Web服务器集群系统QoWS研究

请求负载的增加常常导致Web服务器系统性能降低,用户期望的服务质量得不到保证,这是服务级Web系统所面临和必须解决的问题。文章提出了一种Web服务器集群环境下的负载分配策略,通过对用户请求分类、将不同类别的请求进行响应性能隔离、优先为高级别请求提供服务以及请求许可控制等手段,对不同类别的Web请求提供不同质量的服务,保证了服务级用户的服务质量。同时采用最迟分配原则,改善系统的负载均衡能力,缩短系统平均响应时间。最后通过仿真实验,验证了该策略的正确性和有效性。

Research on QoWS in Web Server Cluster System

The augment of requests often results in the performance degrade of the web server system.The quality of service(QoS)expected by users can not be guaranteed.This is the problem that service-level web system must cope with.In this paper,a load distribution strategy under web cluster environment is proposed.Through several methods in-cluding classification of the user requests,response performance isolation of different types of requests,priority service for the high-level requests and request admission control,the different quality of web service can be reached and the QoS of service-level users is guaranteed.Also according to latest distribution rule,the load balance of the system is im-proved,and average response time of the system is decreased.Lastly simulation experiments prove the correctness and efficiency of this strategy.