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Counters

• Count or summarize specified events.
  • Number of procedure calls, number of messages, volume of messages, ....
• Generation:
  • Compiler-generated code.
  • Code in communication libraries.
  • User-inserted calls.
• Information not be obtained by sampling.
• Variant: interval timer.
  • Length of time spent executing particular pieces of code.
  • Accurate determination of time spent in program component.
• Disadvantage: code modifications.