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Perf Intro

Perf Intro. Slides originally from Williamson at Calgary Minor modifications are made. Web Proxy Caching Model. Aggregate Workload. Proxy server. Web Servers. Web Clients. Factors and Levels. Cache size Cache Replacement Policy Recency-based LRU (Least Recently Used)

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Perf Intro

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  1. Perf Intro • Slides originally from Williamson at Calgary • Minor modifications are made

  2. Web Proxy Caching Model Aggregate Workload Proxy server Web Servers Web Clients

  3. Factors and Levels • Cache size • Cache Replacement Policy • Recency-based LRU (Least Recently Used) • Frequency-based LFU-Aging (Least Frequently Used) • Size-based GD-Size • Workload Characteristics • One-timers, Zipf slope, tail index, correlation, temporal locality model

  4. Performance Metrics • Document Hit Ratio (DHR) • What percentage of the documents requested by the clients are satisfied directly by the proxy, without having to obtain from the Web server? • Byte Hit Ratio (BHR) • What percentage of the bytes requested by the clients are satisfied directly by the proxy, without having to obtain from the Web server?

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