针对云计算中虚拟资源的优化配置问题,提出了一种基于状态空间连续逼近的云计算虚拟资源的优化配置方法.首先利用一个带时间扩展的标记转移系统,对虚拟资源在申请和调用过程中各对象的动作行为以及状态转移关系进行描述；然后根据对象之间的并发关系,推导出一组能够描述系统中每种对象各状态数量随时间变化的微分方程组；最后通过求解方程组,分析在供需平衡状态下各虚拟资源的实际需求,动态地配置各虚拟资源的数量,实现虚拟资源动态优化配置的目的.%In order to deal with the difficulties in the configuration of virtualized resources in cloud computing, an optimal configuration method based on continuous state-space approximation is proposed. By the use of the time-extended LTS, the actions and state transition relations of the objects that participated in the process of virtualized resources applying and allocating could be precisely described. Then, according to the concurrency relation among the objects, a set of ODE is generated which can describe the variable trend of the objects during working time. By solving out the ODE, the amount of virtualized resources to meet the demand can be calculated out, and the virtualized resources could be dynamically configured according to the results, so as to realize the purpose of optimal configuration of virtualized resources.
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