Bit Torrent协议是一种基于P2P(Peer to Peer)的文件共享协议,具有"用户越多,下载速度越快"的特点,尤其是针对大文件的下载,更能体现出系统的优越性。视频媒体流是近年来网络用户占有量最多的一类文件,随着消费者带宽的进一...Bit Torrent协议是一种基于P2P(Peer to Peer)的文件共享协议,具有"用户越多,下载速度越快"的特点,尤其是针对大文件的下载,更能体现出系统的优越性。视频媒体流是近年来网络用户占有量最多的一类文件,随着消费者带宽的进一步增加,越来越多的人希望得到像视频点播这样的多媒体应用。传统的C/S架构在当用户数目急剧增加时,容易产生服务器过载现象,使用服务器集群或分布式系统成本增大。Bit Torrent能够较好地降低服务器负担,提高系统的扩展性和健壮性。但是Bit Torrent针对普通大文件的共享设计,对文件的片段选择是无序进行的,不能有效地支持视频大文件的点播和直播。文中针对视频大文件的点播需求,对Bit Torrent协议的片段选择算法进行优化,实现了视频文件的点播和直播。展开更多
传统的C/S架构在当用户数目急剧增加时,容易产生服务器过载现象,使用服务器集群或分布式系统成本增大。BitTorrent协议是一种基于P2P(Peer to Peer)的文件共享协议,具有"用户越多,下载速度越快"的特点,尤其是针对大文件的下载,能够...传统的C/S架构在当用户数目急剧增加时,容易产生服务器过载现象,使用服务器集群或分布式系统成本增大。BitTorrent协议是一种基于P2P(Peer to Peer)的文件共享协议,具有"用户越多,下载速度越快"的特点,尤其是针对大文件的下载,能够较好的降低服务器负担,提高系统的扩展性和健壮性。更能体现出系统的优越性。但其缺点是为了追求下载速度而牺牲了文件下载的顺序性。展开更多
In this paper,we present the results of the BitTorrent measurement study.Two sources of BitTorrent data were utilised:metadata files and the logs of one of the currently most popular BitTorrent clientsμTorrent.Experi...In this paper,we present the results of the BitTorrent measurement study.Two sources of BitTorrent data were utilised:metadata files and the logs of one of the currently most popular BitTorrent clientsμTorrent.Experimental data were collected for fifteen days from the popular torrent-discovery site thepiratebay.org(more than 30 000 torrents were captured and analysed).During this period the activity and logs of an unmodified version ofμTorrent client downloading sessions were also captured.The obtained experimental results are swarm-oriented,which allows us to look at BitTorrent and its users from an exchanged resources perspective.Moreover,comparative analysis of the clients’connections with and without theμTP protocol is carried out to verify the extent to whichμTP improves BitTorrent transmissions.To the authors’best knowledge,none of the previous studies have addressed these issues.展开更多
文摘传统的C/S架构在当用户数目急剧增加时,容易产生服务器过载现象,使用服务器集群或分布式系统成本增大。BitTorrent协议是一种基于P2P(Peer to Peer)的文件共享协议,具有"用户越多,下载速度越快"的特点,尤其是针对大文件的下载,能够较好的降低服务器负担,提高系统的扩展性和健壮性。更能体现出系统的优越性。但其缺点是为了追求下载速度而牺牲了文件下载的顺序性。
基金partially supported by the Polish National Science Center under Grant No.2011/01/D/ST7/05054
文摘In this paper,we present the results of the BitTorrent measurement study.Two sources of BitTorrent data were utilised:metadata files and the logs of one of the currently most popular BitTorrent clientsμTorrent.Experimental data were collected for fifteen days from the popular torrent-discovery site thepiratebay.org(more than 30 000 torrents were captured and analysed).During this period the activity and logs of an unmodified version ofμTorrent client downloading sessions were also captured.The obtained experimental results are swarm-oriented,which allows us to look at BitTorrent and its users from an exchanged resources perspective.Moreover,comparative analysis of the clients’connections with and without theμTP protocol is carried out to verify the extent to whichμTP improves BitTorrent transmissions.To the authors’best knowledge,none of the previous studies have addressed these issues.