Scripted HTML version of Foils prepared 11 November 1996

Foil 12 More 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 93.6
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_SENDRECV with 0,1 and 2,3 paired
(5,7) (2,4) (6,2) (0,3) Resultant Buffers
MPI_GATHER with root=0
(2,4,5,7,0,3,6,2) (_,_) (_,_) (_,_) Resultant Buffers
Four Processors where only rank=0 has send buffer
(2,4,5,7,0,3,6,2) (_,_) (_,_) (_,_) Initial send Buffers
MPI_SCATTER with root=0
(2,4) (5,7) (0,3) (6,2) Resultant Buffers

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