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A new technique for performance regulation in event-driven systems, recentlyproposed by the authors, consists of an adaptive-gain integral control. Thegain is adjusted in the control loop by a real-time estimation of thederivative of the plant-function with respect to the control input. Thisestimation is carried out by Infinitesimal Perturbation Analysis (IPA). Themain motivation comes from applications to throughput regulation in computerprocessors, where to-date, testing and assessment of the proposed controltechnique has been assessed by simulation. The purpose of this paper is toreport on its implementation on a machine, namely an Intel Haswellmicroprocessor, and compare its performance to that obtained from cycle-level,full system simulation environment. The intrinsic contribution of the paper tothe Workshop on Discrete Event System is in describing the process of taking anIPA-based design and simulation to a concrete implementation, thereby providinga bridge between theory and applications.

IPA in the Loop: Control Design for Throughput Regulation in Computer Processors