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Under transient overload a fixed priority system fails

  • A.completely, every task missing its deadline together
  • B.not at all, fixed priorities being immune to overload
  • C.predictably, the lowest priority tasks missing first
  • D.unpredictably, any task being liable to miss

Answer: C

Correct answer: predictably, the lowest priority tasks missing first

A fixed priority scheme degrades in a known order, since the high priority tasks continue to preempt and the shortfall falls on those at the bottom. That predictability is a real advantage: the critical work can be placed high and will survive an overload that the rest does not.

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