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Non-blocking
routines return immediately .
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• |
They do not wait
for the actual arrival of the message nor
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for the sending
protocols to be finished.
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The MPI library
performs these tasks whenever it is able
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to with the user
having no control.
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These routines
are intrinsically unsafe as there is the
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danger that the
application buffers may be modified by
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the program
without ascertaining whether the non-
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blocking
operation has been completed or not.
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Non-blocking
routines allow communications and
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computations to overlap .
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