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The race-to-idle strategy consists of

  • A.waking more often but doing less on each occasion
  • B.running at full speed and then sleeping as long as possible
  • C.running as slowly as the deadline permits and never sleeping
  • D.keeping the core at a fixed intermediate frequency at all times

Answer: B

Where the sleep mode is very much cheaper than the running mode, finishing quickly and sleeping wins even though the fast running consumes more power. Where leakage dominates and sleep saves little, running slowly at a low voltage wins instead.

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