From: William C. <wc...@re...> - 2022-04-05 14:21:50
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On 4/5/22 05:59, Giri Prasad wrote: > 1) I installed operf in linux machine, below is the version: > > operf: oprofile 1.3.0 compiled on Feb 2 2020 20:33:34 > > 2) I wrote a simple program and ran : *operf ./a.out* > > 3) it generated the folder: *oprofile_data* > * > * > 4) when i run opreport as below: > * > * > *##> opreport session:oprofile_data event:DATA_MEM_REFS > Using /home/prasadgi/tools/cpp/oprofile_data/samples/ for samples directory. > opreport error: No sample found: Please specify a session containing > sample data.* > * > * > *Please help what is missing ?* > * > * > Regards, > Giri Prasad > > > _______________________________________________ > oprofile-list mailing list > opr...@li... > https://lists.sourceforge.net/lists/listinfo/oprofile-list Hi, By default operf is going to use a clock cycle event to record samples . You should see samples if you do "opreport". However, if the program runs for a very short amount of time there might not be enough events (cycles) to trigger a sample. If you want to get samples of the DATA_MEM_REFS you are going to need to specify the events with the --events / -e option for operf: https://oprofile.sourceforge.io/doc/controlling-profiler.html#controlling-operf You might also consider using linux perf: https://perf.wiki.kernel.org/index.php/Main_Page -Will |