Basic HTML version of Foils prepared 5 October 98

Foil 22 Parallelism in O(N2) N Body Approach I

From Earthquake Prediction as Example of N Body Computations CPS615 INtroduction to Computational Science -- Fall Semester 1998. by Geoffrey C. Fox
1 O(N2) Algorithms are extremely efficient on parallel machines as
  • Load balancing guaranteed with equal numbers of particles in each node
  • Communication overhead goes like 1/(grain size n = number of particles in node) . Typical time to communicate word/ typical time to do floating computation) ~ 0.25(from algorithm details) . 10( = tcomm/tfloat)/n
  • So very efficient along as around 50 particles or more per processor
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