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Current prefetching models mainly depend on prediction algorithms to fetch Web objects in advance, but lack the consideration of the prefetchability of Web objects. If the prefetchability of the objects can be considered before prefetching, unnecessary prefetching will be decreased to some extent. On one hand, it can improve hit ratio of prefetching algorithms, on the other hand it can reduce unnecessary...
Two metrics are commonly utilized in the performance evaluation of Web caching replacement policies: hit ratio and byte hit ratio. Most of the researches made the assessment by only considering one of the two metrics or based on the experimental results, and have the limitation of lacking the performance evaluation from the viewpoint of relationship between the two metrics, which is discussed in detail...
Zipfs law holds the promise of more effective design and use of Web cache resources. This paper discusses how to make use of Zipfs law to model the Web objects' popularity. For the high frequency objects, Zipf 1/sup st/ law is employed to set up the model; for the low frequency objects, Zipf 2/sup nd/ law is borrowed to simulate. Our model overcomes the limitation of only considering one-time referencing...
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