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What are the performance problems with AMPI packing and unpacking?

April 26, 2017packing PERFORMANCE problems unpacking

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What are the performance problems with AMPI packing and unpacking?

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There is an extra copy involved, because the AMPI message is reusable immediately after the AMPI call returns. Since Charm++ messages are to be handed over to the system, there is an extra copy involved (plus creation of a Charm++ message) while sending.