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MathGroup Archive 2007

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Re: multi-threading on Mac OS X.

  • To: mathgroup at
  • Subject: [mg73783] Re: multi-threading on Mac OS X.
  • From: Jens-Peer Kuska <kuska at>
  • Date: Wed, 28 Feb 2007 04:35:36 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <eropih$9b6$>
  • Reply-to: kuska at


I don't think that it is working because
the mysique OMP_NUM_THREADS variable mean
that you wish to use OpenMP and AFAIK
this is only supported by Intel Compilers for
MacOS X and GCC 4.2 ...
The Intel compiler work only on Intel Macs
and GCC 4.2 is not finished.


Matthew Horrobin 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 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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