Performance Analysis Of Threshold Priority's System And Study Of Optimization Question

Recently, with rapid development of computer technology, it is essential to forecast, evaluate and analyze performance of computer network and system, in order that the reasonable target of the system attains the best. Queuing theory, that is an important tool to studying the random system, can afford some theory base and instruct of performance's improvement of the network system and the network design.This paper analyzes threshold priority's operation and establishes mathematic model with the theory of queue. And through computer simulation, it gets different threshold's effect to two kinds of cell average residence time and cell losing ratio, and with increasing of a kind of cell, it gets effect to two kinds of cell average residence time and cell losing ratio. The computer simulation results show that threshold priority schemes is able to deduce high-priority cell losing ratio while allowing the low-priority cell losing ratio to degrade as little as possible if appropriate threshold is chose, this is able to improve the quality of service for high-priority cell.In queue system design or management, it is essential to consider the benefits of clients and service departments in order that the reasonable target of the system attains the best. According to above theory, the fee model of threshold priority system is established in this paper. The simulation model established by the theory of queue is used to analyze quantitatively the cost of threshold priority system. The results show that with increasing of service rate, the queue losing fee reduces for sojourn time and losing rate reduced, while the service fee increases. The total system fee has least value and the corresponding service rate is the optimization value. In queue system design, this analysis method is very important.