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REALISM: Reliability-aware energy management in multi-level mixed-criticality systems with service level degradation
Journal of Systems Architecture ( IF 4.5 ) Pub Date : 2021-03-14 , DOI: 10.1016/j.sysarc.2021.102090
Hoora Sobhani , Sepideh Safari , Javad Saber-Latibari , Shaahin Hessabi

Mixed-criticality embedded systems, as the next-generation of safety-critical systems, are increasingly employed in the industry due to consolidating functionalities with varying criticality levels onto the same computing platform. Technology scaling, battery-supplied design, and heavy computation in mixed-criticality systems necessitate employing energy management techniques. Due to the degrading effects of these techniques on the system's reliability, minimizing energy consumption and meeting tasks’ timing constraints without sacrificing the reliability requirement is a vital challenge in designing mixed-criticality systems. In this paper, we propose REALISM; a novel Reliability- and Energy-Aware task mapping and scheduling approach in multi-core mixed-criticality systems with three levels of criticality. To guarantee the desired QoS of tasks from lower levels of criticality, our approach exploits the degraded WCET for these imprecise mixed-criticality tasks in critical modes. In design time, tasks are mapped to cores based on dynamic switching between different system utilizations in different modes. In each core, task instances are scheduled according to their virtual deadlines, which are calculated based on the system's overrun tolerance limit (TL) and the desired QoS, by time reservation. Then our heuristic DVFS techniques are applied in order to reduce system energy consumption. Our simulation results show that the REALISM provides on average ~41.5% (up to 52.7%) energy savings compared to the approach without energy management with 100% QoS degradation in lower levels of criticality. Also, with guaranteeing the system's desired QoS, REALISM provides on average ~38% (up to 46.2%) energy savings compared to the approach without energy management.



中文翻译:

REALISM:- [R eliability感知Ë NERGY米一个nagement在多伊维尔基尼中号固定的-临界小号系统总线接口s的服务水平降解

由于将具有不同关键级别的功能整合到同一计算平台上,混合关键嵌入式系统作为下一代安全关键系统在业界越来越多地被采用。在混合临界系统中,技术扩展,电池供电的设计以及繁重的计算需要采用能源管理技术。由于这些技术对系统可靠性的不利影响,在设计混合关键系统时,在不牺牲可靠性要求的情况下将能耗降至最低并满足任务的时序约束是一项至关重要的挑战。在本文中,我们提出了现实主义。具有三个关键性级别的多核混合关键性系统中的一种新颖的“可靠性和能源意识”任务映射和调度方法。为了从较低的关键级别保证所需的任务QoS,我们的方法在关键模式下针对这些不精确的混合关键任务使用降级的WCET。在设计时,基于不同模式下不同系统利用率之间的动态切换,将任务映射到内核。在每个核心中,任务实例是根据其虚拟截止时间进行调度的,虚拟截止时间是根据系统的超限容限(TL)和所需的QoS(通过时间保留)来计算的。然后应用我们的启发式DVFS技术以减少系统能耗。我们的仿真结果表明,与没有能源管理的方法相比,REALISM可以平均节省约41.5%(高达52.7%)的能源,并且在较低的关键级别上具有100%的QoS降低。另外,在保证系统所需的QoS的前提下,

更新日期:2021-04-12
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