Basic HTML version of Foils prepared 10 Oct 1995

Foil 31 More 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_SENDRECV with 0,1 and 2,3 paired
5 (5,7) (2,4) (6,2) (0,3) Resultant Buffers
6 MPI_GATHER with root=0
7 (2,4,5,7,0,3,6,2) (_,_) (_,_) (_,_) Resultant Buffers
8 Four Processors where only rank=0 has send buffer
9 (2,4,5,7,0,3,6,2) (_,_) (_,_) (_,_) Initial send Buffers
10 MPI_SCATTER with root=0
11 (2,4) (5,7) (0,3) (6,2) Resultant Buffers
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© on Tue Oct 7 1997