Makespan minimization for two parallel machines scheduling with a periodic availability constraint

  • Authors:
  • Dehua Xu;Zhenmin Cheng;Yunqiang Yin;Hongxing Li

  • Affiliations:
  • School of Mathematical Sciences, Beijing Normal University, Beijing 100875, China;School of Mathematical Sciences, Beijing Normal University, Beijing 100875, China;School of Mathematical Sciences, Beijing Normal University, Beijing 100875, China;School of Electronic and Information Engineering, Dalian University of Technology, Dalian 116024, China

  • Venue:
  • Computers and Operations Research
  • Year:
  • 2009

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Abstract

A two parallel machines scheduling problem where one machine is periodically unavailable with the objective of minimizing makespan is considered. It is showed that the worst-case ratio of the classical LPT algorithm and the competitive ratio of the LS algorithm are 3/2 and 2, respectively, for the offline version and the online version of the problem.