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In this paper we survey state-of-the-art of integration and application of Cloud Computing (CC) to High Performance Computing (HPC). Motivation and general application areas are presented demonstrating particular focus on commoditization of HPC resources. Current experiments usually show significant performance differences between CC and HPC infrastructures and also programming models. However, recent research efforts aim at finding a common ground between those approaches. A conclusion emerges that some level of synthesis of CC and HPC is inevitable and probably beneficial for both, however, it requires further significant research efforts.