CSR---EHS: PITAS: Probabilistic Implementation and Temperature Aware Scheduling of Embedded Software for Energy Efficiency

软实时嵌入式系统，如PDA，便携式多媒体设备，传感器和一些控制系统，需要以及时的方式处理数据流，这取决于无法检测偶尔执行失败或最后期限错过的最终用户的满意度。额外的系统资源将提供更好的性能，但最终用户可能不会注意到，也不会奖励这样的努力。这一独特功能有助于软实时系统的高效设计和实现。这个项目正在开发一个新的设计框架，系统地转移到更好的资源管理，如减少能源消耗，这种软的最后期限，在这项研究中所追求的策略是分配（离线）最小的系统资源，以满足给定的软实时性能要求统计。也就是说，系统不保证每次执行的完成，但它将在大量重复中产生足够多的完成，以满足用户特定的完成率。 在真实的执行过程中，片上温度对系统速度和功耗的影响引导频率和电压的动态缩放，以利用多处理器系统上未使用的容量来提高能量效率。（3）进行面向消费者的数字信号处理软件的概念验证原型设计。这项研究使一个重要的软实时嵌入式系统家族的资源有效设计和实现成为可能，预计将对嵌入式系统产业、未来监控系统和人们的日常生活产生直接影响。参与该项目的本科生和研究生都可以学习嵌入式系统设计技能并获得研究经验。

Soft real-time embedded systems, such as PDAs, portable multimedia devices, sensors, and some control systems, require the processing of data streams in a timely fashion, as determined by the satisfaction of end users who cannot detect occasional execution failures or deadline misses. Additional system resources would provide better performance, but the end users may not notice and will not reward such efforts. This unique feature sheds light on the efficient design and implementation of soft real-time systems. This project is developing a new design framework to systematically transfer such softness of the deadlines into better resource management, such as reduction of energy consumption.The strategy pursued in this research is to allocate (off-line) the minimal system resources necessary to meet the given soft real-time performance requirements statistically. That is, the system does not guarantee the completion of each execution, but it will produce sufficiently many completions over a large number of repetitions to meet the user-specific completion ratio. Then during real time execution, on-chip temperature on system speed and power dissipation guide dynamic scaling of frequency and voltage to exploit unused capacity for energy efficiency on the multi-processor system.This work focuses on (1) building and validating a theoretical foundation for the proposed probabilistic design framework; (2) developing a set of probabilistic multimedia application benchmarks and prototype synthesis tool software; and (3) conducting proof-of-concept prototyping of consumer-oriented digital signal processing software.This research enables the resource-efficient design and implementation of an important family of soft real-time embedded systems and is expected to have direct impact on the embedded systems industry, future surveillance systems, and people's daily life. Both undergraduate and graduate students involved in the project learn embedded system design skills and gain research experience.