In this paper we consider the parameterized complexity of two versions of a parallel machine scheduling problem with precedence delays, unit processing times and time windows. In the first version - with exact delays - we assume that the delay between two jobs must be exactly respected, whereas in the second version - with minimum delays - the delay between two jobs is a lower bound on the time between them. Two parameters are considered for this analysis: the pathwidth of the interval graph induced by the time windows and the maximum precedence delay value. We prove that our problems are para-NP-complete with respect to any of the two parameters and fixed-parameter tractable parameterized by the pair of parameters.
@InProceedings{mallem_et_al:LIPIcs.IPEC.2022.21, author = {Mallem, Maher and Hanen, Claire and Munier-Kordon, Alix}, title = {{Parameterized Complexity of a Parallel Machine Scheduling Problem}}, booktitle = {17th International Symposium on Parameterized and Exact Computation (IPEC 2022)}, pages = {21:1--21:21}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-260-0}, ISSN = {1868-8969}, year = {2022}, volume = {249}, editor = {Dell, Holger and Nederlof, Jesper}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.IPEC.2022.21}, URN = {urn:nbn:de:0030-drops-173774}, doi = {10.4230/LIPIcs.IPEC.2022.21}, annote = {Keywords: parameterized complexity, scheduling, precedence delays, pathwidth, chains, parallel processors} }
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