内容分发网络性能测量方法研究与实现

Research and Implemention on Network Performance Mesurement of Content Distribution Network

内容分发网络 (CDN)是新型的网络加速技术 .提出了一种新的 CDN性能测量方法 :将 CDN性能测量融入到网络测量基础设施之中 ,CDN提供者、内容提供者或终端用户可以根据需要随时、方便的测量、评价 CDN性能 ,克服了以往测量方法测量周期长、测量规模扩展性差以及数据资源利用率低等缺点 .基于此方法 ,设计并实现了一个集成在 CNMI下的 CDN性能测量系统 :CDNPMS,系统使用灵活简单 ,可以从 CDN外部测量用户感知的 (Client- perceived) CDN性能 ,并且用此系统对目前最大的 Akamai CDN进行了成功测量 .

The Content Distribution Network (CDN) is a novel network technology that effici ently delivers the content to end users on behalf of origin Web sites. This pape r presents a new CDN performance measurement method that integrates CDN performa nce measurement job into the network measurement infrastructure. The CDN compani es, content providers and end clients can measure CDN performance according to t heir specific purposes at any time. This method overcomes the drawbacks of exist ing measurement methods, such as extended measurement duration, low scalability, and low usability of the measurement data. CDNPMS (CDN Performance Measurement System), a system to measure client-perceived performance of CDN, is developed using this method. A preliminary performance study was conducted on Akamai CDN u sing this system.