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1.
胡师彦 《湖南城市学院学报》2001,18(6):57-60
介绍了并行计算的基本概念,利用局域网和PVM构成并行计算环境,实现了对电荷量变化的并行计算.改进了传统的隐式龙格库塔方法,在实际计算中取得良好效果.最后讨论了与并行计算效率有关的因素. 相似文献
2.
针对基于内容的图像检索技术存在的问题,结合多维空间仿生信息学（Multi-Dimensional SpaceBiomimetic Informatics,MDSBI）理论和可并行计算原理,根据在多维空间中分析图像的同源连续性规律和GPU工作的特点,提取一种可并行计算的图像特征提取算法和检索技术.实验比较证明,该方法在解决检索效率和检索速度有很大的提高. 相似文献
3.
杨文有 《淮南师范学院学报》2010,12(3):36-37
在拥有不同计算能力的异构机群中,并行计算任务调度问题是一个NP-完全问题,现有的任务分配处理方法中．对机群任务分配与监控处理以及对机群节点计算能力和负载方面考虑较少,在实际计算中可能严重影响机群性能,降低计算效率,而在MPT中引入动态负载均衡的办法能够提高任务分配质量和计算节点工作效率,实验结果表明动态负载均衡模型能够很好地解决任务调度的问题。 相似文献
4.
现代经济学研究的最新特征对经济研究中所使用的计算方法与速度提出了更高的要求,并行计算方法的引入成功地解决了许多传统PC难以解决的运算问题.介绍了并行计算在经济学研究中的作用,并结合国外研究型大学经济学实验室并行计算集群建设的经验,提出在我国研究型大学经济学实验室中建设高性能计算集群的必要性与可行性.最后,结合实际建设经验提出建设方案及使用效果评价. 相似文献
5.
在P2P流媒体系统中,一个高效实用的资源索引及传输机制能很好地均衡系统的负载,加强系统的稳定性,并减少节点的搜索时延.在实际的应用中,不同服务能力的节点对于整个网络的不同贡献应该得到不同的激励.本文提出一种具有商业激励的P2P流媒体系统资源索引及传输机制.文章在对节点进行空间划分的基础上,对现有的节点良好度评价标准,节点排序算法做出了改进,并在相应的商业激励值下进行数据的传输.该机制加快了资源的搜索速度,均衡了系统负载并提高了用户上传的积极性,对于现有P2P流媒体系统的改进具有积极的意义. 相似文献
6.
7.
针对并行计算网格中资源管理和分配的特点,主要利用蚁群算法在求解组合问题中的优越性来解决网格中资源分配问题。通过对蚁群算法原理的分析和深入探讨,设计了基于蚁群算法的网格资源分配模型和算法。 相似文献
8.
在本文中，我们介绍了一种基于遗传算法的指纹方向图划分方案.根据各种典型指纹类别的拓扑特性而引进了一组动态分区
模板和代价函数用于引导方向图分区，并将寻找最佳匹配划分的过程转化成一个N维向量空间的函数优化问题，然后给出了该问题
基于遗传算法的求解过程.最后，我们讨论了本方法在指纹分类中的应用. 相似文献
9.
高潮 《深圳信息职业技术学院学报》2007,5(4):19-23
由于微处理器CPU电压的降低以及负载电流和负载电流变化率的增加，系统容量就会急剧增加以处理高di／dt的负载变化，如果使用常规VR技术（开关电压调节器VR），由于导线的寄生参数的存在，通过添加更多的电容器，效果并不显著。在本文中，我们提出一个新的配置和控制概念，以解决电压尖峰问题。改进的VR将在0.2us内响应，以避免电压尖峰陡升或陡降太多。这一概念的提出将使目前的VR跟上微处理器的发展。利用所提出的动态补偿可以解决这些问题，减少电容值，以降低成本、节省系统主板的空间和减少寄生参数对其的影响，打破阻碍下一代英特尔CPU的开发和应用的高变化率（di／dt）的势垒．在系统级上大幅度降低成本，节省主机板空间。 相似文献
10.
介绍了并行计算的基本概念，利用局域网和PVM构成并行计算环境，实现了对电荷量变化的并行计算，改进了传统的隐式龙格库塔方法，在实际计算中取得良好效果，最后讨论了与并行计算效率有关的因素。 相似文献
11.
Dynamic distribution model is one of the best schemes for parallel volume rendering. However, in homogeneous cluster system, since the granularity is traditionally identical, all processors communicate almost simultaneously and computation load may lose balance. Due to problems above, a dynamic distribution model with prime granularity for parallel computing is presented. Granularities of each processor are relatively prime, and related theories are introduced, A high parallel performance can be achieved by minimizing network competition and using a load balancing strategy that ensures all processors finish almost simultaneously, Based on Master-Slave-Gleaner （ MSG） scheme, the parallel Splatting Algorithm for volume rendering is used to test the model on IBM Cluster 1350 system. The experimental results show that the model can bring a considerable improvement in performance, including computation efficiency, total execution time, speed, and load balancing. 相似文献
12.
An adaptive load balancing scheme is proposed to balance the load in ad hoc networks. The new scheme can be applied in most on-demand routing protocols resulting in significant performance improvement. The proposed scheme is applied to the ad hoc on-demand distance vector (AODV) routing protocol. Simulation results show that the network load is balanced on the whole, and performance in packet loss rate, routing overhead and average end-to-end delay is also improved. 相似文献
13.
