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

int main(int argc, char **argv)
{
  int rank;
  char hostname[256];

  MPI_Init(&argc,&argv);
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  gethostname(hostname,255);
  printf("Hello from process %3d on host %s\n", rank, hostname);
  MPI_Finalize();
  return 0;
}