Timeout Order Abstraction for Time-Parametric Verification of Loosely Synchronized Real-Time Distributed Systems
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Lynch_Timeout order.pdf
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Author(s)
Umeno, Shinya
Lynch, Nancy A.
Date Issued
December 2009
Journal
Proceedings of the 2nd Workshop on Compositional Theory and Technology for Real-Time Embedded Systems
Publisher
Artist Consortium
Citation
Umeno, Shinya and Nancy Lynch. "Timeout Order Abstraction for Time-Parametric Verification of Loosely Synchronized Real-Time Distributed Systems." Proceedings of the 2nd Workshop on Compositional Theory and Technology for Real-Time Embedded Systems, CRTS 2009, December 1, 2009, Washington, D.C., USA.
Version
Author's final manuscript
Abstract
We present timeout order abstraction (TO-abstraction), a
technique to systematically abstract a given loosely synchronized
real-time distributed system (LSRTDS) into an untimed model. We
define the subclass of LSRTDS’s that we can apply TO-abstraction
using a syntax template that represents a restriction to Tempo,
the primary modeling language of TIOA [7]. The untimed model
obtained from the abstraction is a classical finite state machine, and
thus one can automatically verify temporal properties of the model
using a conventional model-checker. We prove the soundness of the
abstraction using simulation relation. From this result, we guarantee
that any untimed safety property of the untimed model also holds for
the original TIOA model.
We have applied TO-abstraction to a resource-sharing protocol
and the DHCP Failover protocol. We verified untimed abstractions
of them by bounded model-checking up to depth 20. We have also
experimented with effectiveness of bug-finding using our technique by
mutating particular parts of the original code. From this experiment,
we found a complex bad execution that would have been very difficult
to find by human or simulations.
Description
URL to paper listed on conference site.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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