Evaluating server-assisted cache replacement in the web

Edith Cohen, Balachander Krishnamurthy, Jennifer Rexford

Research output: Chapter in Book/Report/Conference proceedingConference contribution

16 Scopus citations


To reduce user-perceived latency in retrieving documents on the world wide web, a commonly used technique is caching both at the client's browser and more gainfully (due to sharing) at a proxy. The effectiveness of Web caching hinges on the replacement policy that determines the relative value of caching different objects. An important component of such policy is to predict next-request times. We propose a caching policy utilizing statistics on resource inter-request times. Such statistics can be collected either locally or at the server, and piggybacked to the proxy. Using various Web server logs, we compared existing cache replacement policies with our server-assisted schemes. The experiments show that utilizing the server knowledge of access patterns can greatly improve the effectiveness of proxy caches. Our experimental evaluation and proposed policies use a price function framework. The price function values the utility of a unit of cache storage as a function of time. Instead of the usual tradeoffs of profit (combined value of cache hits) and cache size we measure tradeoffs of profit and caching cost (average allocated cache portion). The price-function framework allows us to evaluate and compare different replacement policies by using server logs, without having to construct a full workload model for each client's cache.

Original languageEnglish (US)
Title of host publicationAlgorithms, ESA 1998 - 6th Annual European Symposium, Proceedings
PublisherSpringer Verlag
Number of pages13
ISBN (Print)3540648488, 9783540648482
StatePublished - 1998
Externally publishedYes
Event6th Annual European Symposium on Algorithms, ESA 1998 - Venice, Italy
Duration: Aug 24 1998Aug 26 1998

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume1461 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Other6th Annual European Symposium on Algorithms, ESA 1998

All Science Journal Classification (ASJC) codes

  • Theoretical Computer Science
  • General Computer Science


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