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MathGroup Archive 2006

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Re: Illusory Multicore Support in 5.2?

  • To: mathgroup at
  • Subject: [mg66026] Re: [mg66000] Illusory Multicore Support in 5.2?
  • From: Pratik Desai <pratikd at>
  • Date: Thu, 27 Apr 2006 02:26:24 -0400 (EDT)
  • References: <>
  • Sender: owner-wri-mathgroup at

Contrablue wrote:
> Greetings,
> One of the reasons I upgraded to Mathematica 5.2 was to enjoy the
> benefits of multicore support.  However, despite my running 5.2 on a
> Windows XP x64  dual Opteron system, I have yet to see evidence that
> more than one kernel thread runs in parallel (the evidence, on my
> system, would be to see processor utilization rise above 50% while only
> the Mathematica kernel was active).  This is despite trying quite a few
> evaluations of code that "should" -- according Wolfram documentation --
> initiate parallel execution on my system (numerical dot products, etc.)
> Please note, my system fully supports true multithreaded execution on
> two CPUs, as evidenced by 100% CPU utilization on relevant Sandra
> benchmarks and on the new multithreaded POV-Ray releases for AMD64.
> Has anyone verified multithreaded kernel operation of Mathematica 5.2
> on a dual processor Windows platform?  If so, could you post a snippet
> of your Mathematica expressions here?
> Thanks much!
Try using SingularValueDecomposition on a sufficiently large matrix

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