通过减少最坏情况下线程间缓存干扰,改进多核处理器上的静态实时调度

ACM SE '10 Pub Date : 2010-04-15 DOI:10.1145/1900008.1900148
Yiqiang Ding, Wei Zhang
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引用次数: 2

摘要

众所周知,了解实时任务的最坏情况执行时间(WCET)对于实时系统中的可调度性分析至关重要。然而,在多核计算环境中,共享资源(如共享缓存)中的线程间干扰会显著影响每个实时任务的WCET,使得实际(即运行时)的WCET与调度前静态估计的WCET相差很大。在本文中,我们提出了一种基于目标实时任务的WCET的多核平台静态实时调度方法,该方法考虑了共享L2缓存中线程间干扰的最坏情况。此外,在静态调度方法中引入贪婪算法,在最小化最坏情况下线程间缓存干扰和WCET的同时生成安全调度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Improving the static real-time scheduling on multicore processors by reducing worst-case inter-thread cache interferences
As well known, knowing the worst-case execution time (WCET) of real-time tasks is crucial for schedulability analysis in a real-time system. In a multicore computing environment, however, the inter-thread interferences in the shared resources such as the shared cache can significantly affect the WCET of each real-time task, making the actual (i.e runtime) WCET quite different from the statically estimated WCET obtained before scheduling. In this paper, we present a novel static real-time scheduling approach on multicore platforms based on the WCET of target real-time tasks provided by considering the worst case inter-thread interferences in the shared L2 cache. Furthermore a greedy algorithm is integrated into the static scheduling approaches to generate safe schedules while minimizing the worst-case inter-thread cache interferences and WCET.
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