Basic HTML version of Foils prepared August 29 98

Foil 47 Typical Parallel Bugs

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 Problem: incorrectly pointing to the same place
  • Symptom: bad answers
  • Fix: initialization of local pointers
2 Problem: incorrectly pointing to different places
  • Symptom: segmentation violation
  • Fix: localization of shared data
3 Problem: incorrect initialization of parallel regions
  • Symptom: bad answers
  • Fix: Copy in? / Use parallel region outside parallel do.
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