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
1
MPI_Barrier(comm)
Blocks until all processes in communicator comm call it
2
Useful for producing meaningful timings
If processors are not synched before the timing, benchmarks may show negative-time messages
3
Typically, synchronization comes from messages themselves
in Table To:
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