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Developing correct-by-construction distributed algorithms

Identifieur interne : 001C30 ( Hal/Curation ); précédent : 001C29; suivant : 001C31

Developing correct-by-construction distributed algorithms

Auteurs : Manamiary Bruno Andriamiarina [France]

Source :

RBID : Hal:tel-01258363

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Abstract

The subject of this thesis is the formal development and verification of distributed algorithms. We are interested in this topic, because proving that a distributed algorithm satisfies given specification and properties is a difficult task. We choose to use the Event B method (refinement, safety properties) and the temporal logic TLA (fairness, liveness properties) for modelling the distributed algorithms. There are several existing approaches for formalising distributed algorithms, and we choose to focus on the "correct-by-construction" paradigm, which is characterised by the use of model refinement, proof of properties (safety, liveness) and reuse of formal models/proofs/properties, developments (~ design patterns) for modelling distributed algorithms. Our works introduce a paradigm which allows us to describe an algorithm with a set of services/functionalities, which are then expressed using liveness properties. These properties guide us in developing the formal Event B models of the studied algorithms. Inference rules from TLA allow to decompose the liveness properties, therefore detailing the services and guiding the refinement process. This paradigm, called "service-as-event" is also characterized by (assertions) diagrams, which allow to graphically represent liveness properties (with respect to fairness hypotheses) and detail the mecanisms and functioning of the studied distributed algorithms. The "service-as-event" paradigm allowed us to develop and verify the following algorithms : routing algorithms, such as Anycast RP (Cisco Systems), XY for Networks-on-Chip (NoC), snapshot and self-* algorithms.

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Hal:tel-01258363

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<abstract xml:lang="fr">Nous présentons dans cette thèse intitulée "Développement d'algorithmes répartis corrects par construction" nos travaux sur le développement et la vérification formels d'algorithmes répartis. Nous nous intéressons à ces algorithmes, à cause de la difficulté de leur vérification et validation. Pour analyser ces algorithmes, nous avons choisi d'utiliser Event B pour le raffinement de modèles, la vérification de propriétés de sûreté, et TLA, pour la vérification des propriétés temporelles (vivacité et équité). Nous nous sommes focalisé sur le paradigme de correction-par-construction, basé sur la modélisation par raffinement, la preuve de propriétés, ainsi que la réutilisation de modèles/preuves/propriétés (~ patrons de conception) pour guider le développement formel des algorithmes étudiés. Nous avons mis en place un paradigme de développement lors duquel un algorithme réparti est dans un premier temps caractérisé par les services qu'il fournit, et qui sont ensuite exprimés par des propriétés de vivacité, guidant la construction des modèles Event B de cet algorithme. Les règles d'inférence de TLA nous permettent ensuite de détailler les propriétés de vivacité, et de guider le développement formel par raffinement de l'algorithme. Ce paradigme, appelé "service-as-event", est caractérisé par des diagrammes d'assertions permettant de représenter les propriétés de vivacité (en prenant en compte l'équité) des algorithmes répartis étudiés, de comprendre leurs mécanismes. Ce paradigme nous a permis d'analyser des algorithmes de routage (Anycast RP de Cisco Systems et XY pour les réseaux-sur-puce (NoC)), des algorithmes de snapshot et des algorithmes d'auto-stabilisation.</abstract>
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