Time-domain analysis of Web cache filter effects
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This paper uses trace-driven simulation and syntheticWeb workloads to study the request arrival process at eachlevel of a simple Web proxy caching hierarchy. The simulationresults show that a Web cache reduces both the peakand the mean request arrival rate for Web traffic workloads.However, the variability of the request arrival pro-cessmay either increase, decrease, or remain the same afterthe cache, depending on the input arrival process andthe configuration of the cache. If the input request arrivalprocess is self-similar, then the filtered request arrival processremains self-similar, though with reduced mean. Furthermore,the superposition of Web request streams frommultiple child caches results in a bursty aggregate requeststream. Finally, we find that a Gamma distribution providesa flexible means of modeling the request arrival count distributionin hierarchical Web caching architectures.