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Optimal Multivariate Control for Differentiated Services on a Shared Hosting Platform

Authors (if Research)
Xue Liu, Xiaoyun Zhu, Padala Pradeep, Zhikui Wang, Sharad Singhal
Country
USA
Operating Regions
Operating Countries
Proceedings of the 46th IEEE Conference on Decision and Control (CDC'07), Dec 2007. Abstract: Today’s shared hosting platforms often employ virtualization to allow multiple enterprise applications with time-varying resource demands to share a common infrastructure in order to improve resource utilization. Meeting application-level quality of service (QoS) goals becomes a challenge in such an environment as enterprise applications often have a multi-tier architecture and complex interactions and dependencies among individual tiers. In addition, when the shared infrastructure becomes overloaded, appropriate resource control needs to be performed at these individual tiers in a coordinated fashion in order to provide differentiated services to co-hosted applications. In this paper, we present an adaptive multivariate controller that dynamically adjusts the resource shares to individual tiers of multiple applications in order to meet a specified level of service differentiation. The controller parameters are automatically tuned at runtime based on a quadratic cost function and a system model that is learned online using a recursive least-squares (RLS) method. To evaluate our controller design, we built a testbed hosting two instances of the RUBiS application, a multi-tier online auction web site, using Xen virtual machines. Our results indicate that our controller is able to meet given QoS differentiation targets between co-hosted applications while the total demand from these applications exceeds the capacities of the shared systems.
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