WWW中缓存模型的优化设计

Optimal Design for Cache Model in WWW

ＷＷＷ提供了方便的手段来访问远程信息资源，对于Ｗｅｂ用户而言，衡量Ｗｅｂ服务质量的一个重要指标就是检索信息所花费的时间。缩短检索时间的途径很多，此文主要介绍通过设置缓存机制，降低用户对资源访问请求次数，达到缩短用户直观感觉上的检索时间的方法。并讨论一种基于Ｃ／Ｓ结构的缓存模型，提出了新的缓存替换算法，综合考虑了文档长度，网络负载等参数，实现了缓存模型的优化。经过实验验证，该算法优于目前的缓存替换算法。

The quality of the service provided by the World Wide Web(WWW) depends in an important way on the time required to retrieve the information This time in turn depends on a number of parameter, in particular the load in the network Overload is avoided by using mechanism such as caching that can minimize the resource requirements from users In this paper, we consider performance issue related to caching, and advocate the use of novel cache replacement algorithm which takes document size and network load into account so as to minimize the retrieval time perceived by users Finally, we show expe￣rimental data collected at CERNET with this algorithm