Basic HTML version of Foils prepared 19 September 1997

Foil 75 Implication of Hardware Performance

From Master Set of Foils for 1997 Session of CPS615 CPS615 Basic Simulation Track for Computational Science -- Fall Semester 97. by Geoffrey C. Fox
1 tcomm = 4 or 8 /Speed in Mbytes sec
  • as 4 or 8 bytes in a floating point word
2 tfloat = 1/Speed in Mflops per sec
3 Thus tcomm / tfloat is just 4 X Computation Speed divided by Communication speed
4 tcomm / tfloat is 26.7, 85, 1.5, 9.35, 8, 5, 25.6, 8 for the machines SP2, iPSC860, Paragon, KSR-1, Meiko CS2, Parsytec GC, TMC CM5, and Cray T3D respectively
5 Latency makes situation worse for small messages and double for 64bit arithmetic natural on large problems!
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