Basic HTML version of Foils prepared August 29 98

Foil 65 Irregular Mesh: OpenMP Mapping (2)

From Designing and Building Parallel Programs 2: openMP Shared Memory Programming Language DoD Modernization Tutorial -- 1995-1998. by Ian Foster, Gina Goff, Ehtesham Hayder, Chuck Koelbel(Some foils prepared by Kuck & Associates, Inc.)
The reality:
  • The graph is connected ? some endpoints must be shared
  • Memory systems move more than one word at a time ? false sharing
  • OpenMP does not standardize how to resolve this
    • Best bet: Once the program is working, look for good orderings of data

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