具有高缓存写入效率的流媒体分段缓存方法  

A New Segmented Cache of Streaming Media with High Cache-Writing Efficiency

作　　者：马杰[1] 樊建平[2] 

机构地区：[1]中国科学院研究生院,北京100080 [2]中国科学院计算技术研究所

出　　处：《计算机学报》2007年第4期588-596,共9页Chinese Journal of Computers

摘　　要：流媒体代理服务器缓存是能有效降低网络传输负载的技术.长时间持续和大传输码率的两个流媒体访问特点使得流媒体代理服务器面临的负载问题十分严峻.流媒体缓存方法是流媒体代理服务器的核心组成,其引发的缓存写入操作数量对代理服务器负载有着重要的影响.文中从流媒体缓存的执行特点入手,给出了一种高网络传输减少效果和低缓存写入负载的流媒体分段缓存方法.缓存写入与访问热度相结合是该缓存方法的主要特点.在实验测试中证明了该缓存方法相比目前减少网络传输最好的Adaptive&Lazy缓存方法能减少2/3的缓存写入负载,并能获得同样的网络传输减少效果.Accessing multimedia files with streaming media technique will generate data streams with long time existed and high bandwidth consumed. Streaming media cache in the proxy server does good in reducing network traffic of streaming media. The continuous data transmission brings great challenge to the proxy sever, and it is importance to find out how to reduce cachewriting load in order to avoid the damage to the proxy service. Cache method is the core part of the streaming media cache, since it determines how proxy server works. This paper introduces a new streaming media cache method which has good effect both on improving cache-writing efficiency and reducing network traffic. Through the simulation by actual access logs, the new cache method has the same transmission saving and promote the writing efficiency as three times as the Adaptive ＆ Lazy method.

关 键 词：代理服务器 流媒体缓存 分段缓存方法 缓存写入效率 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]