A Synthetic Utilization Bound for Aperiodic Tasks with Resource Tequirements

Utilization bounds for schedulability of aperiodic tasks are new in real-time scheduling literature. All aperiodic bounds known to date apply only to independent tasks. They either assume a liquid task model (one with infinitely many infinitesimal tasks) or are limited to deadline-monotonic and earliest-deadline first scheduling. In this paper, the authors make two important contributions. First, they derive the first aperiodic utilization bound that considers a task model with resource requirements. Second, the new bound is a function of a parameter called preemptable deadline ratio that depends on the scheduling policy. We show that many scheduling policies can be classified by this parameter allowing per-policy bounds to be derived. Simulation results demonstrating the applicability of aperiodic utilization bounds are presented.
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Abdelzaher, Tarek, and Vivek Sharma. "A Synthetic Utilization Bound for Aperiodic Tasks with Resource Tequirements." University of Virginia Dept. of Computer Science Tech Report (2002).