Parallel machine scheduling problems, which are important discrete optimization problems, may occur in many applications. For example, load balancing in network communication channel assignment, parallel processing in large-size computing, task arrangement in flexible manufacturing systems, etc., are multiprocessor scheduling problem. In the traditional parallel machine scheduling problems, it is assumed that the problems are considered in offline or online environment. But in practice, problems are often not really offline or online but somehow in-between. This means that, with respect to the online problem, some further information about the tasks is available, which allows the improvement of the performance of the best possible algorithms. Problems of this class are called semi-online ones. In this paper, the semi-online problem P2|decr|lp (p＞1) is considered where jobs come in non-increasing order of their processing times and the objective is to minimize the sum of the lp norm of every machine's load. It is shown that LS algorithm is optimal for any lp norm, which extends the results known in the literature. Furthermore, randomized lower bounds for the problems P2|online|lp and P2|decr|lp are presented. 相似文献
14.
As a parallel programming model, Map-Reduce is used for distributed computing of massive data. Map-Reduce model encapsulates
the details of parallel implementation, fault-tolerant processing, local computing and load balancing, etc., provides a simple but powerful interface. In case of having no clear idea about distributed and parallel programming, this
interface can be utilized to save development time. This paper introduces the method of using Hadoop, the open-source Map-Reduce
software platform, to combine PCs to carry out scalable parallel computing. Our experiment using 12 PCs to compute N-body problem based on Map-Reduce model shows that we can get a 9.8x speedup ratio. This work indicates that the Map-Reduce can be applied in scalable parallel computing. 相似文献
15.
云计算通过互联网提供随需应变的资源或服务,通常依据数据中心的规模和可靠性水平而定。MapReduce是一个为并行处理大量数据设计的编程模型,在云环境中实现HadoopMapReduce框架,使用虚拟的负载平衡来改进单节点和多节点系统的性能。 相似文献
16.
An improved method is derived for estimating conditional measurement error variances, that is, error variances specific to individual examinees or specific to each point on the raw score scale of the test. The method involves partitioning the test into short parallel parts, computing for each examinee the unbiased estimate of the variance of part-test scores, and multiplying this variance by a constant dictated by classical test theory. Empirical data are used to corroborate the principal theoretical deductions. 相似文献
17.
电子通信信息是当代社会运行的重要信息组成之一,提高电子通信信息存储能力对于各行业高效率处理事务意义重大。基于Hadoop集群环境设计了单节点双层Hadoop结构,分担主节点存储信息的压力;构建MapReduce信息并行计算模型分担海量存储任务,基于动态优先级负载均衡调度算法均衡存储节点的负载量,避免个别或者少数节点负担过重,延长Hadoop存储系统节点的使用寿命。测试结果显示,该方法有效均衡了海量信息存储时间,存储大规模电子通信数据的耗时较少。 相似文献
18.
为了解决电力工业中并行数据流范围聚集的连续查询问题,提出一种新颖的数据流划分方法.首先构造了一个适用于数据流处理的扩展蓄水池抽样算法,根据流值变化率引入跳跃因子反应负荷数据的变化情况,实现数据流的自适应并行采样.然后为了实现数据流量的平均划分,基于近似技术提出2种适应不同情况的生成等深柱状图的算法:增量更新的启发式方法和周期性更新的快捷方法,从而在采样的基础上生成近似划分向量.通过在实际数据集上对算法性能测试,证明文中提出的数据流划分方法高效实用,适合于高速时变数据流的处理. 相似文献
19.
CORBA为异构环境下的应用对象之间的交互提供了一个有效的交互和通讯平台，简化了应用系统的开发．典型的CORBA应用由多个对象组成，这些对象可能分布在不同的主机上，因此平衡系统负载将是改善和提高应用系统整体性的关键．分析讨论了已有的关于CORBA环境下的负载平衡策略存在的主要问题后，提出一个新的CORBA环境下的分布式动态负载平衡模型，实现了基于最短总体期望响应时间策略的负载平衡系统． 相似文献
20.
Parallel machine scheduling problems, which are important discrete optimization problems, may occur in many applications.
For example, load balancing in network communication channel assignment, parallel processing in large-size computing, task
arrangement in flexible manufacturing systems, etc., are multiprocessor scheduling problem. In the traditional parallel machine
scheduling problems, it is assumed that the problems are considered in offline or online environment. But in practice, problems
are often not really offline or online but somehow in-between. This means that, with respect to the online problem, some further
information about the tasks is available, which allows the improvement of the performance of the best possible algorithms.
Problems of this class are called semi-online ones. In this paper, the semi-online problemP2|decr|l
p (p>1) is considered where jobs come in non-increasing order of their processing times and the objective is to minimize the sum
of thel
p norm of every machine's load. It is shown thatLS algorithm is optimal for anyl
p norm, which extends the results known in the literature. Furthermore, randomized lower bounds for the problemsP2|online|l
p andP2|decr|l
p are presented.
Project supported by the National Natural Science Foundation of China (Nos. 10271110, 10301028) and the Teaching and Research
Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE, China 相似文献