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model name  : Intel(R) Core(TM) i7 CPU       Q 720  @ 1.60GHz
perf version 3.2.33
python 2.7
OS: Linux. Distro: Ubuntu 12.10

I am trying to collect, PerThread performance counters using perfmon. these are the events that I am trying to collect: perf_events=['INSTRUCTIONS_RETIRED','L2_LINES_IN','LLC_MISSES']

I am able to collect the data at times - unpredictable. Sometimes, I am able to collect the data. I am trying to run the PARSEC - CANNEAL Benchmark thread. 

 File "/usr/lib/python2.7/dist-packages/apport_python_hook.py", line 44, in apport_excepthook

This is the error, I keep getting sometimes. I tried googling about scenario's, if people had this kind of issue Google keywords: "perfmon perthread session traces unpredictable" | perfmon events collection intel unpredictable

I could also post snippets of the code, if necessary.

One more interesting thing I notice is, if I run the same thread twice, without killing the previous thread. I am able to collect it everytime. Does that mean anychance mean? that I don't have enough IPS to report in the first instance? that can't be the case, because - the "top"shows that the core is at 100% Thanks

user1860977
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  • Can you try `perf` tool? It is included in the Ubuntu ("sudo apt-get install linux-tools"), there is a tutorial: https://perf.wiki.kernel.org/index.php/Tutorial – osgx Dec 07 '12 at 04:53
  • I have to use perfmon because it provides PerThreadSessions - which will be used later. I have tried with "perf" it works fine. Was wondering why this error would occur. – user1860977 Dec 07 '12 at 05:02

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