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1.
一种统一的资源预留策略   总被引:4,自引:0,他引:4  
资源预留可以保证任务在开始执行时获得资源,而这在网格这样资源动态性很强的环境中是很可贵的,因而资源预留是网格任务调度中一种普遍采用的策略。当前资源预留的研究主要集中在计算资源预留的情况,文中提出了一个网格环境中资源预留的统一策略,该策略对其它资源的预留和计算资源的预留一起加以考虑,经过模拟验证,该策略能够很好地和我们先前设计的一种基于资源预留的任务映射算法结合起来,适用于网格的动态、异构性环境。  相似文献   

2.
网格环境下基于QoS的资源映射策略   总被引:1,自引:0,他引:1       下载免费PDF全文
资源映射是网格计算研究领域中的一个研究热点。现有的研究工作通常考虑任务的完成时间,对于满足用户QoS需求前提下提高资源映射性能方面还缺乏深入的研究。该文提出一种网格环境下相互独立任务的基于QoS的资源映射策略——QSPCR_Sufferage。综合考虑了任务的截止期属性和多QoS参数,选择最优资源。实验结果表明,该策略可以在满足用户多QoS需求下,有效地提高任务请求成功率和资源利用率。  相似文献   

3.
网格计算环境下,基于有向无环图(DAG)的成本-时间优化调度算法运用经济规律把网格用户的任务映射到网格资源中运行.OGS算法考虑了任务间的优先关系,使得任务完成时间最小,但没考虑到在网格环境中所需的成本.Nimrod/G模型中提出基于时间和成本限制下的优化调度算法(DBC)考虑了时间和成本,但没考虑任务问的优先关系.本文综合考虑了成本-时间因素以及任务间的优先关系,在不增加完成时间的基础上,把任务映射到价格便宜的机器上,提出了基于有向无环图的成本-时间优化调度算法.通过仿真表明,相对OGS算法,该算法减少了所需成本.  相似文献   

4.
针对网格领域中资源花费的问题,在分层结构的基础上提出了一种基于综合指数法的网格资源发现及准入策略.该策略描述了一种分层的网格系统结构模型,提高了网格环境下资源发现的效率,并能够综合考虑网格任务执行费用和执行时间两种因素,利用综合指数法对主动声明加入网格的资源状态进行多属性综合评价.在顺利进行资源发现的前提下,针对需要控制花费的网格任务,建立相适应的子网格,使任务计算花费和性能得到最优化.最后,搭建模拟环境表明了该算法的可行性和有效性.  相似文献   

5.
一种基于序贯博弈的网格资源分配策略   总被引:16,自引:1,他引:16  
李志洁  程春田  黄飞雪  李欣 《软件学报》2006,17(11):2373-2383
网格环境中资源的负载预测是实现资源优化分配的关键任务之一,而网格资源的动态性和异构性使得准确判断资源的负载状态十分困难.针对已有的分配策略对资源负载评估的不足,提出了一种基于序贯博弈的优化用户时间的网格资源分配策略.该策略将正比例资源共享的网格环境中多用户竞争同一计算资源的问题形式化为一个多人序贯博弈,通过寻求该序贯博弈中各个阶段博弈的纳什均衡解来预测资源负载;然后利用此负载信息生成所有用户的最优出价组合和资源的优化价格;最后根据各用户出价,按比例分配资源的计算能力.通过对网格模拟器GridSim的实验研究,结果表明,该策略能够得到合理的用户出价,降低资源占用时间,从而弥补了Bredin提出的优化策略中未考虑资源未来负载变化的缺陷,实现了资源的优化分配.其结论说明运用序贯博弈方法预测资源负载是可行的,且能更好地适应网格环境下异构资源的动态性.  相似文献   

6.
张伟  秦臻  苑迎春 《计算机工程》2006,32(16):97-99
开放网格服务架构(OGSA)和计算经济模型的提出,使得动态的、不同QoS的服务支持下的资源调度成为一个复杂且具有挑战性的问题。该文提出了网格环境下基于费用-时间的工作流调度算法,该算法采用动态资源选择策略适应网格计算环境下的动态性和自治性。在追求较小的工作流完成时间的同时,对费用进行了优化。模拟结果显示该调度算法符合计算网格的复杂环境,能够更好地满足不同用户的实际需要。  相似文献   

7.
网格优化有向超图任务调度算法   总被引:1,自引:0,他引:1  
任务调度是网格计算的一个重要部分.分析网格环境下任务调度的特点以及传统DAG图的优缺点,吸取有向超图的优点,将有向超图理论融合网格环境特征,建立了网格环境下的优化有向超图模型,并在此基础上通过网格优化有向超图的水平构形、标号及带宽计算实现任务对网格资源的映射与调度,提出网格优化有向超图任务调度算法GODHTS.模拟实验结果证明了该模型及其算法的有效性和优越性.  相似文献   

8.
网格计算中任务调度算法的研究和改进   总被引:2,自引:0,他引:2  
任务调度一直是网格计算中的热点问题,任务调度的目的是最优地分配任务,实现最佳的调度策略,以高效地完成计算任务。在网格环境中,资源的合理有效利用是实现任务调度的关键问题之一。本文首先论述静态任务调度算法和动态任务算法的原理和优缺点等,然后结合Min-min、Max-min算法的优点设计一种新的调度算法SA-MM,根据资源的使用情况自适应调度相应算法进行任务到资源的映射。最后,用GridSim模拟工具对网格计算中Min-min、Max-min和SA-MM任务调度算法进行仿真实验,分析和比较它们的调度长度(MakeSpan)和资源负载情况等影响任务调度效率的指标。  相似文献   

9.
网格计算环境下资源联合分配的映射策略与机制   总被引:4,自引:0,他引:4  
刘丽  杨扬  田志民 《计算机工程》2005,31(16):130-131,149
提出用于网格环境的资源协同调度框架及网格环境下多任务的资源映射策略,用图论中有向无环图解决资源调度过程中任务的优先级限制问题,并在有向无环图上构造兼容图,通过寻找图中最大独立任务集的方法,解决多任务对多资源请求的资源共享问题。给出了网格计算环境下动态资源联合分配的资源管理机制。  相似文献   

10.
服务资源分配和调度在开放网格服务架构环境中是一个复杂且具有挑战性的问题.为适应网格计算环境下服务资源的动态性和自治性,提出一个基于扩展关键活动的工作流调度算法,采用动态选择所需服务资源的策略,工作流完成时间和所需成本得到一定程度的平衡.实验结果表明该调度算法在完成时间、成本等方面可得到较满意的结果,能更好地满足用户实际需要.  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.  相似文献   

13.
融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
《计算机科学》2007,34(4):148-148
Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.  相似文献   

18.
Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.  相似文献   

19.
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.  相似文献   

20.
This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)SM and Team Software Process (TSP){SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.  相似文献   

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