On the Scale and Performance of Cooperative Web Proxy Caching
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چکیده
While algorithms for cooperative proxy caching have been widely studied, little is understood about the performance of cooperative caching in the Web environment as it scales to large client populations. This paper uses both tracebased analysis and analytic modelling to show the potential advantages and drawbacks of inter-proxy cooperation. With our traces, we evaluate quantitatively the performance-improvement potential of cooperation between 200 small-organization proxies within a university environment, and between two large-organization proxies handling 20,000 and 60,000 clients, respectively. With our model, we go beyond those populations to project the implications for cooperative caching in regions with millions of clients. Overall, we demonstrate that cooperative caching has performance benefits only within limited population bounds. We also use our model to examine the implications of future trends in Web-access behavior and traffic.
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