text: #include <stdio.h>
  #include <mpi.h>
  
  int main (int argc, char *argv[])
  {
    int rank, size;
  
    MPI_Init (&argc, &argv);
    MPI_Comm_rank (MPI_COMM_WORLD, &rank);
    MPI_Comm_size (MPI_COMM_WORLD, &size);
    printf( "Hello world from process %d of %d\n", rank, size );
    MPI_Finalize();
    return 0;
  }
  
  