MPI Hello World

MPI Hello World

Many parallel jobs are using MPI at the lowest level to manage parallel compute resources.

This is a 'Hello World' program that will test the operation of sending jobs to remote workers.

/*
* Sample MPI "hello world" application in C
*/

1. include <stdio.h>
2. include "mpi.h"

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

   int rank, size, len;
   char version[MPI_MAX_LIBRARY_VERSION_STRING];

   MPI_Init(&argc, &argv);
   MPI_Comm_rank(MPI_COMM_WORLD, &rank);
   MPI_Comm_size(MPI_COMM_WORLD, &size);
   MPI_Get_library_version(version, &len);
   printf("Hello, world, I am %d of %d, (%s, %d)\n",
          rank, size, version, len);
   MPI_Finalize();

   return 0;

}