利用无私节点改善基于支付机制P2P应用的性能  

Improving the Performance of Payment Mechanism Based P2P Application with Altruistic Nodes

作　　者：彭冬生[1] 林闯[1] 刘卫东[1] 

机构地区：[1]清华大学计算机科学与技术系,北京100084

出　　处：《计算机学报》2008年第6期953-959,共7页Chinese Journal of Computers

基　　金：国家自然科学基金(90412012);国家"九七三"重点基础研究发展规划前期研究专项基金(2006CB708301)资助~~

摘　　要：P2P应用中引入支付机制能够激励用户共享自己的资源来换取他人的服务,但缺点是用户获取货币能力不均衡会导致一些用户难以获得服务.文中提出加入一定的无私节点来提供基本服务保障时间来改善网络可用性的思路,并采用排队论理论对加入无私节点的网络性能进行了建模分析,得出系统请求平均等待时间、请求分配比例、服务保障时间和无私节点比例之间的函数关系,对于评估和优化系统性能有一定的指导意义.While using payment mechanism in P2P resource-sharing application encourages users to share resources in exchange for better services, the disadvantage is that the user＇s ability to earn money is unbalanced such that some users can hardly get services. By introducing some altruistic nodes to provide the guaranteed services, the availability of the network can be improved. The performance of the network with altruistic nodes is modeled and analyzed using queueing theory. Parameters of average request waiting time, percentage of the requests served by altruistic nodes and ratio of the altruistic nodes are formulated, which can be used as guidelines to the system performance evaluation and optimization.

关 键 词：性能分析 排队论 建模 支付机制 P2P 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]