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

高度交互的图形应用程序有严格的延迟要求，以确保引人注目的体验。这些需求通常通过过度配置硬件资源来满足，并通过特别测试进行验证。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，传统的实时调度规程非常严格，通常只在专用的实时操作系统中实现。由于这些原因，实时调度技术在很大程度上被图形界所忽视。在这个项目中，将为延迟敏感的图形应用程序开发一个实时调度和分析框架。这个框架将扩展最近基于速率的处理器调度工作。拟议的框架将允许将时间要求指定为平均费率，并将高度容忍与指定费率的任何偏差。提议的基于速率的框架将通过涉及nanoManipulator系统（www.cs.unc.edu/Research/nano）的研究进行评估。该纳米机械臂将扫描隧道显微镜或原子力显微镜与虚拟现实图形显示器和触觉界面相结合，以提供远程呈现系统。现有的纳米机械臂不是多线程的，因此系统难以修改和分析。在这个项目中，将使用提议的框架开发一个完全多线程版本的nanomaniplator。

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.