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Broadcasts a message from the process with rank root to all other processes of the group.
res = MPI_Bcast(value,rootID)
The value to be sent to all nodes.
The source of the message
The broadcasted value
Send a variable to all nodes. The value should be retrieved by the node with the function MPI_Recv.
On the internal technical side, two broadcasts are used transparently. The first one sends the size of the data, the second the data themself.
MPI_Init(); rnk = MPI_Comm_rank(); sizeNodes = MPI_Comm_size(); SLV = rnk; // handy shortcuts, master is rank 0 Master = ~ SLV; // slaves are all other a=-1 if Master // Declare a a=42 end b=MPI_Bcast(a, 0); assert_checkequal(b,42); MPI_Finalize();
- MPI_Recv — Recv data from a node