Hi,
I am reading the some counters' values in a single program with multiple
threads. The counters are instruction retired and last level cache misses.
There are three threads, two are programmed to be per-thread self-monitoring
and one is programmed for system-wide monitoring. All the threads are pinned to
the same core and reading the same counters' values.
My question is: Should the sum of a counter's value for the two threads for the
per-thread session be equal or less than that of the system-wide session? In
short: what is the relation between the same counter's value for per-thread and
systems-wide monitoring?
In my case, the system-wide values for both instruction retired and last-level
cache misses on core 0 are much less than the counters values read by the
threads in s per-thread session. For the system-side session, I have set only
the pfp_flag for the pfmlib_input_param_t structure. Do I need to do anything
else? Am I making any mistakes?
Thanks
Tanima.
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