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Nested Active-Time Scheduling

Authors Nairen Cao, Jeremy T. Fineman, Shi Li, Julián Mestre, Katina Russell, Seeun William Umboh

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Author Details

Nairen Cao
  • Georgetown University, Washington D.C., USA
Jeremy T. Fineman
  • Georgetown University, Washington D.C., USA
Shi Li
  • University at Buffalo, NY, USA
Julián Mestre
  • The University of Sydney, Australia
Katina Russell
  • Georgetown University, Washington D.C., USA
Seeun William Umboh
  • The University of Sydney, Australia

Cite AsGet BibTex

Nairen Cao, Jeremy T. Fineman, Shi Li, Julián Mestre, Katina Russell, and Seeun William Umboh. Nested Active-Time Scheduling. In 33rd International Symposium on Algorithms and Computation (ISAAC 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 248, pp. 36:1-36:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)
https://doi.org/10.4230/LIPIcs.ISAAC.2022.36

Abstract

The active-time scheduling problem considers the problem of scheduling preemptible jobs with windows (release times and deadlines) on a parallel machine that can schedule up to g jobs during each timestep. The goal in the active-time problem is to minimize the number of active steps, i.e., timesteps in which at least one job is scheduled. In this way, the active time models parallel scheduling when there is a fixed cost for turning the machine on at each discrete step. This paper presents a 9/5-approximation algorithm for a special case of the active-time scheduling problem in which job windows are laminar (nested). This result improves on the previous best 2-approximation for the general case.

Subject Classification

ACM Subject Classification
  • Theory of computation → Scheduling algorithms
Keywords
  • Scheduling algorithms
  • Active time
  • Approximation algorithm

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