mpi-hello.c

#include "mpi.h"
#include "stdio.h"

int main(int argc, char **argv) {
  MPI_Init(&argc, &argv);

  int totalRanks, myRank, nameLen;
  char myName[MPI_MAX_PROCESSOR_NAME];

  MPI_Comm_rank(MPI_COMM_WORLD, &myRank);
  MPI_Comm_size(MPI_COMM_WORLD, &totalRanks);
  MPI_Get_processor_name(myName, &nameLen);

  printf("Hello world from process %d of %d, on %s\n", myRank, totalRanks, myName);

  MPI_Finalize();
  return 0;
}