Paper Details

Repeatable execution of occam programs

Authors: Villano, Umberto

Abstract:

Parallel programs are intrinsically non-deterministic, and therefore the techniques of cyclical debugging that are commonly used for sequential programs are not suitable for parallel ones. This paper proposes a method for guaranteeing the repeatability of occam program behaviour. Saving information on the ALT guards selected at run-time allows program replay. i.e. makes it possible to re-execute the program following the same instruction path whatever the speed at which each component process is executed. This enables the software developer to use tools such as debuggers and intrusive monitors to help identify program errors. After a discussion on the possible implementations of the proposed technique, a prototype tools that allows the replat of occam programs within TDS is briefly described.

Proceedings:

Proceedings of WoTUG-14: Occam and the Transputer-Current Developments, Janet Edwards, 1991, pp 133 - 142 published by IOS Press, Amsterdam

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