基于有向无环图的两层网格监测系统

资源监测系统是网格实现中的重要一环，Global Grid Forum已提出用网格监测体系结构（grid monitoring architecture,GMA）来解决这些问题，在此基础上，提出一种基于有向无环图的两层资源监测系统（DTGMS）。该系统使用有向无环图来描述资源间的依赖关系，把它作为该系统的逻辑基础，总体结构分为维护层和工作层同，维护层存储管理监测元数据和控制工作层的运行，工作层依据维护层提供的元数据，负责实际的数据采集、处理、输出等与被监测动态数据直接相关的工作。工作层的监测代理实现为控制核心和扩展模块两部分，有利于实现功能动态扩展。还比较详细地介绍了系统各模块间的交互协议与通信优化。征收GMA相比，新系统更好地满足了网格监测的需求，以较低的系统开销获得较多的功能。

A DAG-BASED TWO-LAYER GRID MONITORING SYSTEM

Resource monitoring systems play important roles in the grid implementations. The Global Grid Forum has presented the grid monitoring architecture (GMA) to solve these problems. Based on the GMA, the DAG-based two-layer grid monitoring system (DTGMS) is introduced, which makes the DAG the logical base of the DTGMS to describe the dependences among monitored resources. The DTGMS consists of maintaining layer and working layer. The maintaining layer manages the metadata and the working layer, while the working layer does the real monitoring work such as gathering, processing and presenting under the control of the maintaining layer. The monitoring agents in the working layer can be divided into control kernel and external modules for dynamic extensions. The interaction protocols among system components and communication optimizations are also covered. Compared with the GMA, the DTGMS satisfies the grid demands better, and provides more functions with lower system consumption.