Research And Application Of Load Balancing Algorithm Based On Vehicle Video Monitoring System

With the rapid development of Chinese economic level and science and technology,vehicles have become an indispensable part of urban and family life.With the rapid increase in the number of vehicles brought about by the safety regulatory issues,people urgently need a good vehicle monitoring System.The rapid increase in user volume and concurrent Web traffic makes it difficult for a single Web server to respond quickly and quickly to high-concurrent access requests,prompting people to explore new technologies to solve such problems.Cluster system based on load balancing is one of the solutions to this problem.At present,many domestic and foreign companies use their own cluster system or load balancing software.However,the application of these technologies have limitations.This paper has studied the vehicle video monitorrning system and load balancing technology for Web clusters objectively,then designed and implemented the vehicle video surveillance system client,and proposed an improved load balancing algorithm for the system.The main contents of this paper are as follows:(1)Aiming at the situation of high concurrent and high load on the Web server,a dynamic feedback improved algorithm based on Weighted Least-Connections(WLC)algorithm is proposed by studying the traditional load balancing algorithm.Considering that the limitation of the WLC algorithm,the design of the improved algorithm is given: the evaluation of the node performance and the calculation of the real-time load,by setting the threshold and adjust the cycle to change the size of the server weight,and then combine the WLC algorithm to assign tasks reasonably.(2)Using the network simulation software OPNET,in the network domain,node domain,process domain modeling,select the evaluation index: HTTP response time,server delay and CPU utilization.Then compare and simulate the weighted Round-Robin(WRR)algorithm,Weighted Least-Connections algorithm and the improved dynamic feedback load balancing algorithm based on WLC in the paper,analyze their datas,and prove that the algorithm is reasonable theoretically.(3)In order to verify the algorithm is applicale for the vehicle monitoring system better,the paper gives a design and implement for the B/S vehicle monitoring system client with the use of existing technology.The client's main function modules include: user login authentication and rights management,video monitoring module and map display module,and give the specific analysis and details of each module.(4)The load balancing module of Linux virtual server(LVS)is used to build a small Web cluster in the lab environment,and the corresponding server is configured to test the improved algorithm.The test results show that the improved algorithm based on Weighted Least-Connections can solve high concurrent problems well.