一种基于虚拟化技术的异构网格互操作机制研究与实现

针对目前网格系统在实现机制、技术支持上异构性大,缺乏互操作,提出一种基于虚拟化技术的异构网格互操作机制(Virtualization-based Grid Interoperation,VIGI).VIGI通过构建虚拟管理层和插件模块,实现异构网格互操作,同时保证各网格平台的独立性.GOS、CGSP是中国国家网格(CNGrid)和中国教育科研网格(ChinaGrid)两大异构网格支撑中间件.基于VIGI,实现了CNGrid和ChinaGrid互操作.实验验证虚拟化技术在异构网格互操作中的可行性和有效性.     

中国国家网格作业管理设计与实现

基于中国国家网格（CNGrid）及其系统软件CNGrid GOS,提出并实现了一种VegaBatch网格作业管理系统。VegaBatch通过基于队列长度预测的元调度策略解决了网格作业调度问题;利用双重同步机制维护全局网格作业信息视图;借助用户身份切换机制保障作业数据安全;增加作业重执行功能提供数据后处理能力。对比了国际上较为成熟的网格作业管理软件,讨论了VegaBatch解决的问题。该软件目前已部署在CNGrid环境,提供了功能丰富、安全可靠的网格作业管理功能,降低了CNGrid的使用管理成本,提升了用户体验。     

气象计算网格模式预报系统的建立与优化*

为了在气象部门内跨地域共享使用MM5模式系统,基于建成的气象计算网格平台,成功地接入了MM5模式系统。根据用户预报需求,设计了参数化和业务运行方案,建立了华中区域MM5数值预报应用系统。完成模式系统部署运行后,通过使用网格平台的资源调度和工作流引擎等工具手段,优化了后处理运行流程。运行分析表明网格平台上MM5模式系统的运行效率显著提高。     

信息网格平台工作流程的实现

信息网格系统是利用网格技术实现信息资源的共享、管理和提供信息服务的系统。该文结合信息网格系统在企业信息共享研究和实施工作,分析了基于信息网格平台流程引擎的关键问题,提出了信息网格平台流程的体系结构,并讨论了实现细节,并就实际工程中的使用进行初步评价。     

多网格平台上的高能物理数据共享

当前,高能物理网格计算平台主要依赖于单一的网格中间件与操作系统.而实际上,越来越多的异构资源需要被整合进来.因此,如何在多个平台上(包括不同的网格中间件与操作系统)共享高能物理网格数据是一个基本的研究课题.本文在不改动原有平台的基础上,提出并实现一个网格数据共享系统.基于该系统用户可以透明的在多个平台上管理和共享海量数据.本文主要描述这个系统的体系结构、实现方法、性能优化以及使用场景.     

织女星网格系统平台研究进展(摘录)

<正> 一、织女星网格操作系统关织女星网格操作系统项目由织女星网格系统平台课题组承担,是CNGrid系统软件的重要组成部分。目前,织     

基于OGSA的服务网格应用系统研究与设计

为提高资源的共享能力,在校园网环境下,借助于Globus平台搭建了校园服务网格应用系统.该系统将已有的计算资源和服务,利用网格环境中日臻成熟的中间件技术设计了满足特定需求的服务网格系统构架.提出了基于OGSA-GT3的校园服务网格应用系统的结构CSGA,讨论了CSGA的实现方案和执行流程.在开发的原型系统进行了计算服务的实现,并阐述了服务网格系统今后的研究方向.     

