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Race-to-idle is the better strategy when

  • A.the deadline is far longer than the computation needs
  • B.the supply voltage cannot be changed at all
  • C.the sleep current is very much lower than the running current
  • D.the leakage current is of the same order as the running current itself

Answer: C

The whole argument rests on sleep being nearly free, so that time spent asleep costs nothing and should be maximised. On a leaky part where sleeping saves little, the quadratic voltage saving from running slowly is worth more.

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