基于涌现视角的类BitTorrent性能分析模型  

A Performance Analysis Model for BitTorrent-Like Peer-to-Peer Systems Based on the Notion of Emergence

作　　者：黄红兵[1] 任传俊[1] 金士尧[1] 

机构地区：[1]国防科学技术大学计算机学院,湖南长沙410073

出　　处：《电子学报》2010年第2期307-314,共8页Acta Electronica Sinica

摘　　要：BitTorrent作为一种典型的实际P2P系统,在理论和实践中引起了广泛关注.给出一个有效的类BitTor-rent系统分析模型一直是人们努力的一个方向.本文基于系统科学中的涌现概念,从微观到宏观来研究BitTorrent系统,给出了BitTorrent系统的微-宏观分析模型.首先从相对清晰的系统微观(结点)状态和行为入手,选取表征BitTorrent结点的参数,称为微观参数;根据BitTorrent的结点行为,基于这些微观参数,给出系统的微观行为描述;选取表征Bit-Torrent宏观态的变量,称为宏观变量;然后依据宏观变量与微观变量的关系,基于微观行为描述,建立系统的宏观演化方程;进而研究系统的宏观特性.实验表明该模型能够有效刻画BitTorrent系统的行为.As a typical and practical peer-to-peer system, BitTorrent gets amount of attention in theory and practice. The work that has been taken great efforts is to provide an effective model for analyzing BitTorrent. Based on the notion of emergence in system science, this paper investigates BitTorrent in a broad view which is from microscopic to macroscopic, and gives a micromacro analytical model for them. To obtain this model, we start from the states of microscopic BitTorrent, i. e. nodes＇ states, and get the parameters that represent a node,called microscopic parameters.Based on these parameters and the activities of a node,the microscopic behaviors of BitTorrent are characterized. At the same time, several macroscopic parameters are chosen to describe systematic states of BitTorrent. Based on the microscopic behaviors, by exploring the relationship between microscopic and macroscopic parameters, the macroscopic equations characterizing BitTorrent＇ s evolvement are established. And based these equations, macro properties of BitTorrent can be obtained. Experiment results indicate that this model can effectively catch the behaviors of BitTorrent.

关 键 词：BITTORRENT系统 性能分析 涌现 微-宏观模型 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]