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Ideas coming from volunteer computing can be borrowed and incorporated into the Cloud computing model. The result is a volunteer Cloud where the infrastructure is obtained by merging heterogeneous resources offered by different domains and/or providers such as other Clouds, Grid farms, clusters, and datacenters, till single desktops. This new paradigm(More)
This paper presents an approach to the performance analysis of distributed software systems that relies on the use of the MetaPL notation system. MetaPL is an XML-based language that can describe programs written in different distributed programming languages and environments. The possibility to include timing information in the program description promotes(More)
In a world made of interconnected systems which manage huge amounts of confidential and shared data, security plays a significant role. Policies are the means by which security rules are defined and enforced. The ability to evaluate policies is becoming more and more relevant, especially when referred to the cooperation of services belonging to un-trusted(More)
In Web Services designs classical optimization techniques are not applicable. A possible solution to guarantee critical requirements is the use of an autonomic architecture, able to auto-configure and to auto-tune. This study presents MAWeS (MetaPL/HeSSE Autonomic Web Services), a framework whose aim is to support the development of self-optimizing(More)
Cross platform APIs for cloud computing are emerging due to the need of the application developer to combine the features exposed by different cloud providers and to port the codes from one provider environment to another. Such APIs are allowing nowadays the federation of clouds to an infrastructure level, requiring a certain knowledge of programming the(More)