关键词: 网格计算, 智能代理, 负载平衡, 容错

Abstract: To deal with the load balancing and fault tolerance in grid computing environment, a distributed scheduling model oriented to tradition and grid service execution mechanisms was proposed. In this model, redundancy and intelligent Agent were applied to enable service-level load balancing and fault tolerance, whilst operation process of the task-level case was considered. To improve the scheduling efficiency, a new definition, degree of credit, was introduced to concisely denote availability of grid resources and grid services, and it was also an important parameter in decision-making and Agent implementation. Context Agents were responsible for sensing the context of the grid, and balance Agents were enforced to automatically serve as the scheduler for dynamic load adjustment and fault tolerance. Among Agents, information exchanges were conducted via an Agent communication language. Corresponding simulation tests were implemented and their results indicated that this model and its supplementary mechanisms were suitable to grid environments.

Key words: grid computing, intelligent Agent, load balancing, fault tolerance