CIF: Small: Fundamental Issues in Peer-to-Peer Communication

本项目探讨非结构化点对点（P2P）通信的基本性能和设计问题。它侧重于公共互联网上的通信，这是广泛分布的资源的共享，这些资源通常由不同的实体拥有，并且通常涉及终端用户的计算机作为客户端和服务器。但分析也超出了互联网的范围，涉及到连接到互联网的人和设备的生态。该项目有助于我们测量、设计、控制和理解已经在进行中的P2P通信的爆炸式增长。更多交互式用户生成内容、交互式游戏、在线交互式教学和应用程序即将出现，这是令人兴奋的可能性。点对点通信可能会显著改变互联网的结构。P2P系统的开放、不受控制的光环与可靠性和安全性之间存在紧张关系。通过更好地理解P2P机制的功能，本研究提高了未来互联网的价值。研究人员在各种情况下研究P2P系统的基本方面。这些方面包括：对等选择和片段选择的策略，推与拉，主动与被动，异构链路和主机速度的影响，激励机制的影响，网络拓扑的影响-特别是集群和减少isp之间的流量，延迟和编码。上下文包括文件传输、实时流视频、视频点播和容忍延迟的交互系统。方法是设计和分析捕获上述方面和上下文的各种组合的模型。研究人员量化基本性能限制，并开发易于处理的性能分析和设计方法。

This project explores fundamental performance and design issues for unstructured peer-to-peer (P2P) communication. It focuses on communication over the public Internet, which is the sharing of widely distributed resources, which are typically owned by different entities, and which typically involve end users' computers acting as both clients and servers. But the analysis also ranges beyond the scope of the Internet, to the ecology of people and devices connected to the Internet. The project contributes to our ability to measure, design, control, and understand the explosion in P2P communication that is already underway. There are exciting possibilities on the horizon for more interactive user generated content, interactive gaming, online interactive instruction, and applications to come. Peer-to-peer communication is likely to significantly alter the structure of the Internet. There is a tension between the open, uncontrolled aura of P2P systems, and reliability and security concerns. By providing a better understanding of the capabilities of P2P mechanisms, this research enhances the value of the future Internet.The investigators study basic aspects of P2P systems in a variety of contexts. These aspects include: strategies of peer selection and piece selection, push vs. pull, proactive vs. reactive, effects of heterogeneous link and host speeds, the impact of incentive mechanisms, effects of network topology--in particular clustering and reduction of inter-ISP traffic, delay, and coding. The contexts include file transfer, live streaming video, video on demand, and delay tolerant interactive systems. The approach is to devise and analyze models capturing various combinations of the above aspects and contexts. The investigators quantify fundamental performance limits, and develop tractable performance analysis and design methods.