机群

There is an integrated commercial operating system running on every node computer of a cluster. In order to make the system as a single system providing high performance, high availability services to its users, we must use Single Control Point technology, which is a part of Single System Imager technology.

机群中的每个节点计算机上安装有完整的商业化操作系统，要使这些系统成为一个单一的系统，对用户提供高性能、高可用服务，就必须使用单一控制点技术（单一系统映像SSI技术之一）。

For fault tolerance, to mirror the standalone database server is better than to mirror every computer node in cluster system.

这些计算机结点通过 MPI，PVM等消息传递机制或HPF等数据并行机制，向最终用户提供一个单一的集成的计算资源。针对机群系统，不同的研究机构作了大量

Single Control Point means that the administrator could configure, monitor, test and control the whole cluster and each node computer in it from a single console.

单一控制点是指系统管理员可以从一个单点对整个机群及其各个单独的节点进行配置、监视、测试和控制。

In addition, the effects of parallel efficiency caused by network communication in parallel DFT and traditional one were also compared.

最后，根据理论研究和实际测试的结果，总结了利用PC机群系统进行并行DFT运算的可行性，得出了一些有意义的结论。

So task reallocation is necessary for load balancing.

任务调度是机群系统上实现并行计算需要解决的重要问题之一。

This paper derives from the research and development of control system of intelligent road roller in "863" project.

本文来源于"863"重大专项"基于转运车的机群智能化工程机械及信息化制造"(2003AA430020)中智能压路机控制系统研究开发。

The traditional query tree optimization methods,parallel database optimization methods based on left linear trees and right linear trees,bushy trees,and operation of the forest,have their own pros and cons,they have been more in-depth and maturity of the study.The query optimization method based on multiple weighted tree has studied its model of parallel query plan,its complexity model of parallel query plan and query optimization algorithms.The semantic query method transforms an inquiry into one or several semantic equivalence inquiries then has to find and implement a strategy to achieve a better query.Agent-based parallel database query optimization using Multi-Agent technology to automatically search the integrity constraint conditions which are related to the determined query,there for,the efficiency between several relations' joins has been greatly improved.The parallel optimization algorithm,based on genetic algorithm which is suitable for multi-joins of cluster environment,has deeply studied the relations storage options,multi-joins query optimization and query processing and other key technologies based on cluster parallel database.

传统的查询树优化方法，即基于左线性树、右线性树、浓密树、操作森林的并行数据库查询优化方法，各有优劣，对其的研究比较深入、成熟；基于多重加权树的查询优化方法，研究了其并行查询计划模型、并行查询计划的复杂性模型和查询优化算法；语义查询优化方法将一个查询变换成一个或数个语义等价的查询，进而寻找并执行这些等价查询中具有较好实现策略的一个；基于Agent的并行数据库查询优化采用Multi-Agent技术自动查找与给定查询有关的完整性约束条件，使得多个关系间连接操作的效率得到很大的提高；基于遗传算法的并行优化算法，深入研究了基于机群并行数据库中关系存储的选择、多连接查询优化和查询处理等关键技术。

As soon as enemy bomber formation was sighted, the squadron leader gave the order to peel off.

发现敌人的轰炸机群，中队长立即命令自己的飞机散开。

These works give the guidelines for the implementation of SSI cluster monitoring system.

文中的最后介绍了我们实现的一个单一系统映像机群监控系统：深腾慧眼。

A Web cache-cluster system with higher throughput and hit rate was proposed.

设计并实现一个具有较高吞吐率和命中率的Webcache机群缓存系统。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。