Groups, Context and Communicators
[End-User Documentation]

Collaboration diagram for Groups, Context and Communicators:

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Detailed Description

The MOC communicator specifies a group of processes inside which a communication occurs.

Initially there is a single communicator, MPI_COMM_WORLD, which contains all of the processes involved in the computation.

Currently there is no support for creating and managing user-defined groups and communicators and probably never will be. The local storage of a SPU is very small and also the maximal number of nodes is limited to a small number and so there is doubt if the benefits will be greater than the overhead introduced by supporting user-defined groups and communicators.

Only the predefined communicators MOC_COMM_WORLD, MOC_COMM_SELF and MOC_COMM_NULL are available.

The only operations which are currently implemented are MOC_Comm_size and MOC_Comm_rank.

Modules
	Communicator Management
	Funktions for managing communicators.