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Analytical and Experimental Evaluation of ClusterBased WWW Servers
Analytical and Experimental Evaluation of
Cluster-Based Network Servers
Enrique V. Carreray and Ricardo Bianchiniy+
y COPPE Systems Engineering + Department of Computer Science
Federal University of Rio de Janeiro University of Rochester
Rio de Janeiro, Brazil 21945-970 Rochester, NY 14627
fvinicio,ricardog @cos.ufrj.br
University of Rochester Technical Report 718 – August 1999
Abstract tion is oblivious to the contents of the different caches. Although
this caching strategy performs well when a small set of documents
In this paper we use analytic modeling and simulation to evaluate accounts for a large percentage of requests and the average size of
network servers implemented on clusters of workstations. More the files is small, the files serviced by network servers are becom-
specifically, we model the potential benefits of locality-conscious ing larger and more numerous, especially with the proliferation of
request distribution within the cluster and experimentally evaluate multimedia (image, audio, and video) files and virtual servers [7].
the performance of a cluster-based server (called L2S) we de signed Under these adverse circumstances, using the set of memorie s of
in light of our experience with the model. Our most important mod- the cluster as a single large cache and distributing request s among
eling results show that locality-conscious distribution on a 1
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