Basic HTML version of Foils prepared August 29 98

Foil 34 Types of Variables

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 Start with access patterns
  • Read Only -- disposition elsewhere
  • Write then Read -- possibly local
  • Read then Write -- independent or reductions
  • Written -- live on exit?
2 Goal: determine storage classes
  • Local or private variables are local per thread
  • Shared variables are everything else
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