Hello World:C Example of Broadcast

• #include "mpi.h"

• main( int argc, char **argv )

• { 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 processor
  • 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(); }

• Note that all processes issue the broadcast operation, process 0 sends the message and all processes receive the message.

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