P2P流媒体点播的缓存机制研究  

Research on cache mechanism for VOD based on P2P network

作　　者：任立波[1] 黄桂敏[1] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2011年第5期350-354,共5页Journal of Guilin University of Electronic Technology

基　　金：广西教育厅科研项目(200911MS83)

摘　　要：针对当前P2P缓存系统中存在服务器负载以及启动延迟较大的问题,参考经济学中的价格均衡理论,设计了一种Pcache分段分布式缓存算法,采用分布式一致性算法计算视频分段的供需差和紧迫度,并根据供需差和紧迫度的大小给出相应的缓存替换算法。理论分析和仿真实验表明,该算法可以适当地降低服务器的负载以及启动延迟,能够获得较好的系统性能。Aiming at the current existing larger server＇s load and start delay in P2P caching system, referencing price equilibrium theory in economics, a kind of section distributed cache algorithm named Pcache which adopted distribu- ted averaging algorithm to compute the difference between supply and demand and the degree of urgency of video segment was proposed and corresponding replacement algorithm was obtained according to the relative superiority of the difference between supply and demand and the degree of urgency of video segments. Theoretical analysis and simulation experiments show that this algorithm can reduce consumption of server＇s load and start delay appropri- ately and obtain better performance.

关 键 词：价格均衡理论 缓存 供需差 紧迫度 

分 类 号：TN393[电子电信—物理电子学]