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Performance Evaluation of the Distributed Object Consistency Protocol
Dilley, John; Perret, Stephane; Arlitt, Martin
HPL-1999-108
Keyword(s): World Wide Web; proxy cache; cache replacement policy; distributed object consistency protocol; performance analysis; trace-driven simulation
Abstract: This report analyzes the performance of two methods for maintaining object consistency in World Wide Web proxy cache servers: the widely used Alex adaptive TTL protocol and a proposed Distributed Object Consistency Protocol (DOCP). The goal of this report is to evaluate these approaches to web cache consistency using a realistic workload and trace-driven simulation. We examine the effect of cache replacement policies and consistency protocols on cache performance. This analysis indicates that the DOCP outperforms the Alex protocol while preventing access to inconsistent objects. DOCP also improves cache response time by serving consistent objects without communicating with the origin server to check freshness. This improves fast hit rate and reduces request demand on origin servers.
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