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Parallel Hello World

example Hello world for parallel computing.

This is an example parallel program for testing the clusters.

Simple parallel hello world. requires an even number of nodes/cores

/* C Example */
#include <stdio.h>
#include <mpi.h>

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

  MPI_Init (&argc, &argv);	/* starts MPI */
  MPI_Comm_rank (MPI_COMM_WORLD, &rank);	/* get current process id */
  MPI_Comm_size (MPI_COMM_WORLD, &size);	/* get number of processes */
  printf( "Hello world from process %d of %d on host %s\n", rank, size, hostname );
  return 0;
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