Web Delay Analysis and Reduction by Use of Dispatcher-based and DNS-based Web Server Clusters

• Main Authors: Yi-Chao Wu, 吳亦超
• Other Authors: Ying-Wen Bai
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/47241340928810142515

碩士 === 輔仁大學 === 電子工程學系 === 91 === Based on our paper survey, we have not found any research for quantitative analysis on the load balancing of Web server clusters. In this paper, we propose quantitative analysis for Dispatcher-based and DNS-based web server clusters. We compare the performance from the queuing models for Dispatcher-based and DNS-based web server clusters. We also design the relative mathematical models for Dispatcher-based and DNS-based web server clusters by queuing theory. We use QNAT(Queue Network Analysis Tool) to do the simulations and use our results and that of TK Solver to verify our mathematical models. In order to increase our simulation performance, we design a simulation module for Dispatcher-based clusters. We also propose a new load balancing for the DNS-based clusters called two-pass load balancing. This method will make our load balancing better. In addition, the most important key result is the new design by utilizing a looking-up table by a mean of a precomputing Hessian matrix. This method achieves the load balancing without any complex computer computation. Finally, we compare the operation characteristics of Dispatcher-based and DNS-based web based clusters to learn their advantages and disadvantages.