【摘要】 针对迁移工作流研究现状,提出了一种基于复制容错方法的动态阶段构建模型,模型通过优化迁移实例任务执行,减少对工作位置的不必要重访,缩短迁移实例的执行周期;提出了一种工作位置优先级的计算方法——动态优先级,能够更加准确地反映工作位置作为迁移实例运行时环境的适合程度;还提出了一种阶段工作位置的选取算法,该算法综合考虑工作位置的任务执行能力、运行环境以及可靠性等各个因素。性能分析及仿真试验表明,动态阶段构建模型可以在保证可靠性的同时,有效提高容错执行过程的性能。更多还原

【Abstract】 According to the background of migrating workflow model,a dynamic stage construction model is proposed,which is based on the fault-tolerant protocol.First,the model can dynamically schedule task execution to avoid the unnecessary visit to working place and cut the whole execution period.Second,a dynamic priority method is proposed to evaluate a working place.Finally,the model provides a specific node selection strategy,which combines the task execution ability,running environment and reliability of a working place.Performance analysis and experiments show that the model can simultaneously boost the performance of fault-tolerance and ensure the reliability.更多还原