//helloWorldMPI.c, from John Urbanic psc slides

#include <stdio.h>
#include "mpi.h"

int main(int argc, char **argv)
{
    int my_PE_num;
    MPI_Init(&argc, &argv);
    MPI_Comm_rank(MPI_COMM_WORLD, &my_PE_num);
    printf("Hello from %d.\n", my_PE_num);
    MPI_Finalize();
    return 0;
}

/*
Cray SV1 version:

cc helloWorldMPI.c

mpirun -np 4 a.out

Hello from 0.
Hello from 2.
Hello from 1.
Hello from 3.

mpirun -np 16 a.out
Hello from 0.
Hello from 1.
Hello from 2.
Hello from 3.
Hello from 4.
Hello from 5.
Hello from 6.
Hello from 8.
Hello from 9.
Hello from 10.
Hello from 7.
Hello from 11.
Hello from 13.
Hello from 14.
Hello from 15.
Hello from 12.

*/