基于P2P的流媒体客户端缓存管理机制的研究  

Research on the Client Buffer Cache Based on Peer to Peer for Video on Demand System

作　　者：孙昕[1] 王俊生[1] 

机构地区：[1]哈尔滨医科大学基础医学院,哈尔滨150081

出　　处：《计算机与数字工程》2012年第2期148-150,共3页Computer & Digital Engineering

基　　金：黑龙江省卫生厅科研课题(2011-176)资助

摘　　要：针对在基于P2P的点播系统中,由于客户端缓存区没有得到高效的利用而影响流媒体点播系统的服务质量问题,提出了一种新的基于混合P2P的流媒体点播模型P2P_VOD,该模型将客户端缓存分为三个区,并详细阐述了客户端节点缓存区的缓存替换机制,综合考虑了数据块备份量的均衡性和节点VCR操作的命中率,使得节目数据块在各节点间缓存得到全局优化并有效缓解了服务器负载。通过仿真对比实验,验证了该模型在启动延迟和服务器负载方面的优越性。According to the problem of the quality of service of streaming Video-On-Demand been affected by the inefficient utilize of client buffer cache in Peer to Peer（P2P） Video-On-Demand system,this paper presents P2P_VOD,a streaming media Video-On-Demand model based on hybrid P2P,the client buffer cache been divided into three partitions in this model and discusses in detail the buffer control strategy of client buffer cache,it considers the proportionality of the data blocks distribution and the hit rate of peer VCR operation comprehensively to remit the server load and optimize the distribution of data blocks between the peers,and verifies the advantages of the model in start delay and server load through contrast experiments.

关 键 词：P2P 流媒体 点播系统 客户端缓存 服务质量 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]