Basic HTML version of Foils prepared August 29 98

Foil 33 Avoiding Buffering Costs

From Designing and Building Parallel Programs 3: MPI Message Passing System DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel
Copies are not needed if
  • Send does not return until the data is delivered,
  • or
  • The data is not touched after the send
MPI provides modes to arrange this
  • Synchronous: Do not return until recv is posted
  • Ready: Matching recv is posted before send
  • Buffered: If you really want buffering

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