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Scheduling Soft Aperiodic Tasks in Adaptable Fixed-Priority Systems

机译：在自适应固定优先级系统中调度软性非周期性任务

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摘要

This paper presents a new type of scheduling algorithm for servicing soft deadline aperiodic tasks in adaptable fixed-priority real-time systems. The major goals of our proposed task scheduling are not only to guarantee all the deadlines of periodic tasks and to obtain fast response time for aperiodic tasks, but also to retain considerable scheduling predictability. To achieve these goals, we have adopted a new aperiodic task scheduling principle in which a normal fixed-priority assignment strategy and the information on a preassignment table built off-line are properly mingled somewhat dynamically according to the aperiodic tasks' arrivals at runtime. The paper also shows some simulation results in terms of the average aperiodic response time, verifying that the new algorithm offers significant performance improvements over other conventional joint scheduling algorithms, especially under a heavy transient overload.
机译：本文提出了一种新型的调度算法，用于服务于自适应固定优先级实时系统中的软期限非周期任务。我们提出的任务调度的主要目标不仅是要保证定期任务的所有最后期限，并为非周期性任务获得快速响应时间，而且还要保留可观的调度可预测性。为了实现这些目标，我们采用了新的非周期性任务调度原则，其中，根据非周期性任务在运行时的到达情况，适当地动态混合了正常的固定优先级分配策略和离线构建的预分配表上的信息。本文还根据平均非周期性响应时间显示了一些仿真结果，证明了该新算法与其他常规联合调度算法相比，尤其在严重的瞬态过载下，提供了显着的性能改进。

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