首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 46 毫秒
1.
分布式和并行系统的负载平衡是影响系统性能的一个重要因素,本文提出了一个基于预测的动态负载平衡算法,本算法以本地负载信息为基础预测该结点达到空闲状态的时间,并且在该结点到达空闲状态之前发出任务请求,从而保证系统中各结点都处于忙碌状态,提高系统资源的利用率,提高系统性能。  相似文献   

2.
基于集群的负载平衡调度算法研究与实现   总被引:4,自引:1,他引:4  
在集群系统的负载调度研究中,针对请求的服务时间变化大的特点,该文提出了一个动态反馈负载平衡算法,它结合内核中的加权连接调度算法,根据动态反馈回来的负载信息来调整服务器的权值,从而有效地解决服务器问的负载不平衡问题,提高了系统的吞吐率。  相似文献   

3.
针对现有服务器集群的负载平衡算法不足,提出一种应用层自适应动态负载平衡算法。利用应用层特点,在负载均衡服务器端收集应用服务器负载信息,提出一种综合的权重计算方法,动态区分不同状态的服务器。通过自适应选择算法,合理分配请求至应用服务器。实验结果表明,在不同的负载情况下,该算法能有效地平衡负载,充分利用服务器资源。  相似文献   

4.
对于具有海量信息的数字图书馆,文章针对不同请求服务时间变化大的特性,提出基于请求类型的负载平衡模型,该模型根据各种不同请求对服务器负载状况的影响并结合各服务器的性能进行动态负载调度。避免占用服务器资源较多的请求同时分配到同一台服务器上。仿真结果表明该模型具有良好的负载平衡效果。有效地缩短了用户请求的响应时间。  相似文献   

5.
基于退火算法的动态负载均衡研究   总被引:1,自引:0,他引:1  
分析现有服务器集群的动态负载平衡算法的特点和劣势,结合模拟退火算法和动态加权轮询算法的优势,提出一种动态负载平衡模型和解决方法。该模型使用模拟退火算法,自适应并且精确地确定性能权重向量,利用动态加权轮询算法,实时计算应用服务器负载,动态分配请求。通过该方法可以获得更合理的性能权重向量,有效地分配服务器负载,充分地利用服务器计算能力。实验结果表明,在负载逐渐提高的情况下,该算法保持了良好的平均响应时间和吞吐量,并且优于对比算法。  相似文献   

6.
在基于并行构件的系统中,负载平衡技术是充分利用系统资源,提高系统性能的关键技术。该文提出了一种基于并行构件的动态负载池平衡技术,与已有的负载平衡策略不同,该技术综合考虑了通信延迟、容错技术以及数据一致性对负载平衡策略的影响,旨在提高策略的准确性、高效性和健壮性,增强运行时系统的性能。  相似文献   

7.
集群系统中自适应负载反馈平衡策略的研究   总被引:2,自引:0,他引:2  
当前在集群系统中,负载平衡策略虽然很多,但是为了减少反馈开销,一般策略为采用在前端估计后端负载,所以不能很好地完成负载平衡的任务。针对这一问题,提出了一种自适应负载反馈平衡策略,各个服务器根据自身负载的变化来决定负载反馈的时机,前端根据负载信息和请求率计算出各个服务器的负载权值,最后根据负载权值来调度服务器处理请求,以实现负载平衡。由于采用了自适应的反馈策略,在获得各个服务器负载信息的同时减少了负载反馈的开销,实现了系统的负载均衡。测试结果表明该策略表现出了一定的优势。  相似文献   

8.
集群动态负载平衡系统的性能评价   总被引:18,自引:0,他引:18  
唐丹  金海  张永坤 《计算机学报》2004,27(6):803-811
该文使用随机Petri网对集群动态负载平衡系统建立了一个抽象模型.通过细化模型中的节点本地处理部分对5种动态负载平衡算法的性能进行了分析,并讨论了集群负载特性对动态负载平衡系统性能的影响,最后得出的主要结论有:(1)动态负载平衡算法可以取得比静态负载平衡算法更好的性能;(2)与传统的只考虑CPU就绪队列的负载平衡算法相比,考虑了各种I/O请求队列的负载平衡算法可以取得更好的性能;(3)即使在极端的集群负载特性中。集群动态负载平衡算法仍然能取得比较理想的性能,因此实现即使是十分简单的集群动态负载平衡系统也是很有必要的。  相似文献   

9.
基于M/M/1模型的多用户分布式系统负载平衡   总被引:1,自引:0,他引:1       下载免费PDF全文
陈国栋  陈永生 《计算机工程》2008,34(23):125-127
针对分布式系统负载平衡问题,对动态全局最优策略进行改进,结合静态全局最优策略,提出动静结合的负载平衡策略。策略克服在较高通信开销时动态负载平衡策略的缺点,有效提高分布式系统的综合性能。仿真结果表明,使用该策略在通信开销较高和系统负载率大于40%的情况下,能够获得比动态负载平衡更小的系统预期响应时间。  相似文献   

10.
马慧  陶少华 《计算机工程》2010,36(12):277-278
数字图书馆会出现用户请求响应时间较长、服务器资源消耗较大以及集群环境中各服务器性能不同导致的网络负载不平衡问题。为解决上述问题,提出基于服务类型的负载平衡中间件模型。该模型考虑不同的服务请求对服务器负载状况的影响,结合各服务器的性能进行动态负载调度。性能测试结果表明,该中间件负载平衡效果良好,可用性与可靠性较高。  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   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号