Hi,
I got the answer to my previous question. In my case, system-wide and
per-thread monitoring session is not co-existent. Is it always the case? I got
from a documentation that such determination of co-existence is possible when
the context is attached, not when it is created. Can anyone tell me how to do
it?
Thanks
Tanima.
________________________________
From: Tanima Dey <dey_tr...@yahoo.com>
To: Perfmon <perfmon2-devel@lists.sourceforge.net>
Sent: Monday, August 3, 2009 2:06:53 PM
Subject: [perfmon2] Counters' value perthread/systemwide
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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