// A simple MPI "Hello World"
//
// To compile
//
//    [mymachine]:  mpicc -o hellompi hellompi.c
//
// and to run
//
//    [mymachine]:  mpirun --oversubscribe -np 8 ./hellompi
// 
// where the number (here 8) gives the number of processes you want.
//

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

int main(int argc, char *argv[])
{

  int rank, p;

  // Explore the world
  MPI_Init(&argc, &argv);
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  MPI_Comm_size(MPI_COMM_WORLD, &p);

  // Say hello
  printf ("Hello world from process %d of %d\n", rank, p);

  MPI_Finalize();
}