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Intel Phi affinity with openMP

Mahendra_S_
Beginner
‎04-27-2015 09:29 PM
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Hi,

I am testing the Intel Phi affinity with openMP. Please explain what is the default openMP affinity on Intel Phi. That is when #pragma omp parallel proc_bind(xxx) is not specifying.

The following figure shows the time spent by an algorithm when spread, close and default affinities are set. The program runs in offload mode.affinity.jpg

 

I noticed the default affinity is better than spread or close. Why?

Thank you.

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