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
1 Identify communication requirements
  • If computation in one task requires data located in another, communication is needed
2 Example: finite difference computation
3 Must communicate with each neighbor
4 Xi = (Xi-1 + 2*Xi + Xi+1)/4
5 X1
6 X2
7 X3
8 Partition creates
9 one task per point
in Table To:

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