MPI sample

test.cpp

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

int
main(int argc, char **argv) {
  int rank = 0;
  MPI_Init(&argc, &argv);
  MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  if (0 == rank) {
    int send_value = 12345;
    MPI_Send(&send_value, 1, MPI_INT, 1, 0, MPI_COMM_WORLD);
  } else {
    class Hoge {
    private:
      int private_value;
    public:
      void recv() {
        MPI_Status st;
        MPI_Recv(&private_value, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, &st);
      }
      void show() {
        printf("my private value is %d\n", private_value);
      }
    };
    Hoge h;
    h.recv();
    h.show();
  }
  MPI_Finalize();
}

$ mpic++ test.cpp
$ mpirun -np 2 ./a.out 
my private value is 12345