Basic HTML version of Foils prepared August 29 98

Foil 18 Communication

From Designing and Building Parallel Programs I: Introduction DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel
Identify communication requirements
  • If computation in one task requires data located in another, communication is needed
Example: finite difference computation
Must communicate with each neighbor
Xi = (Xi-1 + 2*Xi + Xi+1)/4
X1
X2
X3
Partition creates
one task per point

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