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In this paper, the authors present vGreen, a multi-tiered software system for energy efficient computing in virtualized environments. It comprises of novel hierarchical metrics that capture power and performance characteristics of virtual and physical machines, and policies, which use it for energy efficient virtual machine scheduling across the whole deployment. They show through real life implementation on a state of the art testbed of server machines that vGreen can improve both performance and system level energy savings by 20% and 15% across benchmarks with varying characteristics.
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