//HelloWorldMPI, 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;
}

/*
mpicc -o helloWorldMpi helloWorldMpi.c
lamboot -v lamhosts   (this file has 4 hosts)

LAM 6.5.6/MPI 2 C++/ROMIO - University of Notre Dame

Executing hboot on n0 (helium.tjhsst.edu - 1 CPU)...
Executing hboot on n1 (silicon.tjhsst.edu - 1 CPU)...
Executing hboot on n2 (phosphorus.tjhsst.edu - 1 CPU)...
Executing hboot on n3 (magnesium.tjhsst.edu - 1 CPU)...
Executing hboot on n4 (deadend.tjhsst.edu - 1 CPU)...
topology done      

mpirun N helloWorldMPI
Hello from 4.
Hello from 2.
Hello from 1.
Hello from 3.
Hello from 0.


lamclean
lamhalt
*/