MPI_Init -- Environment Management

• This MUST be called to set up MPI before any other MPI routines may be called

• For C: int MPI_Init(int *argc, char **argv[] )

  • argc and argv[] are conventional C main routine arguments
  • As usual MPI_Init returns an error

• For Fortran: call MPI_INIT(mpierr)

  • nonzero (more pedantically values not equal to MPI_SUCCESS) values of mpierr represent errors

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