Collective Communication
[End-User Documentation]

Collaboration diagram for Collective Communication:

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Detailed Description

Communication that involves a group of processes.

A collective operation is normally executed by having all processes in the group call the communication routine, with matching arguments. Since there are no means for creating groups currently implemented, the only available groups are MOC_COMM_WORLD and MOC_COMM_SELF.

Functions
int	MOC_Bcast (void *buffer, int count, MOC_Datatype datatype, int root, MOC_Comm comm)
	Broadcasts a message from the process with rank "root" to all other processes of the group.
int	MOC_Barrier (MOC_Comm comm)
	Blocks the caller until all processes in the communicator have called it; that is, the call returns at any process only after all members of the communicator have entered the call.

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Function Documentation

int MOC_Barrier

(

MOC_Comm

comm

)

Blocks the caller until all processes in the communicator have called it; that is, the call returns at any process only after all members of the communicator have entered the call.

Parameters:

comm

in communicator of message

Return values:

	MOC_SUCCESS	No error; MPI routine completed successfully.
	...	error-code

int MOC_Bcast	(	void *	buffer,
		int	count,
		MOC_Datatype	datatype,
		int	root,
		MOC_Comm	comm
	)

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

Note:

The broadcast-message can also be received by a MOC_Recv using MOC_BCAST_TAG.

Parameters:

	buffer	inout starting address of buffer
	count	in number of elements to be send or received
	datatype	in Type of elements to be send or received
	root	in rank of the process who sends the broadcast-message
	comm	in communicator of message