Running Oprofile with MPI

Question

I'm having issues using Oprofile to profile a parallel program that I call via mpirun. The command I'd like to use is:

    $ operf mpirun -n 4 [program and arguments]

Unfortunately, when I do this, operf starts logging, but something funny happens when the MPI program is finished - operf seems to not recognize that it's returned (MPI-spawned processes no longer appear in htop, but operf still does), and things just hang waiting for me to interrupt them.

Is there an option I can pass to operf or mpirun which will make the two play nicely together? Failing that, is there a bash trick I can use to automatically kill operf when my MPI program is finished?

Edit: Previously thought that it Oprofile wasn't always generating results, but it turns out that I was just confused and looking in the wrong location. The only problem is that operf doesn't recognize that the MPI program has terminated.

Is your MPI job running on one node (i.e. single operating system instance) or multiple? — Aaron Altman, Apr 03 '14 at 21:45
Did you try running "mpirun ... operf [prog + args]"? That might be the way to go — , Jan 06 '16 at 00:34

score 0 · Answer 1 · edited Nov 28 '17 at 19:55

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Try using this line, it works like a charm:

sudo operf mpirun --allow-run-as-root -x LD_LIBRARY_PATH="build/" -np 2 (path_to_the_file)

edited Nov 28 '17 at 19:55

Paul Roub

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answered Nov 28 '17 at 19:41

Ayman Sabbah

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Running Oprofile with MPI

1 Answers1