Broadcast

• Broadcast; the one-to-all broadcast operation is performed in MPI using the MPI_Bcast function.

  int MPI_Bcast(void *buf, int count, MPI_Datatype datatype, 
          int source, MPI_Comm comm)
  

• MPI_Bcast sends the data stored in the buffer buf of process source to all the other processes in the group.
• The data that is broadcast consist of count entries of type datatype.
• The data received by each process is stored in the buffer buf.
• Since the operations are virtually synchronous, they do not require tags.

Figure 1: Diagram for Broadcast.