Basic HTML version of Foils prepared August 29 98

Foil 25 Collective Communication

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 Provides standard interfaces to common global operations
  • Communications: broadcast
  • Computation: summation
2 A collective operation uses a process group
  • All processes in group call same operation at (roughly) the same time
3 Message tags not needed (generated internally)
in Table To:

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