Use perfsuite for all core

Question

I am trying to use perfsuite (which internally uses papi) to measure some performance counter around a function. This function spawns one thread per core. The problem is, if I start the counters before the function call and stop them after the call, I get incorrect values for those counters. But if the function doesn't create any threads, it gets the right values.

I know psrun can get counters for all cores for an executable. But I want the same feature for a function call, not an executable.

I am using perfsuite 1.1.1 with papi 4.4.0 from C on Debian.

score 0 · Answer 1 · answered Apr 29 '13 at 16:06

0

PAPI counts are based on threads and not on cores. If you want the latter, you may want to consider using intel pcm - which is capable of providing per-core counts.

Does it answer your question?

tjr

answered Apr 29 '13 at 16:06

TJR

58
4

Thanks for your answer. I don't know how PCM works. And I am not sure that it's true what you claim about PAPI. In any case, my threads are running one per core, using affinity. So, PAPI should work, which is what I need. – Rakib May 13 '13 at 20:16

Use perfsuite for all core

1 Answers1