A Measurement Study of Peer-to-Peer File Sharing Systems[转载]

A Measurement Study of Peer-to-Peer File Sharing Systems


点对点文件分享系统的衡量方法的研究

Stefan Saroiu	P. Krishna Gummadi	Steven D. Gribble
Department of Computer Science & Engineering University of Washington Seattle, WA 98195-2350, USA {tzoompy, gummadi, gribble}@cs.washington.edu

原文链接

The popularity of peer-to-peer multimedia file sharing applications such as Gnutella and Napster has created a flurry of recent research activity into peer-to-peer architectures. We believe that the proper evaluation of a peer-to-peer system must take into account the characteristics of the peers that choose to participate. Surprisingly, however, few of the peer-to-peer architectures currently being developed are evaluated with respect to such considerations. We believe that this is, in part, due to a lack of information about the characteristics of hosts that choose to participate in the currently popular peer-to-peer systems. In this paper, we remedy this situation by performing a detailed measurement study of the two most popular peer-to-peer file sharing systems, namely Napster and Gnutella. In particular, our measurement study seeks to precisely characterize the population of end-user hosts that participate in these two systems. This characterization includes the bottleneck bandwidths between these hosts and the Internet at large, IP-level latencies to send packets to these hosts, how often hosts connect and disconnect from the system, how many files hosts share and download, the degree of cooperation between the hosts, and several correlations between these characteristics. Our measurements show that there is significant heterogeneity and lack of cooperation across peers participating in these systems.

本文讲对两个非常流行的点对点系统，Napster和Gnutella，进行详细研究；该研究将更准确的反映两个系统最终用户的体验；包括这些用户的带宽瓶颈，包延迟，用户接入和退出系统的生命周期，用户共享和下载的数据量，用户间互相协作的水平，以及这些性能特征的关系。