LIPIcs.CONCUR.2015.456.pdf
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Unfolding-based Partial Order Reduction
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26th International Conference on Concurrency Theory (CONCUR 2015)
Series: Leibniz International Proceedings in Informatics (LIPIcs)
Conference: International Conference on Concurrency Theory (CONCUR) - License:
Creative Commons Attribution 3.0 Unported license
- Publication Date: 2015-08-26
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César Rodríguez, Marcelo Sousa, Subodh Sharma, and Daniel Kroening. Unfolding-based Partial Order Reduction. In 26th International Conference on Concurrency Theory (CONCUR 2015). Leibniz International Proceedings in Informatics (LIPIcs), Volume 42, pp. 456-469, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2015)
https://doi.org/10.4230/LIPIcs.CONCUR.2015.456
https://doi.org/10.4230/LIPIcs.CONCUR.2015.456
Abstract
Partial order reduction (POR) and net unfoldings are two alternative methods to tackle state-space explosion caused by concurrency. In this paper, we propose the combination of both approaches in an effort to combine their strengths. We first define, for an abstract execution model, unfolding semantics parameterized over an arbitrary independence relation. Based on it, our main contribution is a novel stateless POR algorithm that explores at most one execution per Mazurkiewicz trace, and in general, can explore exponentially fewer, thus achieving a form of super-optimality. Furthermore, our unfolding-based POR copes with non-terminating executions and incorporates state caching. On benchmarks with busy-waits, among others, our experiments show a dramatic reduction in the number of executions when compared to a state-of-the-art DPOR.
Keywords
- Partial order reduction
- unfoldings
- concurrency
- model checking
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