Efficient algorithms for average completion time scheduling

  • Authors:
  • René Sitters

  • Affiliations:
  • Department of Econometrics and Operations Research, Free University, Amsterdam

  • Venue:
  • IPCO'10 Proceedings of the 14th international conference on Integer Programming and Combinatorial Optimization
  • Year:
  • 2010

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Abstract

We analyze the competitive ratio of algorithms for minimizing (weighted) average completion time on identical parallel machines and prove that the well-known shortest remaining processing time algorithm (SRPT) is 5/4-competitive w.r.t. the average completion time objective. For weighted completion times we give a deterministic algorithm with competitive ratio 1.791+o(m). This ratio holds for preemptive and non-preemptive scheduling.