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A sporadic server is used to

  • A.remove the need for any schedulability analysis
  • B.bound the interference aperiodic work can cause the periodic tasks
  • C.raise the priority of aperiodic work above the periodic tasks
  • D.convert aperiodic arrivals into a strictly periodic stream

Answer: B

Correct answer: bound the interference aperiodic work can cause the periodic tasks

Aperiodic work has no period, so it cannot be included in a schedulability analysis as it stands. A sporadic server gives it a budget and a replenishment rule, so it behaves like a periodic task from the analysis’s point of view and its worst-case interference is known in advance.

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