Basic HTML version of Foils prepared 13 February 2000

Foil 25 Reduce Communication

From Methodology of Computational Science CPS615 Computational Science -- Spring Semester 2000. by Geoffrey C. Fox
Consider a geometric problem with 4 processors
In top decomposition, we divide domain into 4 blocks with all points in a given block contiguous
In bottom decomposition we give each processor the same amount of work but divided into 4 separate domains
edge/area(bottom) = 2* edge/area(top)
So minimizing communication implies we keep points in a given processor together

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