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A task set whose utilisation lies above the rate monotonic bound but below 1.0 is

  • A.schedulable only if all the periods are harmonic multiples
  • B.possibly schedulable, the test being sufficient but not necessary
  • C.certainly unschedulable under rate monotonic
  • D.certainly schedulable under rate monotonic

Answer: B

The bound guarantees schedulability below it and says nothing above it, so a set at 0.85 with three tasks needs the exact test. Harmonic periods are a special case in which utilisation up to 1.0 is schedulable under rate monotonic.

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