Abstract: The general target of request scheduling is to maximize throughput and minimize response time under the condition that existing system resource is in full use.But for a busy business Web system with the goal of revenue gene-ration,it is crucial to increase the completion rate of transaction related requests and requests from VIP.Aiming at the multiple objectives of request scheduling for business Web server,the multi-dimension criterion for reward-driven request classification was firstly presented.Then,based on the definitions of request priority and scheduling priority,the algorithm of multi-objectives dynamic priority scheduling was proposed,which can provide DiffServ and QoS guarantee adaptively for business Web system under the variety workload.At the same time,the dynamic scheduling mechanism was introduced based on one-step-ahead overload estimation instead of the workload measurement to avoid the control delay.Simulation experiment shows the validity of this scheduling mechanism and algorithm.Through the comparison of the completion rate of transaction requests as well as the average response time with that of the traditional method FCFS,MODP proves its preferential principle under not only lower workload but also overload condition.

Key words: Request classification,Request priority,Request scheduling,Scheduling optimization,Business Web server