Basic HTML version of Foils prepared August 29 98

Foil 38 Competition for Bandwidth

From Designing and Building Parallel Programs I: Introduction DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel
In many cases, a bandwidth constrained model can give sufficiently accurate results
  • "If S processes must communicate over same wire at same time, each has 1/S bandwidth"
Example: finite difference on Ethernet
  • All processors share single Ethernet
  • Hence bandwidth term scaled by P
  • T = tcN2Z/P + ts2 + tw4NZP

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