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The reason periods are often chosen as harmonic multiples in a new design is that it

  • A.removes the need to assign priorities at all
  • B.eliminates every context switch from the system
  • C.allows the tasks to share a single stack
  • D.recovers the capacity the rate monotonic bound would otherwise cost

Answer: D

A harmonic set is schedulable under fixed priorities up to full utilisation, so the thirty per cent the general bound concedes is regained for nothing more than a choice of numbers. It is the cheapest capacity available to a designer.

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