Multi-core Interference-Sensitive WCET Analysis Leveraging Runtime Resource Capacity Enforcement
Multi-core Interference-Sensitive WCET Analysis Leveraging Runtime Resource Capacity Enforcement
复制标题
利用运行时资源容量实施的多核干扰敏感 WCET 分析
DOI：
10.1109/ecrts.2014.20
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Michael Schmidt
中科院分区：
文献类型：
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作者：
Jan Nowotsch;M. Paulitsch;Daniel Buhler;Henrik Theiling;Simon Wegener;Michael Schmidt
多核处理器的性能和功率效率对于安全关键型应用（如航空电子设备）来说具有吸引力。但是，在为这些领域部署它们时，增加的集成和平均情况下的性能优化带来了挑战。在本文中，我们提出了一种新的方法来计算是WCET考虑可变的访问延迟，由于在多核处理器中的共享资源的并发使用，特别是集中在共享互连和主存储器。因此，我们解决了安全关键应用程序所需的时间分割的问题。特别是，我们引入额外的阶段，以国家的最先进的时序分析技术，分析应用程序的资源使用情况，并计算干扰延迟。我们进一步补充了离线分析与运行时监控的概念，以执行资源使用的保证。这些概念在Free scale的P4080多核处理器上结合SYSGO的商业实时操作系统Pike OS和Abs Int的时序分析框架aiT进行了评估。我们抽象的真实的应用程序的行为使用的EEMBC自动基准测试套件的代表性任务集。我们的研究结果显示，多核WCET减少了53%，同时对应用程序的时间和功能行为实现了完全透明，从而实现了遗留应用程序的无缝集成。
The performance and power efficiency of multi-core processors are attractive features for safety-critical applications, as in avionics. But increased integration and average-case performance optimisations pose challenges when deploying them for such domains. In this paper we propose a novel approach to compute an is WCET considering variable access delays due to the concurrent use of shared resources in multi-core processors, particularly focusing on shared interconnects and main memory. Thereby we tackle the problem of temporal partitioning as required by safety-critical applications. In particular, we introduce additional phases to state-of-the-art timing analysis techniques to analyse an application's resource usage and compute an interference delay. We further complement the offline analysis with a runtime monitoring concept to enforce resource usage guarantees. The concepts are evaluated on Free scale's P4080 multi-core processor in combination with SYSGO's commercial real-time operating system Pike OS and Abs Int's timing analysis framework aiT. We abstract real applications' behaviour using a representative task set of the EEMBC Auto bench benchmark suite. Our results show a reduction of up to 53% of the multi-core WCET, while implementing full transparency to the temporal and functional behaviour of applications, enabling the seamless integration of legacy applications.