Debugging MPI

• Example:

• -q option prints message queue contents

$ legion_mpi_debug /mpi/programs/mpi_app

Process 0: Broadcasting message dest 2 comm 8101e60

Process 1: in MPI_Recv source 0 tag 0 comm 8101e60

Process 2: in MPI_Recv source 1 tag 0 comm 8101e60

Process 3: in MPI_Recv source 2 tag 0 comm 8101e60

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