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