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Two tasks have execution times 2 and 4 ms and periods 5 and 20 ms. The utilisation is

  • A.0.40
  • B.1.00
  • C.0.30
  • D.0.60

Answer: D

Two fifths is 0.4 and four twentieths is 0.2, giving 0.6 in all. That is comfortably below the two-task rate monotonic bound of 0.828, so the set is schedulable under fixed priorities without any further test, and the periods happen to be harmonic besides.

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