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21967 Improved Multi-Core Nested Depth-First Search
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Evangelista, S. and Laarman, A.W. and Petrucci, L. and van de Pol, J.C. (2012) Improved Multi-Core Nested Depth-First Search. In: Proceedings of the 10th International Symposium on Automated Technology for Verification and Analysis, ATVA 2012, 3-6 Oct 2012, Thiruvananthapuram (Trivandrum), Kerala. pp. 269-283. Lecture Notes in Computer Science 7561. Springer Verlag. ISBN 978-3-642-33386-6

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This paper presents CNDFS, a tight integration of two earlier multi-core nested depth-first search (NDFS) algorithms for LTL model checking. CNDFS combines the different strengths and avoids some weaknesses of its predecessors. We compare CNDFS to an earlier ad-hoc combination of those two algorithms and show several benefits: It has shorter and simpler code and a simpler correctness proof. It exhibits more stable performance and scalability, while at the same time reducing memory requirements.
The algorithm has been implemented in the multi-core backend of the LTSmin model checker, which is now benchmarked for the first time on a 48 core machine (previously 16). The experiments demonstrate better scalability than other parallel LTL model checking algorithms, but we also investigate apparent bottlenecks.
Finally, we noticed that the multi-core NDFS algorithms produce shorter counterexamples, surprisingly often shorter than their BFS-based counterparts.

Item Type:Conference or Workshop Paper (Full Paper, Talk)
Research Group:EWI-FMT: Formal Methods and Tools
Research Program:CTIT-DSN: Dependable Systems and Networks
Research Project:CEDICT: 3TU Center of Excellence for ICT
Uncontrolled Keywords:multi-core, paralll, LTL model checking, liveness properties, verification, LTSmin, nested depth-first search, NDFS, CNDFS
ID Code:21967
Deposited On:17 July 2012
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