Basic HTML version of Foils prepared August 29 98

Foil 28 Multiple Parallel Loops

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.)
1 Nested parallel loops are good
  • Pick easiest or most parallel code
  • Think about locality
  • Use IF clause to select best based on dataset
  • Plan on doing one across clusters
2 Non nested parallel loops
  • Consider loop fusion (impacts locality)
  • Execute code between in parallel region
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