ITR: Rate-based Scheduling Technology for Latency-Sensitive Graphics Applications

高度交互的图形应用程序具有严格的延迟要求，以确保引人注目的体验。这些要求通常通过过度配置硬件资源来满足，并通过ad-hoc测试进行验证。 实时调度技术的最新进展可以作为一种更具分析性的方法的基础。不幸的是，传统的实时调度规则是非常严格的，通常只在专用的实时操作系统中实现。在本计画中，我们将针对延迟敏感的绘图应用程序，开发一个即时排程与分析架构。 这个框架将扩展最近的工作基于速率的处理器调度。拟议的框架将允许将时间要求指定为平均速率，并将高度容忍任何偏离指定速率的情况。将通过涉及纳米机械手系统的研究对拟议的基于比率的框架进行评价（www.cs.unc.edu/Research/nano）。nanoManipulator将扫描隧道显微镜或原子力显微镜耦合到虚拟现实图形显示器和触觉接口，以提供远程呈现系统。 现有的nanoManipulator不是多线程的，因此系统很难修改和分析。 在这个项目中，一个完整的多线程版本的nanoManipulator将使用所提出的框架开发。

Highly interactive graphics applications have stringent latency requirements to ensure a compelling experience. These requirements are usually met by overprovisioning hardware resources and are validated through ad-hoc testing. Recent advances in real-time scheduling technology could serve as thebasis for a more analytical approach. Unfortunately, conventional real-time scheduling disciplines are quite rigid and are usually implemented only within special-purpose real-time operating systems. For these reasons, real-time scheduling techniques have been largely ignored within the graphics community.In this project, a real-time scheduling and analysis framework will be developed for latency-sensitive graphics applications. This framework will extend recent work on rate-based processor scheduling. The proposed framework will allow timing requirements to be specified as average rates and will be highly tolerant of any deviance from specified rates. The proposed rate-based framework will be evaluated through research involving the nanoManipulator system (www.cs.unc.edu/Research/nano). The nanoManipulator couples a scanning tunneling microscope or atomic force microscope to a virtual-reality graphics display and a haptic interface to provide a telepresence system. The existing nanoManipulator is not multi-threaded, and thus the system is difficult to modify and analyze. In this project, a fully multi-threaded version of the nanoManipulator will be developed using theproposed framework.