Scripted HTML version of Foils prepared 11 November 1996
Foil 15 Hello World in C plus MPI
From CPS615-Initial Lecture on MPI ending with discussion of basic MPI_SEND Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 31 October 96. byGeoffrey C. Fox * Secs 115.2
#include <stdio.h>
#include <mpi.h>
void main(int argc,char *argv[])
{
int ierror, rank, size
MPI_Init(&argc, &argv); # Initialize
MPI_Comm_rank(MPI_COMM_WORLD, &rank); # Find Processor Number
if( rank == 0)
printf ("hello World!\n");
ierror=MPI_Comm_size(MPI_COMM_WORLD, &size);
if( ierror != MPI_SUCCESS ) # Find Total number of processors above
MPI_Abort(MPI_COMM_WORLD,ierror); # Abort
printf("I am processor %d out of total of %d\n", rank, size);
Secs 115.2
