HTML version of Scripted 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. by Geoffrey C. Fox *
Secs 115.2
1 #include <stdio.h>
2 #include <mpi.h>
3 void main(int argc,char *argv[])
4 {
  • 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);
  • MPI_Finalize(); # Finalize
5 }
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