Basic HTML version of Foils prepared 19 September 98

Foil 30 Hello World in C plus MPI

From MPI Message Passing Interface Computational Science for Simulations -- Fall Semester 1998. by Geoffrey C. Fox, Nancy McCracken
# all processes execute this program
#include <stdio.h>
#include <mpi.h>
void main(int argc,char *argv[])
{ int ierror, rank, size
  • MPI_Init(&argc, &argv); # Initialize
  • # In following Find Process Number
  • MPI_Comm_rank(MPI_COMM_WORLD, &rank);
  • if( rank == 0)
    • printf ("hello World!\n");
  • # In following, Find Total number of processes
  • ierror = MPI_Comm_size(MPI_COMM_WORLD, &size);
  • if( ierror != MPI_SUCCESS )
    • MPI_Abort(MPI_COMM_WORLD,ierror); # Abort
  • printf("I am processor %d out of total of %d\n", rank, size);
  • MPI_Finalize(); # Finalize }

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