Method MPI.Comm()->Recv()

Method Recv

void Recv(MPI.Pointer buf, int source, int|void tag, MPI.Status|void status)
void Recv(MPI.IntArray buf, int source, int|void tag, MPI.Status|void status)
void Recv(MPI.FloatArray buf, int source, int|void tag, MPI.Status|void status)
void Recv(MPI.SingleArray buf, int source, int|void tag, MPI.Status|void status)
void Recv(MPI.Sentinel buf, int source, int|void tag, MPI.Status|void status)

Description

Receives a message from source with matching tag into buf, storing the sender's rank and the tag used into the optionally given MPI.Status.

Note

The type of the buffer of the receiver site has to match the type of the buffer of the sender. Exception: If a string is sent, it has to be received into a MPI.Pointer.

Example

int main() {
	MPI.IntArray ia = MPI.IntArray(5);
 MPI.Init();
	write("This is rank %d, %d processes total.\n", MPI.world->rank,
	      MPI.world->size);
	if (MPI.world->rank) {
		for (int i = 0; i < sizeof(ia); i++) {
			ia[i] = MPI.world->rank + i;
		}
		MPI.world->Send(ia, 0); // send to rank 0
	} else {
		for (int i = 0; i < MPI.world->size; i++) {
			MPI.world->Recv(ia, i);
			write("Rank %d sent %O to rank 0.\n", i, (array)ia);
		}
	}
	MPI.Finalize();
	return 0;
}

See also

MPI.Comm->Send(), MPI.Comm->Bcast(), MPI.ANY_SOURCE, MPI.ANY_TAG, MPI_Send(3).