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Alex Rivera
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I having some synchronization issues using the OpenMPI implementation of MPI_Barrier: int rank; int nprocs; int rc = MPI_Init(&argc, &argv); if(rc != MPI_SUCCESS) { fprintf(stderr, "Unable to set up MPI"); MPI_Abort(MPI_COMM_WORLD, rc); } MPI_Comm_size(MPI_COMM_WORLD, &nprocs); MPI_Comm_rank(MPI_COMM_WORLD, &rank); printf("P%d\n", rank); fflush(stdout); MPI_Barrier(MPI_COMM_WORLD); printf("P%d again\n", rank); MPI_Finalize(); for mpirun -n 2 ./a.out output should be: P0 P1 ... output is sometimes : P0 P0 again P1 P1 again what's going on?
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