Scripted HTML version of Foils prepared 11 November 1996

Foil 11 Examples of Collective Communication/Computation

From CPS615-Completion of MPI foilset and Application to Jacobi Iteration in 2D Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 7 November 96. by Geoffrey C. Fox *
Secs 168.4
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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