Basic HTML version of Foils prepared 19 September 98

Foil 45 Examples of Collective Communication/Computation

From MPI Message Passing Interface Computational Science for Simulations -- Fall Semester 1998. by Geoffrey C. Fox, Nancy McCracken
1 Four Processors where each has a send buffer of size 2
  • 0 1 2 3 Processors
  • (2,4) (5,7) (0,3) (6,2) Initial Send Buffers
  • MPI_BCAST with root=2
  • (0,3) (0,3) (0,3) (0,3) Resultant Buffers
  • MPI_REDUCE with action MPI_MIN and root=0
  • (0,2) (_,_) (_,_) (_,_) Resultant Buffers
  • MPI_ALLREDUCE with action MPI_MIN and root=0
  • (0,2) (0,2) (0,2) (0,2) Resultant Buffers
  • MPI_REDUCE with action MPI_SUM and root=1
  • (_,_) (13,16) (_,_) (_,_) Resultant Buffers
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