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On the Fine-Grained Parameterized Complexity of Partial Scheduling to Minimize the Makespan

Authors Jesper Nederlof, Céline M. F. Swennenhuis

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Author Details

Jesper Nederlof
  • Utrecht University, Algorithms and Complexity Group, The Netherlands
Céline M. F. Swennenhuis
  • Eindhoven University of Technology, Combinatorial Optimization Group, The Netherlands

Funding

  • Nederlof, Jesper: ERC project no. 617951. and no. 853234. and NWO project no. 024.002.003.
  • Swennenhuis, Céline M. F.: NWO project no. 613.009.031b, ERC project no. 617951.

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Jesper Nederlof and Céline M. F. Swennenhuis. On the Fine-Grained Parameterized Complexity of Partial Scheduling to Minimize the Makespan. In 15th International Symposium on Parameterized and Exact Computation (IPEC 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 180, pp. 25:1-25:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.IPEC.2020.25

Abstract

We study a natural variant of scheduling that we call partial scheduling: In this variant an instance of a scheduling problem along with an integer k is given and one seeks an optimal schedule where not all, but only k jobs, have to be processed.
Specifically, we aim to determine the fine-grained parameterized complexity of partial scheduling problems parameterized by k for all variants of scheduling problems that minimize the makespan and involve unit/arbitrary processing times, identical/unrelated parallel machines, release/due dates, and precedence constraints. That is, we investigate whether algorithms with runtimes of the type f(k)n^𝒪(1) or n^𝒪(f(k)) exist for a function f that is as small as possible.
Our contribution is two-fold: First, we categorize each variant to be either in 𝖯, NP-complete and fixed-parameter tractable by k, or 𝖶[1]-hard parameterized by k. Second, for many interesting cases we further investigate the run time on a finer scale and obtain run times that are (almost) optimal assuming the Exponential Time Hypothesis. As one of our main technical contributions, we give an 𝒪(8^k k(|V|+|E|)) time algorithm to solve instances of partial scheduling problems minimizing the makespan with unit length jobs, precedence constraints and release dates, where G = (V,E) is the graph with precedence constraints.

Subject Classification

ACM Subject Classification
  • Theory of computation → Parameterized complexity and exact algorithms
Keywords
  • Fixed-Parameter Tractability
  • Scheduling
  • Precedence Constraints

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