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Re: multi-threading on Mac OS X.

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  • Subject: [mg73707] Re: [mg73673] multi-threading on Mac OS X.
  • From: Stern <nycstern at>
  • Date: Sun, 25 Feb 2007 04:35:17 -0500 (EST)
  • References: <>

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


On 2/24/07, Matthew Horrobin <horrobin at> 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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