Abstract: This article introduces four Load Balance algorithms.Round Robin（RR）,Weighted Round Robin（WRR）,Least Connection（LC）and Weighted Least Connection（WLC）.How to simulate these four algorithms is explicated.According to the simulation results,the article gives the performance curves of server load balance.These algorithms are analyzed based on the curves.And we establish three different simulation models,deeply analyze and compare the four algorithms.

Key words: load balance algorithm, Round Robin（RR）, Weighted Round Robin（WRR）, Least Connection（LC）, Weighted Least Connection（WLC）

摘要： 介绍了Round Robin（RR）,Weighted Round Robin（WRR）,Least Connection（LC）和Weighted Least Connection（WLC）四种负载均衡算法,对这四种算法进行性能仿真。根据模拟得到的相关数据绘制各个算法的负载均衡度性能曲线,并对每个算法进行了性能分析。在此基础上设置三种不同的模拟模型,对四种算法进行更深入的测试和性能比较。

关键词: 负载均衡算法, Round Robin（RR）算法, Weighted Round Robin（WRR）算法, Least Connection（LC）算法, Weighted Least Connection（WLC）算法