Hello,

I am trying to measure some performance counters on Ivy Bridge, which has 4
PCM. I would like to know if there is a way to group up counters so that I
can measure events on the same time.

For example, I need to measure 8 counters (e.g., A,B,C,D,E,F,G,H). And I
would like to sample A,B,C,D together and E,F,G,H together.

How can I do this using libpfm? I saw that task.c on perf_examples has a
way to group up counters, but I couldn't use it.

Thank you for any help,

--
Leonardo
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