Usually that means you have a mismatch in your OMPI versions - you may have built the app with one version and are running it against another, for example, or perhaps compiled them against MPICH and run them using OMPI's mpirun/mpiexec.
Hello
When I run multiple processes on one machine, all of them get rank 0 and size 1 no matter how many I set. Exactly same installation works fine on different machine, what can be wrong?
Regards
Bartlomiej Wach
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