一种P2P流媒体系统中的缓存替换算法  

A cache replacement algorithm of media streaming distribution based on P2P

作　　者：张继荣[1] 刘艳君[1] 

机构地区：[1]西安邮电学院通信与信息工程学院,陕西西安710061

出　　处：《微型机与应用》2011年第7期65-68,共4页Microcomputer & Its Applications

摘　　要：针对视频节目受欢迎程度不同的特性,提出一种P2P流媒体系统中的缓存替换算法,通过将系统中的全部视频片段分类,为其赋予不同的优先级,并周期性地更新该值,同时考虑视频片段被访问次数和最近被访问的情况,使得被替换出存储空间的片段更加合理。实验表明,该算法能提高缓存命中率及系统的启动延时,性能较优。According to the different characteristics of programme＇s popularity, the paper proposes a cache replacement algorithm of media streaming distribution based on P2P. All of the video segments are divided into three categories. Before entering the system, different priorities is given and upgraded periodically. And the visited times and frequencies of the segments are considered, so it is more reasonable when the programme block is moved out of cache. The simulation experiments indicate that this algorithm can make the caching system maintain better hit ratio and start delay.

关 键 词：流媒体 P2P 缓存替换算法 流行度 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]