An MPI program defines a set of processes, each executing the same program (SPMD)
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(usually one process per parallel computer node)
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... that communicate by calling MPI messaging functions
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(point-to-point and collective)
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... and can be constructed in a modular fashion
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(communication contexts are the key to MPI libraries)
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Also
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Support for Process Groups -- messaging in subsets of processors
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Support for application dependent (virtual) topologies analogous to distribution types in HPF
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Inquiry routines to find out properties of the environment such as number of processors
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