Approximate synchrony: An abstraction for distributed almost-synchronous systems
2015 (English)In: 27th International Conference on Computer Aided Verification, CAV 2015, Springer, 2015, 429-448 p.Conference paper (Refereed)Text
Forms of synchrony can greatly simplify modeling, design, and verification of distributed systems. Thus, recent advances in clock synchronization protocols and their adoption hold promise for system design. However, these protocols synchronize the distributed clocks only within a certain tolerance, and there are transient phases while synchronization is still being achieved. Abstractions used for modeling and verification of such systems should accurately capture these imperfections that cause the system to only be “almost synchronized.” In this paper, we present approximate synchrony, a sound and tunable abstraction for verification of almost-synchronous systems. We show how approximate synchrony can be used for verification of both time synchronization protocols and applications running on top of them. We provide an algorithmic approach for constructing this abstraction for symmetric, almost-synchronous systems, a subclass of almost-synchronous systems. Moreover, we show how approximate synchrony also provides a useful strategy to guide state-space exploration. We have implemented approximate synchrony as a part of a model checker and used it to verify models of the Best Master Clock (BMC) algorithm, the core component of the IEEE 1588 precision time protocol, as well as the time-synchronized channel hopping protocol that is part of the IEEE 802.15.4e standard.
Place, publisher, year, edition, pages
Springer, 2015. 429-448 p.
Lecture Notes in Computer Science, ISSN 0302-9743 ; 9207
Abstracting, Clocks, Computer aided analysis, Space research, Standards, Synchronization, Algorithmic approach, Clock Synchronization, Distributed systems, Modeling and verifications, Precision time protocols, State space exploration, Synchronous system, Time synchronization protocols, Model checking
IdentifiersURN: urn:nbn:se:kth:diva-181630DOI: 10.1007/978-3-319-21668-3_25ScopusID: 2-s2.0-84951146003ISBN: 9783319216676OAI: oai:DiVA.org:kth-181630DiVA: diva2:902447
18 July 2015 through 24 July 2015
QC 201602112016-02-112016-02-022016-06-13Bibliographically approved