Basic HTML version of Foils prepared Oct 26,97

Foil 15 Some Performance Results of Interest from Salmon and Warren

From Master Set of Foils for GEM Computational Science Presentation GEM Workshop Santa Fe -- October 24-25 1997. 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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