Transactions of the Japanese Society for Artificial Intelligence
Online ISSN : 1346-8030
Print ISSN : 1346-0714
Short Paper
Speedup of OWCTY Model Checking Algorithm Using Strongly Connected Components
Toshiki KAWABATAFumiyoshi KOBAYASHIKazunori UEDA
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2011 Volume 26 Issue 2 Pages 341-346


Model checking is an exhaustive search method of verification. Automata-based LTL model checking is one of the methods to solve accepting cycle search problems. Model checking is prone to state-space explosion, and we may expect that parallel processing would be a promising approach. However, the optimal sequential algorithm is based on post-order depth-first seach and is difficult to parallelize. Alternative parallel algorithms have been proposed, and OWCTY_reversed is one of them. OWCTY_reversed is known to be a stable and fast algorithm for models that accept some words, but it does not use the characteristics of the automata used in LTL model checking. We propose a new algorithm named SCC-OWCTY that exploits the SCCs (strongly connected components) of property automata. The algorithm removes states that are judged not to form accepting cycles faster than OWCTY_reversed. We experimented and compared the two algorithms using DiVinE, and confirmed improvements both in performance and scalability.

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© 2011 JSAI (The Japanese Society for Artificial Intelligence)
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