关键词: 用户体验, 动态QoS优化方法, 反馈控制器, 虚拟资源

Abstract: In the case of dynamic environment and unpredictable system status, how to satisfy both functional and non-functional requirements is a very challenging problem. The traditional approach dealing with overload issue is to optimize Web service request by using request scheduling strategy. But it cannot meet the requirement of complexity and flexibility of QoS completely. Self-adaptation approach based on settings of system administrators largely depends on their subjective judgments and practical experiences. In many cases, there is a large gap between people?s estimates and actual effects. In response to these problems, this paper presents a dynamic QoS optimization approach based on user experience. The approach realizes system dynamic QoS optimization by employing a dynamic user experience computing module to compute expected response time, an outer feedback controller to adjust the number of virtual resources and an inner feedback controller to adjust the weight of each virtual resource. By comparison with a simple-rule method, this paper verifies the effectiveness of the proposed approach.

Key words: user experience, dynamic QoS optimization approach, feedback controller, virtual resource