Abstract
This paper studies the problem of online job scheduling in a model with preemption penalty introduced by Zheng et al. [11]. In such a model with preemption penalty parameter ρ, the scheduler has to pay a penalty of ρ times the weight of each aborted job. We consider two cases according to the scheduler’s knowledge of Δ (ratio of length between longest and shortest jobs). In the first case where the exact value of Δ is known at the beginning, we re-investigate the WAL algorithm of Zheng et al. and prove that it is ((1 + ρ)Δ + o(Δ))-competitive for sufficiently large Δ. In particular, when ρ= 1, the previous competitive ratio of 3Δ + o(Δ) proved in [11] is improved to 2Δ + o(Δ). In the second case where the online strategy only knows beforehand that Δ ≥ k 3(ρ + 1)3 for some parameter k > 1, a \((\frac{k(1+\rho)}{k-1}\Delta+o(\Delta))\)-competitive deterministic strategy is presented. For large Δ, the competitive ratio approaches that of WAL as k increases.
The work is partially supported by NSF grants of China no. 70525004, 70702030 and 60736027, and Doctoral Fund of Ministry of Education of China (no. 20070698053).
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Zheng, F., Xu, Y., Poon, C.K. (2009). On Job Scheduling with Preemption Penalties . In: Goldberg, A.V., Zhou, Y. (eds) Algorithmic Aspects in Information and Management. AAIM 2009. Lecture Notes in Computer Science, vol 5564. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02158-9_27
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DOI: https://doi.org/10.1007/978-3-642-02158-9_27
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