Performance Improvement Studies in Accessing Web Documents

As the World Wide Web has now become the standard interface for interactive information services over the Internet, the perceived latency in WWW interaction is becoming an important and crucial issue. Currently, Web users often experience response delay of several seconds or even longer to non-local Web sites especially when the pages they attempt to access are very popular. For WWW to be acceptable for general daily use, the response delay must be reduced. The potential solutions to the problem lie in the extensive use of caching (disk based) and prefetching in WWW. Both caching and prefetching explore the patterns and knowledge in the Web accesses. This thesis describes and tests the efficiency of a batch prefetching update (refreshing) in accessing HTTP and FTP documents on the global Internet. The update is scheduled to run at idle time when the traffic is less congested and the server activity is low. The batch refreshing effort would be fruitful when the refreshed documents are really requested before they tum stale again. The effectiveness of the batch refreshing is verified by running a statistical analysis of the access log files. In the first part of the study, a Proxy Server at the LAN of FTMSK, ITM was set-up, configured and monitored for the use of 400 users. Access log files are collected and analysed for a period of six months. The analysis result would be a benchmark for the caching proxy with batch refreshing in the second part of the work.

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