在网格工作流中引入服务质量,可以使网格中的资源更好地围绕用户的要求进行组织和分配,服务质量为工作流执行过程中选择成员服务提供了依据.工作流服务质量的估算和服务质量感知的工作流调度是实现服务质量感知的网格工作流的两个关键问题.基于一种网格工作流模型讨论了网格工作流的服务质量参数体系,提出了工作流服务质量的估算算法和网格工作流调度数学模型,并提出了基于遗传算法的调度方法.仿真实验表明,该调度算法具有较好的收敛性.
QoS allows for the selection and execution of Grid workflow to better fulfill customer's expections. Introducing of QoS can provide means for schedule of component services and make the execution of workfiow satisfy the requirements of users better. The estimate algorithms of QoS and QoS-awared workflow schedule are two basic problems of workfiow QoS management. In this paper, the QoS parameters of grid workflow are discussed, the corresponding QoS estimate algorithms are presented based on a Grid workfiow model, and the problem of QoS-awared gird workfiow schedule is proposed. Some QoS-awared schedule algorithms are discussed and a solution based on genetic algorithms is proposed.