Basic HTML version of Foils prepared 5 October 98

Foil 16 Some Performance Results of Interest from Salmon and Warren

From Earthquake Prediction as Example of N Body Computations CPS615 INtroduction to Computational Science -- Fall Semester 1998. by Geoffrey C. Fox
1 16 Pentium Pro's in a cluster (cost $30K today) reach about 1 gigaflop on a tree code with 107 particles
2 6800 Pentium Pro's (ASCI Sandia machine) with around 300 million particles
  • 600 gigaflops with simple O(N2) code
  • 400 gigaflops with tree code
3 But tree code is 105 times as efficient as O(N2) code on this problem
  • i.e if Execution Time(naïve code) is c . N2
  • then Time (tree code) is 3000 c N
  • and tree code is more efficient than O(N2) code for more than 3000 particles
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