By Irene Eusgeld, Felix C. Freiling (auth.), Irene Eusgeld, Felix C. Freiling, Ralf Reussner (eds.)
With the starting to be ubiquity of computing structures, it really is crucial that we will be able to depend upon the companies they bring. Justifying reliance in desktops calls for medical concepts to derive facts from given structures or expect such proof. This instructional publication provides an outline of the present state-of-the-art in measuring the various elements of dependability of structures: reliability, defense and performance.
The major impulse for this dependability metrics undertaking resulted from a examine seminar, held at Schloss Dagstuhl, Germany, in October/November 2005. The 25 chapters, in response to the end result of the learn seminar, are prepared in 5 elements on foundations, reliability metrics, defense metrics, functionality metrics, and overlapping metrics. the ultimate half indicates that just a mixed attention of vital dependability attributes will result in the layout goal: the improvement of structures we will quite trust.
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Extra info for Dependability Metrics: Advanced Lectures
26 K. Chan and I. Poernomo According to traditional philosophy of science, we have a scientific theory that the speed of light is constant because we repeat the experiment many times and always get the same result. By induction, we infer that the speed of light is constant. Popper was not satisfied with this explanation of a scientific theory, as it admits theories he believed to be unscientific. For example, the theory of Marxism has thousands of empirical examples to show that capitalist societies inevitably lead to the rebellion of the working class.
In the testing phase, the action is clearer: some reengineering may be attempted. However, this is often not a possibility in post-deployment phases. An increasingly common solution is to employ some form of runtime software adaptation, in which a system is dynamically reconfigured in an attempt to conform to constraint requirements. There are many systems that permit dynamic adaptation of architectures based on real time QoS information. We have already mentioned that Wang’s group at Boeing integrates adaptation into its SLA management system .
The contracts are employed during testing to make sure the constructed system meets the QoS requirements With this method, every QoS parameter need to be formally specified using TLG. Post-deployment Validation Various metric values of deterministic software, in particular QoS metrics, are analyzable from a static point of view during a pre-deployment testing phase. However, there also exist systems which operate in highly variable environments and therefore have metric values that cannot be known a priori.