Job shop scheduling with setup times and maximal time-lags: a simple constraint programming approach

  • Authors:

  • Diarmuid Grimes;Emmanuel Hebrard

  • Affiliations:

  • Cork Constraint Computation Centre & University College Cork, Ireland;,Cork Constraint Computation Centre & University College Cork, Ireland

  • Venue:
  • CPAIOR'10 Proceedings of the 7th international conference on Integration of AI and OR Techniques in Constraint Programming for Combinatorial Optimization Problems
  • Year:
  • 2010

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Abstract

In previous work we introduced a simple constraint model that combined generic AI strategies and techniques (weighted degree heuristic, geometric restarts, nogood learning from restarts) with naive propagation for job shop and open shop scheduling problems. Here, we extend our model to handle two variants of the job shop scheduling problem: job shop problems with setup times; and job shop problems with maximal time lags. We also make some important additions to our original model, including a solution guidance component for search. We show empirically that our new models often outperform the state of the art techniques on a number of known benchmarks for these two variants, finding a number of new best solutions and proving optimality for the first time on some problems. We provide some insight into the performance of our approach through analysis of the constraint weighting procedure.