/*
   Based on:

   http://darrenjw.wordpress.com/2010/12/14/getting-started-with-parallel-mcmc/ 
   by Darren Wilkinson

   apt-get -y install gcc libopenmpi-dev openmpi-bin
   mpicc -o helloworld helloworld.c
   mpirun -np 2 helloworld
*/

#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;
}