MPI_多节点执行程序[通俗易懂]

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

int main (int argc, char* argv[]) {
  char hostname[100];
  int rank, size;
  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 */

  gethostname(hostname,sizeof(hostname));

  printf( "Hello world from process %d of %d: host: %s\n", rank, size, hostname);
  MPI_Finalize();
  return 0;

}