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Conference Papers Year : 2012

Trace Spaces: an Efficient New Technique for State-Space Reduction


State-space reduction techniques, used primarily in model-checkers, all rely on the idea that some actions are independent, hence could be taken in any (respective) order while put in parallel, without changing the semantics. It is thus not necessary to consider all execution paths in the interleaving semantics of a concurrent program, but rather some equivalence classes. The purpose of this paper is to describe a new algorithm to compute such equivalence classes, and a representative per class, which is based on ideas originating in algebraic topology. We introduce a geometric semantics of concurrent languages, where programs are interpreted as directed topological spaces, and study its properties in order to devise an algorithm for computing dihomotopy classes of execution paths. In particular, our algorithm is able to compute a control-flow graph for concurrent programs, possibly containing loops, which is "as reduced as possible" in the sense that it generates traces modulo equivalence. A preliminary implementation was achieved, showing promising results towards efficient methods to analyze concurrent programs, with very promising results compared to partial-order reduction techniques.
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hal-00684615 , version 1 (02-04-2012)



Lisbeth Fajstrup, Eric Goubault, Emmanuel Haucourt, Samuel Mimram, Martin Raussen. Trace Spaces: an Efficient New Technique for State-Space Reduction. ESOP - 21st European Symposium on Programming, Mar 2012, Tallinn, Estonia. pp.274-294, ⟨10.1007/978-3-642-28869-2_14⟩. ⟨hal-00684615⟩


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