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MPI_Bcast

Broadcasts a message from the process with rank root to all other processes of the group.

Syntax

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

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.

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);
assert_checkequal(b,42);
MPI_Finalize();

See also


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