Basic HTML version of Foils prepared August 29 98

Foil 49 Typical Parallel Bugs (3)

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: inconsistently synchronized I/O stmts
  • Symptom: jumbled output, system error messages
  • Fix: critical/ordered section around I/O
2 Problem: inconsistent declarations of common vars
  • Symptom: segment violation
  • Fix: verify consistent declaration
3 Problem: parallel stack size problems
  • Symptom: core dump
  • Fix: increase stack size
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