Sensitivity Analysis of the Minimum Task Period for Arbitrary Deadline Real-Time Systems

Fengxiang Zhang, A. Burns, Sanjoy Baruah
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引用次数: 2

Abstract

The most important character of real-time systems is that they have stringent timing deadlines that must be guaranteed. A hard real-time system is required to complete its operations before all its timing deadlines. For a given task set, it is useful in an engineering context to know what changes to period can be made to a task that will deliver a schedulable system. In this paper, we develop the sensitivity analysis of task period for EDF scheduled systems on a uniprocessor. We prove that a minimum task period can be determined by a single pass of the QPA algorithm, an improved scheme is presented by using different initial values of the period. The approaches developed for sensitivity analysis of task period are therefore as efficient as QPA, and are easily incorporated into a system design support tool.
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任意截止时间实时系统最小任务周期的敏感性分析
实时系统最重要的特点是它们具有必须保证的严格的时间截止日期。硬实时系统需要在所有时间期限之前完成其操作。对于给定的任务集,在工程上下文中了解可以对任务进行哪些周期更改以交付可调度系统是很有用的。本文研究了单处理机上EDF调度系统任务周期的敏感性分析。我们证明了QPA算法可以通过一次遍历来确定最小任务周期,并提出了使用不同周期初始值的改进方案。因此,为任务期敏感性分析而开发的方法与QPA一样有效,并且很容易合并到系统设计支持工具中。
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