The emerging interests within the IT industry on utility computing and virtualization technologies have created a need for more effective workload management tools, one that dynamically controls resource allocation to a hosted application to achieve Quality of Service (QoS) goals. These goals can in turn be driven by the utility of the service provided, typically based on the application's Service Level Agreement (SLA) as well as the cost of resources allocated to the application. This paper builds on the earlier work on dynamic CPU allocation to applications on shared servers, and presents a feedback control system consisting of two nested integral control loops for managing the QoS metric of the application along with the utilization of the allocated CPU resource.
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