BitTorrent系统节点行为研究

doi:10.3969/j.issn.1000-0801.2011.01.007

Abstract

Abstract:

Measuring and characterizing peer-to-peer file-sharing systems will benefit the optimization and management of P2P systems. The designs of current P2P network are getting more complicated，and several operational mechanisms bring about the incompleteness of data or long period in measurement，such as BitTorrent system. To solve the problem，three levels are abstracted from BitTorrent system in the view of measurement in this paper，including index，peer and content. Furthermore，this paper focuses on the difficult problems in every level，and meanwhile a measurement system for BitTorrent is designed. On these bases，a measurement was performed continuously，and the behaviors of peers that contain the evolution of peers and the model of peer arrival are mainly studied. The results demonstrate that the evolution of peers and the arrival of peers follow a strong periodical law. Therefore，an improved model of peer arrival is proposed，which can be fitted well with actual data and perfect the law of peer arrival.

Key words: peer-to-peer, BitTorrent, measurement, evolution, peer arrival

Lin Ye,Hongli Zhang,Majing Su,Fei Li. A Study on the Behaviors of Peers in BitTorrent System[J]. Telecommunications Science, 2011, 27(1): 30-35.

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References 12

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		N=500				N=5 000
pn	20	50	100	200	20	50	100	200
80%	40	16	8	4	402	161	80	40
85%	47	19	9	4	474	189	94	47
90%	57	22	11	5	575	230	114	57
95%	74	29	14	6	748	299	149	74
98%	96	38	18	8	977	390	194	96

种子	热点资源	一般资源
类型	视频（电影）	视频（动漫）
大小	457.06 Mbyte	176.15 Mbyte
发布网站	bbs.wofei.net	bt.ktxp.com
发布时间	2009-4-20 16：39	2009-4-20 15：56
探测开始	2009-4-20 16：41	2009-4-20 15：58
探测结束	2009-5-19 22：03	2009-5-19 22：05
Peer总数	28 856	6 315

波峰/波谷	节点坐标（X，Y）	出现日期
波峰1	（6.09，753）	2009-04-20 22：47：03
波谷1	（14.38，256）	2009-04-21 07：04：02
波峰2	（29.71，724）	2009-04-21 22：24：09
波谷2	（37.70，280）	2009-04-22 06：23：15
波峰3	（52.74，580）	2009-04-22 21：25：57
波谷3	（63.09，214）	2009-04-23 07：46：45
波峰4	（75.03，734）	2009-04-23 19：43：01
波谷4	（87.70，213）	2009-04-24 08：23：11
波峰5	（147.29，246）	2009-04-26 19：58：32
波谷5	（157.13，92）	2009-04-27 05：49：25
波峰6	（171.55，195）	2009-04-27 20：14：08
波谷6	（179.13，79）	2009-04-28 03：49：26

波峰/波谷	节点坐标（X，Y）	出现日期
波峰1	（4.87，564）	2009-04-20 20：50：21
波谷1	（16.52，104）	2009-04-21 08：29：18
波峰2	（30.47，239）	2009-04-21 22：26：41
波谷2	（40.59，71）	2009-04-22 08：33：33

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A Study on the Behaviors of Peers in BitTorrent System

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