一个高分子模拟计算网格的作业管理

高分子模拟计算网格为复杂材料研究人员提供了分子模拟软件、计算资源和信息共享的平台。设计和实现了网格作业管理模块,包括作业的提交、调度和监视,为用户提供了一个透明的网格资源的使用方法。该模块已经成功部署到高分子模拟计算网格系统中,试验结果表明,作业管理为网格用户提供更好的服务质量,实现了对网格资源的优化使用。     

基于网格服务的电子商务应用研究

针对目前电子商务系统中存在的资源瓶颈问题,结合网格技术的应用背景,提出基于的网格的电子商务系统的应用模型。本文对其产生的原因、该系统的特点,该系统的应用平台、工作流程进行了详细的阐述。目的是实现网格虚拟环境下电子商务管理系统的高性能资源共享和协同工作,消除信息孤岛和资源孤岛,实现管理资源、计算资源、存储资源、数据资源、信息资源、软件资源、网络资源、通信资源、知识资源、专家资源等资源的全面共享,提高工作效率。     

基于网格服务的协同设计平台的设计

为充分利用产品设计合作企业的资源和个体优势,更好地支持企业产品协同设计,从协同设计平台功能需求出发,研究了基于网格服务的协同设计平台的体系结构、资源集成与共享、网格服务实现、网格门户实现等关键技术,构建了基于网格服务的协同设计平台.该平台通过开放网格服务框架,实现了合作企业软件集成和设计资源共享,提高了资源的利用率和产品设计的质量.最后通过机械产品协同设计表明了该平台的有效性.     

Virtual workflow system for distributed collaborative scientific applications on Grids

Grid computing has become an effective computing technique in recent years. This paper develops a virtual workflow system to construct distributed collaborative applications for Grid users. The virtual workflow system consists three levels: abstract workflow system, translator and concrete workflow system. The research highlight of the implementation is that this workflow system is developed based on CORBA and Unicore Grid middleware. Furthermore, this implementation can support legacy application developed with Parco and C++ codes. This virtual workflow system can provide efficient GUI for users to organize distributed scientific collaborative applications and execute them on Grid resources. We present the design, implementation, and evaluation of this virtual workflow system in the paper.     

Resource Space Grid: model,method and platform

A Resource Space Grid is a virtual Grid that aims at effectively sharing, using and managing versatile resources across the Internet. The kernel of the Resource Space Grid includes a Resource Space Model (RSM) and a uniform Resource Using Mechanism (RUM). This paper presents the Resource Space Grid's core scientific issues and methodology, architecture, model and theory, design criteria and method, and practice. A normal form theory is proposed to normalize the resource space—a coordinate system for uniformly specifying and organizing resources. The RUM provides not only the end‐users with an operable resource browser to operate resources using the built‐in Resource Operation Language (ROL), but also the application developers with the ROL‐based programming environment. The prototype platform based on the proposed model and method has been implemented and used for sharing and managing resources in distributed research teams. Operations on Resource Spaces can constitute the virtual communities of Resource Space Grids—a platform independent resource sharing environment. Copyright © 2004 John Wiley & Sons, Ltd.     

水利应用集成门户系统的设计与实现

水利应用集成门户系统作为江苏省水利信息资源整合共享的重要组成部分,旨在解决水利化进程中所面临的各类信息资源孤立问题。通过为用户提供统一的出入口,将江苏省水利厅的各类业务、应用系统、数据资源整合在一起,实现各部门间的信息同步、共享,提高工作效率,避免系统的重复开发。水利应用集成门户系统利用统一用户管理、身份认证、门户内容集成技术,全面梳理整合省厅现有的业务及系统资源,根据个性化定制、内容聚合和后台管理灵活地搭建统一的水利应用集成平台,可高效、直观地展示各部门的应用和信息。     

Design of a grid service-based platform for in silico protein-ligand screenings

Grid computing offers the powerful alternative of sharing resources on a worldwide scale, across different institutions to run computationally intensive, scientific applications without the need for a centralized supercomputer. Much effort has been put into development of software that deploys legacy applications on a grid-based infrastructure and efficiently uses available resources. One field that can benefit greatly from the use of grid resources is that of drug discovery since molecular docking simulations are an integral part of the discovery process. In this paper, we present a scalable, reusable platform to choreograph large virtual screening experiments over a computational grid using the molecular docking simulation software DOCK. Software components are applied on multiple levels to create automated workflows consisting of input data delivery, job scheduling, status query, and collection of output to be displayed in a manageable fashion for further analysis. This was achieved using Opal OP to wrap the DOCK application as a grid service and PERL for data manipulation purposes, alleviating the requirement for extensive knowledge of grid infrastructure. With the platform in place, a screening of the ZINC 2,066,906 compound "drug-like" subset database against an enzyme's catalytic site was successfully performed using the MPI version of DOCK 5.4 on the PRAGMA grid testbed. The screening required 11.56 days laboratory time and utilized 200 processors over 7 clusters.     

