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DOI: 10.4230/LIPIcs.CONCUR.2015.456
Unfolding-based Partial Order Reduction

Authors: César Rodríguez, Marcelo Sousa, Subodh Sharma, and Daniel Kroening

Published in: LIPIcs, Volume 42, 26th International Conference on Concurrency Theory (CONCUR 2015)

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.
Cite as

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)

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@InProceedings{rodriguez_et_al:LIPIcs.CONCUR.2015.456,
  author =	{Rodr{\'\i}guez, C\'{e}sar and Sousa, Marcelo and Sharma, Subodh and Kroening, Daniel},
  title =	{{Unfolding-based Partial Order Reduction}},
  booktitle =	{26th International Conference on Concurrency Theory (CONCUR 2015)},
  pages =	{456--469},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-91-0},
  ISSN =	{1868-8969},
  year =	{2015},
  volume =	{42},
  editor =	{Aceto, Luca and de Frutos Escrig, David},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2015.456},
  URN =		{urn:nbn:de:0030-drops-53637},
  doi =		{10.4230/LIPIcs.CONCUR.2015.456},
  annote =	{Keywords: Partial order reduction, unfoldings, concurrency, model checking}
}
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