Basic HTML version of Foils prepared 14 October 1997

Foil 63 Very Bad Naive Message Parallel Algorithm

From Fox Presentation Fall 1995 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 95/96/97. by Nancy McCracken and Geoffrey C. Fox
For each i in each processor, set MPGrav(i) =0
We will implement a naive "owner's-compute rule" algorithm where MPGrav(i) is calculated in processor that is home to i
Now loop over over j= 1...N (j ¹ i)
When j is stored in processor holding i, increment MPGrav(i) by contribution due to j
When j stored in a different processor, communicate Xuse(j),M(j) and increment MPGrav(i)

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