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Reports (Research Report) Year : 2012

Energy-aware scheduling under reliability and makespan constraints


We consider a task graph mapped on a set of homogeneous processors. We aim at minimizing the energy consumption while enforcing two constraints: a prescribed bound on the execution time (or makespan), and a reliability threshold. Dynamic voltage and frequency scaling (DVFS) is an approach frequently used to reduce the energy consumption of a schedule, but slowing down the execution of a task to save energy is decreasing the reliability of the execution. In this work, to improve the reliability of a schedule while reducing the energy consumption, we allow for the re-execution of some tasks. We assess the complexity of the tri-criteria scheduling problem (makespan, reliability, energy) of deciding which task to re-execute, and at which speed each execution of a task should be done, with two different speed models: either processors can have arbitrary speeds (continuous model), or a processor can run at a finite number of different speeds and change its speed during a computation (VDD-hopping model). We propose several novel tri-criteria scheduling heuristics under the continuous speed model, and we evaluate them through a set of simulations. The two best heuristics turn out to be very efficient and complementary.
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Dates and versions

inria-00630721 , version 1 (10-10-2011)
inria-00630721 , version 2 (23-11-2011)
inria-00630721 , version 3 (03-02-2012)


  • HAL Id : inria-00630721 , version 3


Guillaume Aupy, Anne Benoit, Yves Robert. Energy-aware scheduling under reliability and makespan constraints. [Research Report] RR-7757, INRIA. 2012, pp.25. ⟨inria-00630721v3⟩
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