区分服务在多层Web应用中的实现

通过对三层服务器的构架分析，突破了常用的传递函数方法，建立了基于区分服务的MIMO系统状态空间模型，并在此基础上应用控制理论中的极点配置和状态反馈方法设计控制器，对不同优先级在不同Web层次上进行资源分配，实现其比例延迟保证。实验证明，原系统可近似为一组低阶线性方程，且在所设计的控制器作用下可达到良好的区分效果。

Differentiated Services of Multi-tier Web Applications

Based on the analysis of threctier Web applications,a state space model of a MIMO system supported differentiated service was proposed which breaks through the commonly transfer function ways. Then the controller was designed by pole placement and state feedback of control theory to adjust the resource quotas assigned to different classes in every tier and achieve the proportional delay guarantees. The experiments demonstrate that it is feasible to approximate the system to a group of low-level linear equations and the proposed controller can hold the relationship between different classes.