Separate Focus HTML for Basic Foil 28 Hello World:C Example of Broadcast

Basic HTML version of Foils prepared 10 Oct 1995

Foil 28 Hello World:C Example of Broadcast

From Fox Presentation Fall 1995 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95. by Geoffrey C. Fox

1	#include "mpi.h"
2	main( int argc, char argv )**
3	{ char message[20]; int rank; MPI_Init (&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD, &rank); # Who is this processor if( rank == 0 ) # We are on "root" -- Processor 0 strcpy(message,"Hello MPI World"); # Generate message # MPI_Bcast sends from root=0 and receives on all other processors MPI_Bcast(message,20, MPI_CHAR, 0, MPI_COMM_WORLD); printf("This is a message from node %d saying %s\n", rank, message); MPI_Finalize();
4	}