Common MPI Mistakes

• Forgetting ierr in (FORTRAN)

• Declaring status incorrectly (FORTRAN)

  • array of integers of size MPI_STATUS_SIZE

• Declaring string variable incorrectly (FORTRAN)

  • character*10 a not character a(10)

• Expecting argv, argc to be passed to all processes (C)

• Doing things before MPI_Init or after MPI_Finalize()

• Matching MPI_Bcast with MPI_Recv

• Assuming that your MPI implementation is thread safe

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