topic Thanks! in Software Archive

proc_bind

Jen_B_ — Wed, 29 Oct 2014 17:39:35 GMT

I specify for example my env variables as follows: "mic_kmp_place_threads=Xc,1t", "mic_omp_num_threads=X", "mic_kmp_affinity=scatter". I keep X smaller than available cores on mic.

1) Would there be any difference if I set my "mic_omp_proc_bind" to spread or close?

2) Also are there any documentation on "mic_omp_proc_bind"?

In offload, by default, one

TimP — Wed, 29 Oct 2014 20:05:24 GMT

In offload, by default, one of the physical cores is unavailable (reserved for system).

As far as I could see (e.g. by setting mic_kmp_affinity=verbose), mic_kmp_affinity=scatter is the same as mic_omp_proc_bind=spread, but when you have both set, omp_proc_bind may be ignored. If you don't set num_threads to a different value than what was set by kmp_place_threads, I doubt there is a difference between spread and close.

Thanks!

Jen_B_ — Wed, 29 Oct 2014 20:34:03 GMT

Thanks!