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Consolidation of applications in cloud computing environments presents a significant opportunity for energy optimization. As a first step toward enabling energy efficient consolidation, the paper studies the inter-relationships between energy consumption, resource utilization, and performance of consolidated workloads. The study reveals the energy performance trade-offs for consolidation and shows that optimal operating points exist. The paper models the consolidation problem as a modified bin packing problem and illustrates it with an example. Finally, the paper outlines the challenges in finding effective solutions to the consolidation problem.
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