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A task whose deadline equals its period and whose response time is 60 per cent of its period has a timing margin of

  • A.40 per cent of its period
  • B.60 per cent of its period
  • C.40 per cent of its execution time
  • D.no margin

Answer: A

The response time is what matters and it leaves four tenths of the period unused, which is the cushion against growth in the execution times above it. Expressing margins as a fraction of the period rather than of the execution time keeps them comparable between tasks.

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