Basic HTML version of Foils prepared 10 Oct 1995

Foil 30 Examples of Collective Communication/Computation

From Fox Presentation Fall 1995 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95. by Geoffrey C. Fox
1 Four Processors where each has a send buffer of size 2
2 0 1 2 3 Processors
3 (2,4) (5,7) (0,3) (6,2) Initial Send Buffers
4 MPI_BCAST with root=2
5 (0,3) (0,3) (0,3) (0,3) Resultant Buffers
6 MPI_REDUCE with action MPI_MIN and root=0
7 (0,2) (_,_) (_,_) (_,_) Resultant Buffers
8 MPI_ALLREDUCE with action MPI_MIN and root=0
9 (0,2) (0,2) (0,2) (0,2) Resultant Buffers
10 MPI_REDUCE with action MPI_SUM and root=1
11 (_,_) (13,16) (_,_) (_,_) Resultant Buffers
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© on Tue Oct 7 1997