GEMLCA: Running Legacy Code Applications as Grid Services

There are many legacy code applications that cannot be run in a Grid environment without significant modification. To avoid re-engineering of legacy code, we developed the Grid Execution Management for Legacy Code Architecture (GEMLCA) that enables deployment of legacy code applications as Grid services. GEMLCA implements a general architecture for deploying legacy applications as Grid services without the need for code re-engineering, or even access to the source files. With GEMLCA, only a user-level understanding is required to run a legacy application from a standard Grid service client. The legacy code runs in its native environment using the GEMLCA resource layer to communicate with the Grid client, thus hiding the legacy nature of the application and presenting it as a Grid service. GEMLCA as a Grid service layer supports submitting jobs, getting their results and status back. The paper introduces the GEMLCA concept, its life cycle, design and implementation. It also presents as an example a legacy simulation code that has been successfully transformed into a Grid service using GEMLCA.     

An improved load-balancing mechanism based on deadline failure recovery on GridSim

Grid computing has emerged a new field, distinguished from conventional distributed computing. It focuses on large-scale resource sharing, innovative applications and in some cases, high performance orientation. The Grid serves as a comprehensive and complete system for organizations by which the maximum utilization of resources is achieved. The load balancing is a process which involves the resource management and an effective load distribution among the resources. Therefore, it is considered to be very important in Grid systems. For a Grid, a dynamic, distributed load balancing scheme provides deadline control for tasks. Due to the condition of deadline failure, developing, deploying, and executing long running applications over the grid remains a challenge. So, deadline failure recovery is an essential factor for Grid computing. In this paper, we propose a dynamic distributed load-balancing technique called “Enhanced GridSim with Load balancing based on Deadline Failure Recovery” (EGDFR) for computational Grids with heterogeneous resources. The proposed algorithm EGDFR is an improved version of the existing EGDC in which we perform load balancing by providing a scheduling system which includes the mechanism of recovery from deadline failure of the Gridlets. Extensive simulation experiments are conducted to quantify the performance of the proposed load-balancing strategy on the GridSim platform. Experiments have shown that the proposed system can considerably improve Grid performance in terms of total execution time, percentage gain in execution time, average response time, resubmitted time and throughput. The proposed load-balancing technique gives 7 % better performance than EGDC in case of constant number of resources, whereas in case of constant number of Gridlets, it gives 11 % better performance than EGDC.     

军事应用网格(MAGrid)体系结构研究

为了适应网络中心战的发展需求,针对传统军事系统的多方面缺陷,文中基于综合集成的思想,采用网格计算技术和Agent技术相结合的方法,提出了一种军事应用网格(MAGrid)构想。它是一种新型综合电子信息系统,文中着重对它的体系结构、总体视图和服务层次进行了具体设计和分析。其中,科学合理的体系结构为具体应用研究提供了平台和基础;从综合集成角度描述的军事应用网格总体视图,体现了该网格的内部构件及其相互关系;服务层次的设计和描述则体现了该应用网格面向服务的本质特征。     

基于GOS的国家网格集成环境及应用实例开发*

中国国家网格作为国内最主要的网格为用户提供了良好的计算服务.详细讨论了网格中间件系统软件GOS的功能和结构,以及基于GOS的中国国家网格集成环境,给出了生物信息软件MEME在国家网格环境下的集成实现,并提出了今后的工作方向.