云QoS映射模型及其面向服务选择的算法

A Mapping Model of Cloud QoS and its Service Selection-oriented Algorithm

随着云计算的不断发展,具有QoS保证的服务选择方法成为云服务领域的一个重要研究内容,其中用户QoS需求到云服务资源的映射关系是此类方法研究中的一个关键问题。论文从用户、SaaS和IaaS三个层面分析了确定型的QoS指标与云资源类型的层次关系,建立了用户QoS需求到云资源的映射模型。基于QoS映射模型,提出了一种以用户QoS需求为中心的云资源选择方法,方法中结合了熵权法和TOPSIS方法。最后在实验阶段通过实例给出了QoS到资源映射方法的实现过程。实验表明QoS到资源的映射模型与基于此的服务选择方法对于支持具有QoS保证的按需服务的运营模式具有一定参考价值。

With the development of cloud computing,the QoS guaranteed service selection method becomes an important research issue in the cloud services domain,in which the mapping relationships from QoS requirements of user to cloud service resources is a key problem.In this paper,the hierarchy of deterministic QoS metrics and cloud resource type is analyzed from the following three levels,user,SaaS and IaaS.And then a mapping model from QoS requirements of user to cloud service resources is built.Based on the mapping model,a cloud service selection method which focuses on the QoS requirements of user is presented.The method combines entropy weight method with TOPSIS method.Finally,an implementation of the mapping method is given through an instance in the experiments.Experimental results show that the mapping model from QoS to resources and the service selection method based on the model has certain reference values for the operating mode of on-demand service with QoS guarantee.