Hello World:C Example of Send and Receive

• # All processes execute this program

• #include “mpi.h”

• main( int argc, char **argv )

• {

  • char message[20];
  • int i, rank, size, tag=137; # Any value of tag allowed
  • MPI_Status status;
  • MPI_Init (&argc, &argv);
  • MPI_Comm_size(MPI_COMM_WORLD, &size) # Number of Processes
  • MPI_Comm_rank(MPI_COMM_WORLD, &rank); # Who is this process

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