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Communication Dans Un Congrès Année : 2016

Precedence-Constrained Scheduling Problems Parameterized by Partial Order Width

Résumé

Negatively answering a question posed by Mnich and Wiese (Math. Program. 154(1–2):533–562), we show that P2|prec,pj∈{1, 2}|Cmax, the problem of finding a non-preemptive minimum-makespan schedule for precedence-constrained jobs of lengths 1 and 2 on two parallel identical machines, is W[2]-hard parameterized by the width of the partial order giving the precedence constraints. To this end, we show that Shuffle Product, the problem of deciding whether a given word can be obtained by interleaving the letters of k other given words, is W[2]-hard param-eterized by k, thus additionally answering a question posed by Rizzi and Vialette (CSR 2013). Finally, refining a geometric algorithm due to Servakh (Diskretn. Anal. Issled. Oper. 7(1):75–82), we show that the more general Resource-Constraint Project Scheduling problem is fixed-parameter tractable parameterized by the partial order width combined with the maximum allowed difference between the earliest possible and factual starting time of a job.
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Dates et versions

hal-01495042 , version 1 (24-03-2017)

Identifiants

Citer

René van Bevern, Robert Bredereck, Laurent Bulteau, Christian J Komusiewicz, Nimrod Talmon, et al.. Precedence-Constrained Scheduling Problems Parameterized by Partial Order Width. DOOR 2016: Discrete Optimization and Operations Research, Sep 2016, Vladivostok, Russia. pp.345 - 120, ⟨10.1007/978-3-319-44914-2_9⟩. ⟨hal-01495042⟩
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