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Comparing earliest deadline first with rate monotonic, the dynamic scheme's chief drawback is

  • A.a requirement that all periods be harmonic multiples
  • B.unpredictable behaviour under transient overload
  • C.a lower utilisation bound than the fixed priority scheme
  • D.an inability to schedule periodic tasks at all

Answer: B

Under overload a fixed priority system sheds the lowest priority tasks predictably, whereas earliest deadline first can miss deadlines across the whole set as everything becomes urgent at once. Its utilisation bound is the higher of the two, at unity.

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