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Optimise the serial
code in such a way that it
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exploits shared
memory features optimally. Then
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run MPI with one
processor per node.
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Run MPI with as
many processors as required.
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From the mynode assignments create new
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communicators as
follows: group all processors
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on a fiven node
into a communicator. Then
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create a
collective communicator with one
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processor from
each node.
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