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1.2 Current Parallel Programming Paradigms - page 18 / 33

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Chapter 4

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Communicator modes

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This section defines the status of MPI processes and objects after a recovery operation. As a rule of thumb, all MPI objects containing non local infor- mation are destroyed and have to be re-established by the application. The following objects do not contain non-local information and will be therefore available on surviving processes after recovery:

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Datatypes (MPI Datatype)

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Operations (MPI Op)

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Error handlers (MPI Errhandler)

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Info objects (MPI Info, MPI-2)

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The following list shows the objects which are destroyed during the re- covery procedure:

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Groups (MPI Group)

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Communicators (MPI Comm)

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Windows (MPI Win, MPI-2)

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Files (MPI File, MPI-2)

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Requests are in this context ’special’ object, their behaviour is depending on the message mode and is explained in section 5. Windows and Files will be handled in more details in later versions of the specification.

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