代理服务器中基于对象的限定预取策略研究  

A Study of the Object-Based Limited Cache Prefetching Strategy in Proxy Servers

作　　者：任小波[1] 杨忠秀[1] 宋加涛[1] 

机构地区：[1]宁波工程学院电子与信息工程学院,浙江宁波315016

出　　处：《计算机工程与科学》2009年第3期16-18,48,共4页Computer Engineering & Science

基　　金：浙江省教育厅科研资助项目(20050014);浙江省自然科学基金资助项目(Y105239)

摘　　要：预取作为一种主动缓存技术可用于提高缓存命中率,但其效果好坏很大程度上取决于所采用的预取策略。本文提出了一种代理服务器下基于对象的限定预取策略,通过调整代理服务器中预取空间的大小,防止无效页面占用过多的缓存空间,提高了缓存的利用率,从而获得较高的命中率。实验表明,基于对象的限定预取策略命中率远远高于LRU策略,并且相对于基于对象的LRU策略也有明显的改善。Prefetching is an active cache technique. It can be used to improve the cache hit ratio. But its performance greatly depends on the prefetching model employed. In this paper, a novel limited cache prefetching strategy based on web objects is presented. The proposed strategy can adaptively adjust the size of the prefetching cache and prevent ineffective pages from excessively occupying the cache space, resulting in a higher cache utilization rate and an enhanced web hit ratio. Experimental results show that the web hit ratio based on our proposed method is much higher than that based on the Least Recently Used （LRU） strategy, and that based on the web object-based LRU strategy.

关 键 词：cache策略 基于对象策略 限定预取 代理服务器 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]