Web服务器群的QoS确保及其接纳控制研究

(南京大学计算机软件新技术国家重点实验室南京 210093) (南京大学计算机科学与技术系南京 210093) (lzdong@dislab.nju.edu.cn)

Research on Ensuring QoS and Its Admission Control in Web Servers

(State Key Laboratory for Novel Software Technology, Nanjing University, Nanjing 210093) (Department of Computer Science and Technology, Nanjing University, Na njing 210093)

摘要: WWW访问的爆炸性发展正是Internet成功的重要原因，然而目前的Web服务器却缺乏相应的QoS机制，导致在过载时造成巨大的经济损失.一个提供多类服务的多服务器Web平台的服务质量确保体系被提出来，它以服务响应延迟为核心度量标准，将同一类服务抽象为一台虚拟服务器，并以该度量黏合起系统的各个组件.同时据此提出了一个动态自适应的服务接纳算法( DASAC).测试表明，即使经历严重的过载与业务突发，也能保证用户感知的服务质量.
- Web服务器 /
- 服务质量 /
- 服务响应延迟 /
- 接纳控制
Abstract: The explosive growth in WWW is the main cause of Internet success. But because t he current Web servers architecture is short of QoS ensuring mechanism, it leads to significant revenue losses while server is overloaded. A QoS ensuring archit ecture for Web servers which provide multi-class service is presented in this pa per. It uses (SRD) service response delay as the core measurement criterion of t he architecture. With SRD, one class service is abstracted to a virtual server, and every component of a system are glued together. And a dynamic adaptive servi ce admission control algorithm (DASAC) is also presented. Experiments show that, although suffering severe overloading and burst, the user-perceived QoS can be ensured.
- Web servers /
- QoS /
- service response delay /
- admission control