HTML version of Scripted Foils prepared 11 November 1996

Foil 20 Implication of Hardware Performance

From CPS615-Lecture on Computer Architectures and Networks Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 12 September 96. by Geoffrey C. Fox *
Secs 87.8
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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