Unable to use all the Hardware counters - PAPI v5.0.1

[gany47]

Hi all,

Below is my working setup

PAPI v5.0.1
Intel(R) Core(TM) i7-3770 (Ivy Bridge) Family : 6 Model : 58
Ubuntu 12.04 (precise) 64 bit / Kernel Linux 3.6.0-030600rc7-generic

"papi_avail -a " shows the number of available hardware counters to be 11

Number Hardware Counters : 11

However, whenever I add more than 5 events to the event_set, I am getting the PAPI_ECNFLCT error. Can someone help me overcome this and utilize at least 8 or 9 counters if not all 11.

Thanks,
Ganesh

[danterpstra]

Yes, Sandy and Ivy Bridge processors technically have 11 counters. No, you're not likely to be able to use them all.
We described this situation in some detail in a tech note here: http://icl.cs.utk.edu/projects/papi/wiki/PAPITopics:SandyFlops.
Let us know if you have any more questions.

[gany47]

Thanks a lot for the pointer. Very useful note indeed for the platform I am working on.