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Example2

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					Web Proxy Caching Model
Web Servers

Aggregate Workload

Proxy server

Web Clients

Factors and Levels
• Cache size • Cache Replacement Policy
– Recency-based LRU – Frequency-based LFU-Aging – Size-based GD-Size

• Workload Characteristics
– One-timers, Zipf slope, tail index, correlation, temporal locality model

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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posted:5/24/2009
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