Enforcing ω-Regular Properties in Markov Chains by Restarting

Authors Javier Esparza, Stefan Kiefer, Jan Křetínský, Maximilian Weininger



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Author Details

Javier Esparza
  • Technische Universität München, Germany
Stefan Kiefer
  • University of Oxford, UK
Jan Křetínský
  • Technische Universität München, Germany
Maximilian Weininger
  • Technische Universität München, Germany

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Javier Esparza, Stefan Kiefer, Jan Křetínský, and Maximilian Weininger. Enforcing ω-Regular Properties in Markov Chains by Restarting. In 32nd International Conference on Concurrency Theory (CONCUR 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 203, pp. 5:1-5:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)
https://doi.org/10.4230/LIPIcs.CONCUR.2021.5

Abstract

Restarts are used in many computer systems to improve performance. Examples include reloading a webpage, reissuing a request, or restarting a randomized search. The design of restart strategies has been extensively studied by the performance evaluation community. In this paper, we address the problem of designing universal restart strategies, valid for arbitrary finite-state Markov chains, that enforce a given ω-regular property while not knowing the chain. A strategy enforces a property φ if, with probability 1, the number of restarts is finite, and the run of the Markov chain after the last restart satisfies φ. We design a simple "cautious" strategy that solves the problem, and a more sophisticated "bold" strategy with an almost optimal number of restarts.

Subject Classification

ACM Subject Classification
  • Theory of computation → Verification by model checking
Keywords
  • Markov chains
  • omega-regular properties
  • runtime enforcement

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