The Modeling Research And Performance Evaluation Of Cluster Server System

With the popularization of the network, the network servers have to provide more and more services for clients. Even the performance of a single server is high, the service which is provided by it is very limited. In visit peak period, the server is easily overloaded. Therefore, the cluster server system produced.As the ordinate computer system, the performance of the cluster server system includes two aspects: one is its reliability and usability, the other is its efficiency. There are three types included in efficiency. They are throughput, response time and utilization. Petri net is a useful graphics and math modeling tool which can be used in many systems and fields. Its characteristics include concurrency, nondeterminacy, asynchronism and distributed ability to describe and analyze. Petri nets have the functions as flowchart diagram and network map which can describe with visible method. It also can describe dynamic abilities of simulation systems with'token'.The thesis's background is the project named"the Performance Inspection and Feedback Control of Web-Service System"of a company. The thesis proposes integrated control idea, which adopts complex balancing strategy used in request distributor cooperating with priority of request used in servers. The thesis models cluster servers system based on the theory and technique of stochastic high-level Petri net, then analysis the performance of system.The research is to analysis and simulate the performance of the cluster server system, which is modeled with Petri net. This implements load balancing and QoS control of the system. It is very helpful for the related researches.