共查询到18条相似文献,搜索用时 187 毫秒
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一个具有服务质量保障的面向服务的网格模型 总被引:1,自引:0,他引:1
为了在面向服务的网格系统中提供服务质量(QoS)支持,本文较深入地研究了OGSA及Web Service等相关理论和技术.基于面向服务的体系结构,提出了一个具有QoS保障的面向服务的网格系统模型SoGSM—QoS.该模型通过物理网格节点的联合,来消除管理上的冗余并简化网格系统结构.模型支持虚拟组织和资源虚拟化,在各层次间提供用户QoS需求的映射和监控,保障用户的QoS.本文详细阐述了模型的结构、功能和访问控制机制,并建立了相应的过程模型.分析了有关性能,验证了模型的有效性. 相似文献
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一种基于QoS的网格服务选择机制 总被引:1,自引:0,他引:1
开放网格服务体系结构OGSA提出了网格服务的概念,为网格资源的虚拟化管理给出了一条有效途径。当前网格系统对于网格服务的支持主要集中在服务的功能发现与调用部分,缺乏对服务的非功能属性的管理支持。服务的非功能属性如服务的响应时间、价格、可靠性等对于用户来说非常重要,体现着用户对网格服务的QoS需求。基于QoS的服务选择机制能够对网格服务的QoS模型进行管理和度量,对于用户提出的QoS需求,服务匹配算法能够为用户选择满足需求倾向的服务。 相似文献
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开放网格服务体系结构(OGSA)的出现使得原来的网格资源管理模式不能够满足要求,通过对于目前网格服务管理体系架构的三种模式进行分析,确定了网格服务管理系统的功能需求,提出了一种基于开放式服务体系架构的网格服务管理模型,为了区分用户对于服务质量要求的不同,引入了服务级别概念,保证了用户的服务质量(QoS)需求,最后构造了电子政务的网格服务管理原形系统。 相似文献
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中国国家网格(China National Grid,CNGrid)是聚合了高性能计算和事务处理能力的新一代信息基础设施的试验床。中国国家网格武汉结点高性能集群系统采用支持资源预留的开源集群管理器OAR,为用户提供具有服务质量保障的高性能计算服务。GOS(Grid Operating System)是CNGrid网格中间件,CNGrideye是CNGrid监控系统。设计了CNGrideye/OAR监控桥接和GOS-HPCG/OAR作业管理桥接机制,使得CNGrideye支持对OAR的监控,GOSHPCG能通过OAR提交作业,充分利用OAR的资源预留等特性。GOS-HPCG/OAR进行基于QoS的作业调度,提高了作业的运行效率和资源的服务性能,达到整合资源的目的。 相似文献
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为了充分整合分布的高性能计算资源,本文提出一种面向科学计算的网格环境,旨在形成一个可统一管理和运行维护的虚拟的超级计算机资源,面向用户提供统一、易用、可靠的科学计算服务。面向科学计算的网格环境通过轻量级网格中间件SCE汇聚资源,支持作业的全局调度、数据的统一管理视图,面向用户提供命令行和网格门户两种使用方式,并提供编程接口供专业社区和学科平台二次开发使用,满足不同层次的用户需求。目前,面向科学计算的网格环境已经在中国科学院超级计算环境(ScGrid)中得到应用和用户认可。 相似文献
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This paper presents a cross-layer quality of service (QoS) optimization policy for computational grid. Efficient QoS management is critical for computational grid to meet heterogeneity and dynamics of resources and users’ requirements. There are different QoS metrics at different layers of computational grid. To improve perceived QoS by end users over computational grid, QoS supports can be addressed in different layers, including application layer, collective layer, fabric layer and so forth. The paper tackles cross-layer grid QoS optimization as optimization decomposition, each layer corresponds to a decomposed subproblem. The proposed policy produces an optimal set of grid resources, service compositions and user's payments at the fabric layer, collective layer and application layer respectively to maximize global grid QoS. The cross-layer optimization problem decomposes into three subproblems: grid resource allocation problem, service composing and user satisfaction degree maximization problem, all of which interact through the optimal variables for capacities of grid resources and service demand. In order to coordinate the subproblems, cross-layer QoS feedback mechanism is established to ensure different layer interactions. The simulations are conducted to validate the efficiency of the proposed policy. 相似文献
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随着网格服务应用的发展,在网格工作流中,复杂的任务可以由多个独立的服务,通过工作流引擎等方式组合成新服务后完成。在组合服务的过程中,由不同服务提供商提供的候选服务,具有不同的服务质量参数,在网格工作流调度中,需要满足用户定义的服务质量约束。提出了方便用户定义的服务质量模型,并且在该模型的基础上,改进了网格工作流调度算法,通过实验分析证明改进后的算法优于传统的调度算法。 相似文献
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研究服务网格中的服务质量(QoS)保障问题.定义基本QoS参数及量化要求,阐述QoS参数归一计算方法,提出一种基于整体QoS的服务匹配策略.该策略利用QoS约束的一致性和整体QoS特性进行网格服务发现与选择,从而减小满足最小服务要求的解空间.实验结果表明该策略有效提高了匹配服务的执行效率,满足了用户的QoS需求. 相似文献
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Service composition enables users to realize their complex needs as a single request and it has been recognized as a flexible
