http://www.cnblogs.com/liyanwei/archive/2010/04/26/1721142.html

http://blog.csdn.net/yujiflying/article/details/7206961

//hello.c

#include "mpi.h"

#include <stdio.h>

#include <math.h>

int main (int argc, char **argv)

{

    int myid, numprocs;

    int namelen;

    char processor_name[MPI_MAX_PROCESSOR_NAME];

    MPI_Init (&argc, &argv);

    MPI_Comm_rank (MPI_COMM_WORLD, &myid);

    MPI_Comm_size (MPI_COMM_WORLD, &numprocs);

    MPI_Get_processor_name (processor_name, &namelen);

    fprintf (stderr, "Hello World! Process %d of %d on %s\n", myid, numprocs, processor_name);

    MPI_Finalize ();

    return 0;

}

mpicc -o hello hello.c

Hello World! Process 1 of 4 on jack-laptop

Hello World! Process 3 of 4 on jack-laptop

Hello World! Process 2 of 4 on jack-laptop

Hello World! Process 0 of 4 on jack-laptop