MPI messages consist of two basic parts: the data being sent/received,
and an envelope of information that helps to route the data. There are usually
- three calling parameters
in MPI message-passing calls that describe the data
being sent/received
(startbuf, count, datatype)
-
and another three parameters that specify the routing
(destination/source, tag, communicator).
Example:
MPI_Send ( message, 13, MPI_CHAR, i, type, MPI_COMM_WORLD );
MPI_Recv ( message, 20, MPI_CHAR, 0, type, MPI_COMM_World, &status);
