CPS: Synergy: Collaborative Research: Thermal-Aware Management of Cyber-Physical Systems

网络物理系统中的处理器越来越多地被用于必须在恶劣的环境条件和可能导致芯片温度高的计算工作负荷下运行的应用。例子包括汽车、机器人、飞机和宇宙飞船。较高的工作温度加速了芯片的老化，从而增加了瞬时和永久性故障率。目前处理这一问题的方法大多是在处理器内核的某一部分超过给定的温度阈值时关闭处理器内核或大幅减慢它的速度。然而，这种通过/失败方法忽略了以下事实：(A)处理器由于高温而加速老化，即使这些温度低于阈值，以及(B)尽管截止日期是实时任务将受控对象保持在允许的状态空间的约束，但如果降低电压或频率(以冷却芯片)，将增加的实际控制器响应时间是决定受控对象性能的因素。现有的方法也不能利用控制器可靠性(受其温度历史影响)和工厂性能之间的权衡。这个项目解决了这些问题。正在设计负载整形算法来管理热应力，同时确保适当水平的控制质量。这些动作包括任务迁移、改变执行速度、选择控制功能的替代算法或软件实现、以及过早地终止迭代任务的可选部分。该项目的验证平台包括汽车和无人机。选择这些平台是基于它们对社会的重要性和它们带来的重大技术挑战。随着CPS在我们的生活和商业中变得越来越重要，这个将使CPS控制器更可靠和/或更经济的项目具有广泛的潜在社会和经济影响。与通用汽车的合作促进了新技术向产业的过渡。该项目包括在高中、本科和研究生课程中向学生介绍计算机中的热控制的活动。

Processors in cyber-physical systems are increasingly being used in applications where they must operate in harsh ambient conditions and a computational workload which can lead to high chip temperatures. Examples include cars, robots, aircraft and spacecraft. High operating temperatures accelerate the aging of the chips, thus increasing transient and permanent failure rates. Current ways to deal with this mostly turn off the processor core or drastically slow it down when some part of it is seen to exceed a given temperature threshold. However, this pass/fail approach ignores the fact that (a) processors experience accelerated aging due to high temperatures, even if these are below the threshold, and (b) while deadlines are a constraint for real-time tasks to keep the controlled plant in the allowed state space, the actual controller response times that will increase if the voltage or frequency is lowered (to cool down the chip) are what determine the controlled plant performance. Existing approaches also fail to exploit the tradeoff between controller reliability (affected by its temperature history) and the performance of the plant. This project addresses these issues. Load-shaping algorithms are being devised to manage thermal stresses while ensuring appropriate levels of control quality. Such actions include task migration, changing execution speed, selecting an alternative algorithm or software implementation of control functions, and terminating prematurely optional portions of iterative tasks. Validation platforms for this project include automobiles and unmanned aerial vehicles. These platforms have been chosen based on both their importance to society and the significant technical challenges they pose.With CPS becoming ever more important in our lives and businesses, this project which will make CPS controllers more reliable and/or economical has broad potential social and economic impacts. Collaboration with General Motors promotes transition of the new technology to industry. The project includes activities to introduce students to thermal control in computing, in courses spanning high-school, undergraduate and graduate curricula.