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A task with a 1 ms period and a 100 cycle switch overhead on a 48 MHz core loses to switching about

  • A.0.4 per cent of the processor
  • B.4 per cent of the processor
  • C.0.04 per cent of the processor
  • D.10 per cent of the processor

Answer: A

Two hundred cycles per millisecond is two hundred thousand cycles a second out of forty-eight million, a little over four parts in a thousand. Ten such tasks would cost four per cent, which is when the correction starts to matter.

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