Basic HTML version of Foils prepared August 29 98

Foil 28 Bandwidth and Latency

From Designing and Building Parallel Programs I: Introduction DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel
1 Recall cost model
  • T = ts + N tw
  • ts = per-message cost ("latency")
  • tw = per-word cost (1/ tw = bandwidth)
  • N = message size in words
2 Model works well for many algorithms, and on many computers
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