An SPN-Based Integrated Model for Web Prefetching and Caching

The World Wide Web has become the primary means forinformation dissemination. Due to the limited resources of the networkbandwidth, users always suffer from long time waiting. Web prefetchingand web caching are the primary approaches to reducing the userperceived access latency and improving the quality of services. In thispaper, a Stochastic Petri Nets (SPN) based integrated web prefetchingand caching model (IWPCM) is presented and the performance evaluationof IWPCM is made. The performance metrics, access latency, throughput,HR (hit ratio) and BHR (byte hit ratio) are analyzed and discussed.Simulations show that compared with caching only model (CM), IWPCM canfurther improve the throughput, HR and BHR efficiently and reduce theaccess latency. The performance evaluation based on the SPN model canprovide a basis for implementation of web prefetching and caching andthe combination of web prefetching and caching holds the promise ofimproving the QoS of web systems.