2014 | OriginalPaper | Buchkapitel
Speed-Scaling with No Preemptions
verfasst von : Evripidis Bampis, Dimitrios Letsios, Giorgio Lucarelli
Erschienen in: Algorithms and Computation
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We revisit the non-preemptive speed-scaling problem, in which a set of jobs have to be executed on a single or a set of parallel speed-scalable processor(s) between their release dates and deadlines so that the energy consumption to be minimized. We adopt the speed-scaling mechanism first introduced in [Yao et al., FOCS 1995] according to which the power dissipated is a convex function of the processor’s speed. Intuitively, the higher is the speed of a processor, the higher is the energy consumption. For the single-processor case, we improve the best known approximation algorithm by providing a
$$(1+\epsilon )^{\alpha }\tilde{B}_{\alpha }$$
-approximation algorithm, where
$$\tilde{B}_{\alpha }$$
is a generalization of the Bell number. For the multiprocessor case, we present an approximation algorithm of ratio
$$\tilde{B}_{\alpha }((1+\epsilon )(1+\frac{w_{\max }}{w_{\min }}))^{\alpha }$$
improving the best known result by a factor of
$$(\frac{5}{2})^{\alpha -1}(\frac{w_{\max }}{w_{\min }})^{\alpha }$$
. Notice that our result holds for the fully heterogeneous environment while the previous known result holds only in the more restricted case of parallel processors with identical power functions.