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Utility-Aware Scheduling of Stochastic Real-Time Systems (2011)
BibTeX
@MISC{Tidwell11utility-awarescheduling,
author = {Terry Tidwell and Hiro Mukai and Arye Nehorai and William Smart and Terry Tidwell},
title = {Utility-Aware Scheduling of Stochastic Real-Time Systems},
year = {2011}
}
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Abstract
Abstract: Time utility functions offer a reasonably general way to describe the complex timing constraints of real-time and cyber-physical systems. However, utility-aware scheduling policy design is an open research problem. In particular, scheduling policies that optimize expected utility accrual are needed for real-time and cyber-physical domains. This dissertation addresses the problem of utility-aware scheduling for systems with periodic real-time task sets and stochastic non-preemptive execution intervals. We model these systems asMarkov Decision Processes. This model provides an evaluation framework by which different scheduling policies can be compared. By solving the Markov Decision Process we can derive value-optimal scheduling policies for moderate sized problems. However, the time and memory complexity of computing and storing value-optimal scheduling policies also necessitates the exploration of other more scalable solutions. We consider heuristic schedulers, including a generalization we have developed for the existing Utility Accrual Packet Scheduling Algorithm. We compare several heuristics under soft and hard real-time conditions, different load conditions, and different classes of time utility functions. Based on these evaluations we present guidelines for which heuristics are best suited to
Keyphrases
utility-aware scheduling stochastic real-time system time utility function value-optimal scheduling policy utility-aware scheduling policy design stochastic non-preemptive execution interval heuristic scheduler markov decision process evaluation framework different class cyber-physical system cyber-physical domain different load condition complex timing constraint several heuristic open research problem scalable solution memory complexity decision process utility accrual utility accrual packet scheduling algorithm hard real-time condition general way periodic real-time task set
