一种Web集群系统的动态分离式调度策略  

Dynamic segregation scheduling policy for Web cluster

作　　者：汤迪斌[1] 倪宏[2] 陈晓[2] 

机构地区：[1]中国科学院研究生院,北京100039 [2]中国科学院声学研究所国家网络新媒体工程技术研究中心,北京100080

出　　处：《计算机工程与应用》2008年第16期1-3,共3页Computer Engineering and Applications

基　　金：国家“十一五”科技支撑计划重大项目(the National Great Project of Scientific and Technical Supporting Programs Funded by Ministry of Science&Technology of China during the 11th Five-year Plan No.2006BAH02A22)

摘　　要：静态分离式调度策略(SSSP)不能有效地分配服务器资源。动态分离式调度策略(DSSP)对静态请求和动态请求分别以请求的文件和用户会话为单元进行调度。请求分发器监测后端服务器的状态,按资源使用情况将服务器区分为轻载、重载和过载,轻载服务器可以接收新的请求单元,重载服务器不接收新请求单元,但继续为已接收的请求单元服务,过载服务器迁移部分请求单元到轻载服务器。试验结果表明,DSSP的效率明显优于SSSP。Static Segregation Scheduling Policy （SSSP） can＇t allocate server resources effficiently.Proposed Dynamic Segregation Scheduling Policy （DSSP） uses different servers to serve static and dynamic requests,schedules static and dynamic requests in unit of requested files and user sessions respectively.The dispatcher monitors the status of back-end servers,and classifies them into three categories：lightly loaded,heavily loaded and over loaded.Lightly loaded servers continue to accept new request units, heavily loaded servers don＇t accept new request units,but keep on serving accepted request units,over loaded servers transfer some of their accepted request units to lightly loaded servers.Experiment shows that DSSP is better than SSSP.

关 键 词：WEB集群 请求分发 调度策略 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]