Re: [eigen] a branch for SMP (openmp) experimentations

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On 02/23/2010 06:34 AM, Aron Ahmadia wrote:
I'm curious about the difference between OpenMP and pthreads.  I know
there is a bit of overthread in OpenMP but I didn't realize it would
be so meaningful.  This will of course vary between architectures and

My experience in a nutshell: OpenMP is elegant, but immature and less available compared to pthreads.

At my company, we started using OpenMP but after a while we scrapped it in favor of pthreads because of
a) availability  across platforms
b) predictability across platforms
c) major shortcoming uncovered in intel's OpenMP -- its critical section locks are implemented as spinlocks

-- Mark

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