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The performance of Cloud systems is a key concern, but has typically been assessed by the comparison of relatively few Cloud systems, and often on the basis of just one or two features of performance. In this paper, the authors discuss the evaluation of four different Infrastructure as a Service (IaaS) Cloud systems - from Amazon, Rackspace, and IBM - alongside a private Cloud installation of OpenStack, using a set of five so-called micro-benchmarks to address key aspects of such systems. The results from their evaluation are offered on a web portal with dynamic data visualization.
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