MPI_Bcast
Broadcasts a message from the process with rank root to all other processes of the group
Syntax
res = MPI_Bcast(value, rootID) res = MPI_Bcast(value, rootID, comm=mpi_comm)
Arguments
- value
The value to be sent to all nodes.
- rootID
The source of the message
- comm = mpi_comm
If the optional argument "comm" is given, this function will use the MPI communicator created by MPI_Create_comm. If not, the default MPI_COMM_WORLD is used.
- res
The broadcasted value. If the optional argument "comm" is given, all nodes which are not in the communicator will return empty matrix.
Description
Sends 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.
Examples
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); b == 42 MPI_Finalize();
See also
- MPI_Recv — Recv data from a node
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