MathGroup Archive 2007

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Re: multi-threading on Mac OS X.

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73707] Re: [mg73673] multi-threading on Mac OS X.
  • From: Stern <nycstern at gmail.com>
  • Date: Sun, 25 Feb 2007 04:35:17 -0500 (EST)
  • References: <200702240719.CAA09299@smc.vnet.net>

I believe that you need to get the parallel computing toolkit or the
personal grid edition in order to take advantage of multiple cores and
multiple CPUs. I know that Mathematica on its own does not go past 25%
usage of my four-core computer, but with the parallel computing
toolkit and four kernels, I hit 100% when using appropriate parallel
calls.

Michael


On 2/24/07, Matthew Horrobin <horrobin at science.uva.nl> wrote:
> Hi,
>
>  I'm trying to get full performance out of my Dual CPU PowerMac G5.
>
> Using tests that I've found in the mathgroup e.g.:
>
> Eigenvalues[Table[Random[], {1500}, {1500}]];I
>
> I never seem to get much more than 100% CPU load (fully loaded would be
> 200%), even when setting OMP_NUM_THREADS=2, as is recomended for other
> OS's.
>
> Does anyone know how to get mutli-threading full working on OS X?
>
> Cheers,
>
> Matt
>
>
>


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