Basic HTML version of Foils prepared 5 October 98

Foil 36 Scaling Ideas in GEM

From Earthquake Prediction as Example of N Body Computations CPS615 INtroduction to Computational Science -- Fall Semester 1998. by Geoffrey C. Fox
1 Note that tree codes are a simple example of general need in GEM to have technologies that bridge different physical scales
  • This is well known for multigrid approach to elliptic partial differential equation solvers
2 Information travels in O(1 or log K) steps and not K steps for a grid of size K
  • Multipole method implements this type of fast traversal of multiple scales with its variable grid size. A uniform grid is dominated by small distances even if irrelevant
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