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A task's response time computed by iteration fails to converge. This indicates

  • A.the task has a deadline shorter than its period
  • B.the kernel's context switch time was omitted
  • C.the task set's utilisation is at or above unity
  • D.the priority assignment is not deadline monotonic

Answer: C

Correct answer: the task set's utilisation is at or above unity

The response time recurrence converges only while the utilisation of the task and everything above it is below one. If it is not, each iteration adds more interference than the last and the response time grows without limit - which is the analysis reporting that the set is unschedulable rather than failing.

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