On combining state space reductions with global fairness assumptions

  • Authors:
  • Shao Jie Zhang;Jun Sun;Jun Pang;Yang Liu;Jin Song Dong

  • Affiliations:
  • National University of Singapore;Singapore University of Technology and Design;University of Luxembourg;National University of Singapore;National University of Singapore

  • Venue:
  • FM'11 Proceedings of the 17th international conference on Formal methods
  • Year:
  • 2011

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Abstract

Model checking has established itself as an effective system analysis method, as it is capable of proving/dis-proving properties automatically. Its application to practical systems is however limited by state space explosion. Among effective state reduction techniques are symmetry reduction and partial order reduction. Global fairness often plays a vital role in designing self-stabilizing population protocols. It is known that combining fairness and symmetry reduction is nontrivial. In this work, we first show that global fairness, unlike weak/strong fairness, can be combined with symmetry reduction. We extend the PAT model checker with the technique and demonstrate its usability by verifying recently proposed population protocols. Second, we show that partial order reduction is not property-preserving with global fairness.