Basic HTML version of Foils prepared August 29 98

Foil 26 Synchronization

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
MPI_Barrier(comm)
  • Blocks until all processes in communicator comm call it
Useful for producing meaningful timings
  • If processors are not synched before the timing, benchmarks may show negative-time messages
Typically, synchronization comes from messages themselves

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