Typical Parallel Bugs (3)

• Problem: inconsistently synchronized I/O stmts

  Symptom: jumbled output, system error messages
  
  Fix: critical/ordered section around I/O

• Problem: inconsistent declarations of common vars

  Symptom: segment violation
  
  Fix: verify consistent declaration

• Problem: parallel stack size problems

  Symptom: core dump
  
  Fix: increase stack size

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