Istituto di Scienza e Tecnologie dell'Informazione     
Xu J., Bondavalli A., Di Giandomenico F. Dynamic adjustment of dependability and efficiency in fault-tolerant software. In: Predictably Dependable Computing Systems / edited by B. Randell ... [et al.] (Basic Research series), pp. 155 - 137. Springer, 1995.
In this paper we discuss the problem of attaining adynamic compromise between using redundancy to improve software dependabilityand limiting the amount of redundancy so as to avoid unnecessary inefficencie A scheme. called self-configuring optimal programming (SCOP) is developed SCOP attempts to reduce the resource cost of faulttolerant software, both in space and time, by providing designers with a flexible redundancy architecture in which dependability and efficiency call be adjusted dynamically at run lime. A design methodology is proposed to introduce support techniques for such dynamic adjustment. Our scheme also suggests a general control framework into which design diversity, data diversity and multiple copies can be incorporated selectively. A detailed dependability and efficiency evaluation shows that SCOP can achieve the same dependability level as those of other existing schemes, while making more efficient use of available resources.
Subject Fault-tolerant software
C.4 Performance of systems. Fault tolerance

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