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A Control-Theoretic Approach to Power Management in Embedded Processors

Summary: 1
A Control-Theoretic Approach to Power
Management in Embedded Processors
Nagarajan Kandasamy and Sherif Abdelwahed
Contact author: Nagarajan Kandasamy
Phone: +1 615 322 6973
FAX: +1 615 343 7440
Suggested Topics: Power management, Low-power embedded systems
Embedded processors must be operated in power-efficient fashion while satisfying application-specific
quality-of-service (QoS) requirements. This paper addresses the power management of embedded
processors via a control-theoretic method. A model-predictive controller is proposed where the
corresponding control signals managing power consumption are generated via a mathematical processor
model by minimizing a specified cost function. Using a past history of time-varying data arrival and
processing rates, the controller predicts future processor behavior over a finite look-ahead interval. Based
on this prediction, it then derives the lowest possible operating frequency necessary to process data arrivals
by optimizing (multiple) QoS criteria. We describe the processor model, formulate the power management
problem, and derive the necessary controller. The performance of the proposed controller is also evaluated
via detailed experiments using synthetic workloads.


Source: Abdelwahed, Sherif - Department of Electrical Engineering and Computer Science, Vanderbilt University


Collections: Engineering