Basic HTML version of Foils prepared August 29 98

Foil 32 Time for Finite Difference

From Designing and Building Parallel Programs I: Introduction DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel
1 Identical computations at each grid point
  • Tcomp = tcN2Z (tc is compute time/point)
2 1-D decomposition, so each node sends 2NZ data to 2 neighbors [if ? 2 rows/node]
  • Tcomm = P(ts2 + tw4NZ)
3 No significant idle time if load balanced
  • Tidle = 0
4 Therefore, T = tcN2Z/P + ts2 + tw4NZ
in Table To:

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