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There are a
number of important routines for monitoring
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and controlling
an MPI environment .
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MPI_INIT(ierr),MPI_Init(&argc,&argv)
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This initialises the MPI environment
e.g setting up node
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id..
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MPI_INITIALIZED(flag,ierr)
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This tells whether MPI_INIT has been
called or not.
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MPI_COMM_SIZE(comm,size.ierr)
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This returns the total number of
processors in the
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communicator
‘comm’
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MPI_COMM_RANK(comm,rank,ierr)
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This returns the rank of the processor
on which it is
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called.
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