Write a Blog >>
VMCAI 2017
Sun 15 - Tue 17 January 2017
co-located with POPL 2017
Sun 15 Jan 2017 14:00 - 14:30 at Amphitheater 44 - Concurrency 1 Chair(s): Camille Coti

Fault-tolerant distributed algorithms are a vital part of mission-critical distributed systems. In principle, automatic verification can be used to ensure the absence of bugs in such algorithms. In practice however, model checking tools will only establish the correctness of fault-tolerant distributed algorithms if message passing is encoded efficiently. In this paper, we consider abstractions suitable for many fault-tolerant distributed algorithms that count messages for comparison against thresholds, e.g., the size of a majority of processes. Our experience shows that storing only the numbers of sent and received messages in the global state is more efficient that explicitly modeling message buffers or sets of messages. Storing only the numbers is called message-counting abstraction. Intuitively, this abstraction should maintain all necessary information. In this paper, we confirm this intuition for asynchronous systems by showing that the abstract system is bisimilar to the concrete system. Surprisingly, if there are real-time constraints on message delivery (as assumed in fault-tolerant clock synchronization algorithms), then there exist neither timed bisimulation, nor time-abstracting bisimulation. Still, we prove this abstraction useful for model checking: it preserves ATCTL properties, as the abstract and the concrete models simulate each other.

Sun 15 Jan
Times are displayed in time zone: Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna change

14:00 - 15:30: Concurrency 1VMCAI at Amphitheater 44
Chair(s): Camille CotiLIPN, Université Paris 13
14:00 - 14:30
Accuracy of Message Counting Abstraction in Fault-Tolerant Distributed Algorithms
14:30 - 15:00
Independence Abstractions and Models of Concurrency
Vijay D'SilvaGoogle Inc., Daniel KroeningUniversity of Oxford, Marcelo SousaUniversity of Oxford
15:00 - 15:30
Static Analysis of Communicating Process using Symbolic Transducers
Vincent BotbolCEA LIST + LIP6 Université Pierre & Marie Curie, Tristan Le GallCEA LIST, Emmanuel ChaillouxLIP6 - UPMC
Media Attached File Attached