NeTS: Small:Performance-Engineered Overlay Networks for Real-time Distributed Applications

该项目正在探索如何设计和设计覆盖网络，以满足大规模虚拟世界和分布式网络物理系统等实时分布式应用的苛刻性能要求。这些应用程序的特点是具有大量分布式终端的会话，这些终端发布定期状态报告，这些报告必须传递给动态变化的一组收件人。它们需要不间断的数据传输，即使通信模式发生了变化。我们使用称为Comtree的新型通信原语来满足这一需求，该原语的功能类似于每个会话专用网络，该网络被配置为在存在快速变化的业务的情况下支持连续的数据传送。每个comtree都定义了自己的路由环境，从而实现了单播和组播数据包的简单且可扩展的路由。多播组可以是高度动态的，每个端点订阅数十或数百个多播组，并每秒多次更改其订阅。我们的配置方法确保每个Comtree有足够的容量来支持其流量，即使在存在快速变化的组播组的情况下也是如此。该项目中开发的方法将支持大规模、高度交互的虚拟世界，这些虚拟世界能够更好地支持商业和教育中的社交和群体协作应用程序。

This project is exploring how overlay networks can be designed and engineered to meet the demanding performance requirements of real-time distributed applications such as large-scale virtual worlds and distributed cyber-physical systems. These applications are characterized by sessions with large numbers of distributed endpoints that issue regular status reports that must be delivered to a dynamically changing set of recipients. They require non-stop data delivery, even as the communication pattern changes. We address this requirement using a novel communication primitive called a comtree that functions like a per-session private network that is provisioned to support continuous data delivery in the presence of rapidly changing traffic. Each comtree defines its own routing context, enabling simple and scalable routing for both unicast and multicast packets. Multicast groups can be highly dynamic with each endpoint subscribing to tens or hundreds of multicast groups and changing their subscriptions many times per second. Our provisioning methods ensure that each comtree has sufficient capacity to support its traffic, even in the presence of rapidly changing multicast groups. The methods developed in this project will enable large-scale, highly interactive virtual worlds that are better able to support social interaction and group collaboration applications in business and education.