Rybu: Imperative-style Preprocessor for Verification of Distributed Systems in the Dedan Environment

Integrated Model of Distributed Systems (IMDS) is developed for specification and verification of distributed systems, and verification against deadlocks. On the basis of IMDS, Dedan verification environment was prepared. Universal deadlock detection formulas allow for automatic verification, without any knowledge of a temporal logic, which simplifies the verification process. However, the input language, following the rules of IMDS, seems to be exotic for many users. For this reason Rybu preprocessor was created. Its purpose is to build large models in imperative-style language, on much higher abstraction level.Comment: 16 pages, 1 figur

Threefold Analysis of Distributed Systems: IMDS, Petri Net and Distributed Automata DA3

Integrated Model of Distributed Systems is used for specification and verification of distributed systems. In the formalism, a system is modeled as a set of servers' states and agents' messages. The operation of a system is modeled as actions converting global system configuration (a set of states and messages) to a new configuration. The formalism is used in Dedan verification environment, in which specification and verification of distributed systems is performed. Equivalent Petri nets are used for structural analysis. For the graphical specification and simulation of distributed systems, Distributed Autonomous and Asynchronous Automata (DA3) are invented. Such simulation does not require calculation of global configuration space of a system. Two forms of DA3 are shown: Server-DA3 (SDA3) for the server view and Agent-DA3 (ADA3) for the agent view.Comment: 10 pages, 5 figures, 1 tabl