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Deadline monotonic assignment differs from rate monotonic in ordering by

  • A.the absolute deadline, recomputed at each release
  • B.the utilisation of each task
  • C.the relative deadline rather than the period
  • D.the execution time rather than the period

Answer: C

Correct answer: the relative deadline rather than the period

Where a deadline equals its period the two schemes coincide. They differ when a deadline is shorter, and deadline monotonic is then the optimal fixed priority assignment while rate monotonic is not - a task needing its answer quickly should be prioritised on that need rather than on how often it runs.

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