Resource Constraints for Preemptive Job-shop Scheduling

  • Authors:
  • Claude Le Pape;Philippe Baptiste

  • Affiliations:
  • Bouygues, Direction Scientifique, 1, avenue Eugène Freyssinet, 78061 Saint-Quentin-en-Yvelines, France;UMR CNRS 6599 Heudiasyc, Université de Technologie de Compiègne, France

  • Venue:
  • Constraints
  • Year:
  • 1998

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Abstract

This paper presentsan experimental study of constraint propagation algorithms forpreemptive scheduling. We propose generalizations of non-preemptiveconstraint propagation techniques (based on timetables, on disjunctiveconstraints, and on edge-finding) to preemptive and ’’mixed‘‘problems, i.e., problems in which some activities can be interruptedand some cannot. Another approach relies on incremental flow-basedtechniques. We theoretically compare these approaches and presentan experimental comparison based on a branch and bound procedurefor the preemptive variant of the job-shop scheduling problem.We show that both edge-finding and flow-based techniques allowthe resolution of hard problem instances, including the preemptivevariant of the famous FT10.