MathGroup Archive 2007

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multi-threading on Mac OS X.

  • To: mathgroup at
  • Subject: [mg73673] multi-threading on Mac OS X.
  • From: Matthew Horrobin <horrobin at>
  • Date: Sat, 24 Feb 2007 02:19:19 -0500 (EST)
  • Organization: Faculty of Science, University of Amsterdam


 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 

Does anyone know how to get mutli-threading full working on OS X?



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