Basic HTML version of Foils prepared 19 September 98

Foil 41 Collective Communication

From MPI Message Passing Interface Computational Science for Simulations -- Fall Semester 1998. by Geoffrey C. Fox, Nancy McCracken
1 Provides standard interfaces to common global operations
  • Synchronization
  • Communications, i.e. movement of data
  • Collective computation
2 A collective operation uses a process group
  • All processes in group call same operation at (roughly) the same time
  • Groups are constructed "by hand" with MPI group manipulation routines or by using MPI topology-definition routines
3 Message tags not needed (generated internally)
4 All collective operations are blocking.
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