计算网格中任务管理的若干问题研究-计算机应用专业论文.docx

浙江九学博士学位沦文任务授权是网格基础设旌中的重要挑战。在考虑社区策略的前提下，提出了 浙江九学博士学位沦文 任务授权是网格基础设旌中的重要挑战。在考虑社区策略的前提下，提出了 并行化子任务级授权服务PSAS(a Parallelized Subtask—level Authorization Service) 体系结构以满足权限的最小化原则，同时给出了柔性任务管理和匕下文感知的动 态授权方法。通过解构可并行执行的任务、重新调整访问权限以实现权限的最小 化。通过对资源使用和任务管理设置多值策略和借助上下文代理进行权限集转 换，最终完成了动态授权。基于社区策略，实现了任务管理的社区属性。利用委 托机制完成对任务管理的授权委托。 关键字：计算网格，任务管理，任务调度，网格不确定性，服务质量操纵 负载平衡，容错，任务授权，管理委托 TI 塑坚盔堂苎主兰垡丝塞Abstract 塑坚盔堂苎主兰垡丝塞 Abstract A computational grid is an emerging computing infrastructure that enables effective C00rdinate access to various distributed computing resources in order to serve the needs of VOs(Virtual Organizations)．It is significant and valuable for both researchers and engineers to investigate grid-computing technologies for engineering and scientific computation to support collaboration across different administrative domaias．However，grid performance that can be delivered varies dynamically due to resources competing，task uncertainty，and so on．Therefore，resource scheduling and task management are key issues．In grid environments，from task submission to result processing．all events about tasks are under the control of task management．Because grid environments are large·scale，heterogeneous，dynamic，distributed and autonomous，grid task management is complex and challenging．In this dissertation， based on the application background of engineering and scientific computMion applications，we foGaS on several issues of task management in computational grids． All the related reach activities are suppoaed by the Natioual Natural Science Foundation of China under Grant Noand the National High—Tech．RD 863 Program ofChina underGrantNo．2002AA414070． The proposed system of task mann∞ment is a part of the MASSlVE ( Multidisciplinary ApplicationS-oriented Simulation and Visualization Environment)project。which aims to use Grid technology to establish an enabling environment for distributed simulation and visualization of large-scale scientific and engineering research．In this task ma