Reliability Models for Hard Real-Time Systems

Colin Perkins and Andy Tyrrell

Proceedings of the 2nd IMA Conference on the Mathematics of Dependable Systems, York, UK, September 1995.

We present a new reliability model for hard real-time systems. This is an extended Markov model, derived from an analysis of the generic properties of hard real-time systems subject to a simple random-fault model. Our model permits analysis of the run-time behaviour of a system, in order to derive the probability profiles of the system's completion/failure times. The model is applied to the analysis of a simple sequential recovery block system, and illustrative examples based on this system are provided. The paper concludes with a discussion of the application of such accurate completion profile information to the design of embedded software systems.

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