网格中自适应模型服务的研究  

Research on Adaptive Model-service under Grid Condition

作　　者：黄继杰[1] 李伯虎[2] 柴旭东[3] 

机构地区：[1]北京航空航天大学自动化科学与电气工程学院,北京100083 [2]航天科工集团二院,北京100854 [3]北京仿真中心,北京100854

出　　处：《计算机仿真》2008年第4期109-113,共5页Computer Simulation

基　　金：国家863计划信息领域专项资助(2004AA104330)

摘　　要：在网格环境下采用面向服务的技术进行分布仿真时,网格服务所处环境的变化易使仿真无法继续运行,需要为仿真引入容错机制。因为网格通信传输延迟较大,这使得局域网环境下的容错技术难以满足这一要求。文中针对这一问题将模型设计为自适应的模型服务,并引入一个监测代理。该代理使自适应模型服务有了感知服务器上硬件资源利用率的能力;当利用率达到临界值后,自适应模型服务采取迁移接口执行的访法来调整其服务策略。通过一个基于HLA的仿真实例验证了这种自适应模型服务可以支持对象实例的大量并发访问,使网格环境下的分布仿真运行也能适应环境的变化,具有了一定的容错能力。When service - oriented technologies are used in a simulation in the grid environment, environment changes of grid services may terminate the simulation, so a fault tolerant mechanism must be introduced. Because the transmission latency of grid communication varies from several hundred milliseconds to several seconds, the traditional fault - tolerance methods in a local net cannot meet the above needs. In order to solve this problem, the model - service was designed as an adaptive service and a supervising agent was developed. This agent made the adaptive model -service have the ability to sense the utilization ratio of the hardware resource. When the utilization ratio reached a critical point, the adaptive model - service could adjust its serving policy using an access - migrated method. The simulation experiment based on HLA indicates that this kind of adaptive model - service can support a great deal of object cases to concurrently access it, so that the simulation can adapt environment changes of grid services and has some fault -tolerance ability.

关 键 词：对象实例 监测代理 自适应 感知 迁移 临界值 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]