| P2P网络节点随机行为对文件规模的影响 |
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| 引用本文： | 方群,吉逸,吴国新. P2P网络节点随机行为对文件规模的影响[J]. 东南大学学报(自然科学版), 2007, 37(5): 782-786 |
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| 作者姓名： | 方群 吉逸 吴国新 |
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| 作者单位： | 东南大学计算机科学工程学院,南京,210096;安徽师范大学数学计算机科学学院,芜湖,241000;东南大学计算机科学工程学院,南京,210096 |
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| 基金项目： | 安徽省高校青年基金资助项目(2007jq1061) |
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| 摘 要： | 基于随机过程理论建立文件共享P2P网络模型,利用该模型系统地分析节点下载、合作、欺骗以及加入/退出等多种动态行为对文件规模及相关的平均负载率、下载成功率、平均下载次数等性能的影响.得出文件规模对下载率和退出率较敏感,存在平稳极限分布;合作率显著影响平均负载率,而欺骗率严重影响下载成功率及平均下载次数.以上结论可作为相应系统调控机制的优化目标及评价参考.该模型为进一步研究P2P系统性能提供一种简单有效的理论方法.
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| 关 键 词： | P2P 文件共享 动态行为 生灭过程 |
| 文章编号： | 1001-0505（2007）05-0782-05 |
| 修稿时间： | 2007-03-29 |
Impact of peers' stochastic behaviors on file population in peer-to-peer network |
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| Fang Qun,Ji Yi,Wu Guoxin. Impact of peers' stochastic behaviors on file population in peer-to-peer network[J]. Journal of Southeast University(Natural Science Edition), 2007, 37(5): 782-786 |
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| Authors: | Fang Qun Ji Yi Wu Guoxin |
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| Affiliation: | 1. School of Computer Science and Engineering, Southeast University, Nanjing 210096, China;2. School of Mathematics and Computer Science, Anhui Normal University, Wuhu 241000, China |
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| Abstract: | A stochastic model of file sharing P2P(peer-to-peer) network is established.Based on the model,the impact of peers' dynamic behaviors(download,cooperation,cheating,joining and departing) on file population and other relative system performances are systematically analyzed.It is concluded that file population is sensitive to download rate and departing ratio but has a balanced limit distribution.In addition,cooperation ratio remarkably influences mean load ratio while cheating ratio has distinct impact on success download probability and mean download times.These conclusions can be used to guide and evaluate optimizing system management mechanism.The truth that results of experiment coincide with theoretical results proves that the stochastic model is simple and effective. |
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| Keywords: | peer-to-peer file sharing dynamic behavior birth-death process |
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