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Jitter in a periodic task is

  • A.the variation in the interval between successive executions
  • B.the delay between the interrupt arriving and its handler starting to run
  • C.the total time the task spends running each period
  • D.the number of deadlines missed over a long run

Answer: A

A task released every ten milliseconds but actually running between 9.7 and 10.4 has 0.7 milliseconds of jitter, which matters greatly to a control loop and not at all to a display update. Latency is the separate quantity measured from a triggering event.

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