摘要： 网格资源调度是网格管理技术中的关键组成部分，文章在研究Globus网格资源调度模型的基础上提出了一种基于资源动态性的再调度策略R2_Scheduler。资源的动态特性以及跨越多个管理域使得网格管理策略必须根据其可用性作出相应调整，R2_Scheduler通过一个启动因子p与用户进行协商，利用前一次调度的结果，在资源有限的情况下启动任务，可以避免因资源不足造成的请求失败；同时利用资源的局部性特点，把请求资源限制在一个协同调度器的作用域之内，从而减少网络通信负载。

关键词: 网格计算, 再调度, 协同调度, 启动因子

Abstract: Resource scheduling is the core administration component in grid computing. Based on the Globus framework and technologies, this paper proposes a resource rescheduling model named R2_Scheduler, with resource dynamic characteristics in mind. The scheduling strategies must be adapted according to the resources’ dynamic and cross-administration-domain characteristics. According to the preceding scheduling results, R2_Scheduler negotiates with the user who invokes the request to determine whether to startup the task or not, in the condition that resource is lack. The limitation or availability of resource is reflected by a startup-factor. With the agreement of the user, the failure of the request is avoided, and the whole system network load is reduced by restricting the resource in the same co-allocator’s management domain.

Key words: Grid computing, Rescheduling, Co-allocating scheduling, Startup-factor