Compositional State Space Reduction Using Untangled Actions

  • Authors:
  • Xu Wang;Marta Kwiatkowska

  • Affiliations:
  • School of Computer Science, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK;School of Computer Science, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

  • Venue:
  • Electronic Notes in Theoretical Computer Science (ENTCS)
  • Year:
  • 2007

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Abstract

We propose a compositional technique for efficient verification of networks of parallel processes. It is based on an automatic analysis of LTSs of individual processes (using a failure-based equivalence which preserves divergences) that determines their sets of ''conflict-free'' actions, called untangled actions. Untangled actions are compositional, i.e. synchronisation on untangled actions will not destroy their ''conflict-freedom''. For networks of processes, using global untangled actions derived from local ones, efficient reduction algorithms have been devised for systems with a large number of small processes running in parallel.