In recent years power consumption of high performance computing (HPC) clusters has become a growing problem due, e.g., to the economic cost of electricity, the emission of carbon dioxide (with negative impact on the environment), and the generation of heat (which reduces hardware reliability). In past work, we developed EnergySaving cluster, a software package that regulates the number of active nodes in an HPC facility to match the users' demands. In this paper, we extend this work by

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... g a simulator for this tool that allows the evaluation and analysis of the benefits of applying different energy-saving strategies and policies, under realistic workloads, to different cluster configurations. Copyright is held by the author(s) This work is based on an earlier work: A flexible simulator to evaluate a power saving system for HPC clusters, in Proceedings of the 2 nd International Workshop on Green Computing Middleware, c ACM, 2011.