way for resource sharing and application integration since the appearance of Service-Oriented Architecture (SOA). For each
of the needed individual services there may be many candidate services available presented by different vendors and with different
functional and non-functional properties such as Quality of Service (QoS). Approaches are needed to select candidate services
with various QoS levels according to user’s performance requirements meanwhile adapt to dynamic churn in grid environments.
This paper mainly focuses on adaptive management of QoS-aware service composition in grid environments and proposes an adaptive
algorithm for QoS-aware service composition (AQSC). In AQSC we model this problem as the Multi-Constrained Optimal Path selection
problem (MCOP) and use heuristic approach for service selection, then backup services set is introduced as an adaptive mechanism
so as to ensure the fulfillment of composite service when some candidate services fail or withdraw. Both theoretical analysis
and simulation results indicate that AQSC has high composition success rate, finish rate and low cost. 相似文献
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网格市场环境下,用户的服务质量(QoS)需求更加多样化;更多普通用户加入网格市场,难以提供精确的QoS需求信息.因此,基于用户模糊QoS需求的调度算法成为网格市场中研究的热点.多维QoS网格调度的形式化描述,利用模糊决策理论有效地将用户模糊的QoS需求的映射到网格资源,利用AHP算法确定用户关于多维QoS各维度之间的权重关系,给出一种模糊决策的多维QoS的调度方法.实验表明,模糊决策的多维QoS批调度算法在不需要用户提供精确的QoS参数前提下,有效满足用户QoS需求.与现有的QoS批调度方法相比,该算法具有较好的一次作业完成率,且作业完成率波动较小. 相似文献
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Thamarai Selvi Somasundaram Kannan Govindarajan Usha Kiruthika Rajkumar Buyya 《The Journal of supercomputing》2014,68(2):509-556
Grid computing is mainly helpful for executing high-performance computing applications. However, conventional grid resources sometimes fail to offer a dynamic application execution environment and this increases the rate at which the job requests of users are rejected. Integrating emerging virtualization technologies in grid and cloud computing facilitates the provision of dynamic virtual resources in the required execution environment. Resource brokers play a significant role in managing grid and cloud resources as well as identifying potential resources that satisfy users’ application requests. This research paper proposes a semantic-enabled CARE Resource Broker (SeCRB) that provides a common framework to describe grid and cloud resources, and to discover them in an intelligent manner by considering software, hardware and quality of service (QoS) requirements. The proposed semantic resource discovery mechanism classifies the resources into three categories viz., exact, high-similarity subsume and high-similarity plug-in regions. To achieve the necessary user QoS requirements, we have included a service level agreement (SLA) negotiation mechanism that pairs users’ QoS requirements with matching resources to guarantee the execution of applications, and to achieve the desired QoS of users. Finally, we have implemented the QoS-based resource scheduling mechanism that selects the resources from the SLA negotiation accepted list in an optimal manner. The proposed work is simulated and evaluated by submitting real-world bio-informatics and image processing application for various test cases. The result of the experiment shows that for jobs submitted to the resource broker, job rejection rate is reduced while job success and scheduling rates are increased, thus making the resource management system more efficient. 相似文献