Istituto di Scienza e Tecnologie dell'Informazione     
Chiaradonna S., Bondavalli A., Strigini L. Comparative performability evaluation of RB, NVP and SCOP. Internal note CNUCE-B4-94-002, 1994.
An adaptive scheme for software fault-tolerance is evaluated from the point of view of performability, comparing it with previously published analyses of the more popular schemes, recovery blocks and multiple version programming. In the case considered, this adaptive scheme, "Self-Configuring Optimistic Prograrnrning" (SCOP), is equivalent to N-version programming in terms of the probability of delivering correct results, but achieves better performance by delaying the execution of some of the variants until it is made necessary by an error. We discuss, by mean of an example, the application of modelling to realistic problems in fault-tolerant design.
Subject Performability evaluation

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