mpi_hello.c

/******************************************************************************
 * * FILE: mpi_hello.c
 * * DESCRIPTION:
 * *   MPI tutorial example code: Simple hello world program
 * * AUTHOR: Blaise Barney
 * * LAST REVISED: 03/05/10
 * ******************************************************************************/
#include <mpi.h>
#include <stdio.h>
#include <stdlib.h>
#define  MASTER 0

int main (int argc, char *argv[]) {
   int   numtasks, taskid, len;
   char hostname[MPI_MAX_PROCESSOR_NAME];

   MPI_Init(&argc, &argv);
   MPI_Comm_size(MPI_COMM_WORLD, &numtasks);
   MPI_Comm_rank(MPI_COMM_WORLD,&taskid);
   MPI_Get_processor_name(hostname, &len);

   printf ("Hello from task %d on %s!\n", taskid, hostname);

   if (taskid == MASTER)
      printf("MASTER: Number of MPI tasks is: %d\n",numtasks);

   //while(1) {}

   MPI_Finalize();
}