Understanding Peer Exchange in BitTorrent Systems
Understanding Peer Exchange in BitTorrent Systems
复制标题
了解 BitTorrent 系统中的对等交换
DOI：
10.1109/p2p.2010.5569967
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
K. Ross
中科院分区：
文献类型：
--
作者：
Di Wu;Prithula Dhungel;Xiaojun Hei;Chao Zhang;K. Ross
Peer Exchange(PEX)是指对等点之间直接交换Torrent中的活动对等点列表，已经在现代BitTorrent客户端中广泛实现，用于分散的对等点发现。然而，对PEX在操作系统中的行为知之甚少。在本文中，我们进行了被动测量和PlanetLab实验，以研究BitTorrent PEX的影响和性能。我们首先研究了PEX对BitTorrent下载效率的影响。我们观察到PEX可以显著减少某些Torrent的下载时间。然后分析了PEX消息的新鲜度、冗余度和传播速度。最后，我们还进行了大规模的PlanetLab实验，以了解PEX对BitTorrent覆盖特性的影响。
Peer Exchange (PEX), in which peers directly exchange with each other lists of active peers in the torrent, has been widely implemented in modern BitTorrent clients for decentralized peer discovery. However, there is little knowledge about the behavior of PEX in operational systems. In this paper, we perform both passive measurements and Planetlab experiments to study the impact and properties of BitTorrent PEX. We first study the impact of PEX on the download efficiency of BitTorrent. We observe that PEX can significantly reduce the download time for some torrents. We then analyze the freshness, redundancy and spread speed of PEX messages. Finally, we also conduct large- scale Planetlab experiments to understand the impact of PEX on the overlay properties of BitTorrent.