Dear all, I am experiencing a strange error.
In my code I use three group communications: MPI_COMM_WORLD MPI_MASTERS_COMM LOCAL_COMM which have in common some CPUs. when I run my code as mpirun -np 4 --oversubscribe ./MPIHyperStrem I have no problem, while when I run it as mpirun -np 4 --oversubscribe ./MPIHyperStrem sometimes it crushes and sometimes not. It seems that all is linked to CALL MPI_REDUCE(QTS(tstep,:), QTS(tstep,:), nNode, MPI_DOUBLE_PRECISION, MPI_SUM, 0, MPI_LOCAL_COMM, iErr) which works with in local. What do you think? Can you please suggestion some debug test? Is a problem related to local communications? Thanks Diego
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