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李学昌 《数字社区&智能家居》2005,(6):32-33
Windows不能启动了,密码忘记了,文件被误删了,分区出错了,咋办?过去我也认为难办。可现在就不同了,笔者可以很自信地告诉各位朋友,这很好办。从光盘启动WindowsXP,进去后,你想咋办就唯办。 相似文献
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现在的摄像头便宜了,身边的朋友几乎都人手一个的,晚上上QQ的时候,大家都双双开视频,还真够热闹了。可是过了一阵子以后,新鲜感过去了,大家都比较情愿把网络的带宽用在下载上了,摄像头用的机会就少了,甚至干脆就卸下来放到抽屉去了。慢慢的,系统新装和删除的东西都多了,已经安装的驱动程序相信早就删去了,而附带的驱动程序光盘,也早就不知道丢哪里去了,当某天忽然又想起这个几乎要被遗忘的摄像头时,重新使用之前,还真的免不了要为驱动程序而发愁。 相似文献
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2004年5月1日,带着中国电信集团领导的嘱托,起程前往美国进行为期三个星期的学习和考察。我们先在美国著名的斯坦福大学商学院学习了工商管理课程,然后对美国的SPRINT公司、MCI公司和中国电信美国公司进行了访问和考察。这次学习让我们开阔了眼界,增长了知识,交流了经验,建立了友谊。在结业典礼上,教授们高度评价我们班.认为学员学习认真,善于思考,提出问题有深度和高度。这次学习中,教授层次高、阵容强,既有扎实的理论功底,又有丰富的实践基础,具有全球化的视野和深入浅出、幽默的讲解,使我们拓宽了思路,丰富了才干,理清了方向.调整了思维方式,对集团的战略决策有了更深的理解,深深感到了历史的责任和使命。 相似文献
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朱远喜 《数字社区&智能家居》2004,(12):11-11
受小妹之命,为她噪音巨大的机器做了一次“保健”。开机,按常规优化了一番系统,发现无多大改善。再听听噪音.是硬盘的声响,哈哈,胸有成竹了,肯定是磁盘碎片过多,该整理了。于是,我告诉小妹,用Diskeeper吧。 相似文献
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1.引言程序的调试技术对于计算来说是很重要的,因为抛开性能不谈,程序的正确性是编程者追求的最终目标。然而随着科学的发展,需要解决的问题的规模越来越大,传统的串行计算模式已经难以满足需要,于是并行计算模式被提出。那么调试这一必需的功能也要被放到并行计算环境中重新考虑,从而提出了并行调试的概念。 相似文献
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国内并联机器人研究现状及未来进展 总被引:4,自引:0,他引:4
根据大量国内并联机器人文献,介绍了国内并联机器人的机构学、运动学、动力学、控制策略以及仿真等方面的主要研究成果,并阐述了我国并联机器人未来发展的方向以及尚待解决的问题。 相似文献
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Parallel computing with the MATLAB® language and environment has received interest from various quarters. The Parallel Computing ToolboxTM and MATLAB® Distributed Computing ServerTM from The MathWorks are among several available tools that offer this capability. We explore some of the key features of the parallel MATLAB language that these tools offer. We describe the underlying mechanics as well as the salient design decisions and rationale for certain features in the toolset. The paper concludes by identifying some issues that we must address as the language features evolve. 相似文献
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Lukasz G. Szafaryn Todd Gamblin Bronis R. de Supinski Kevin Skadron 《Journal of Parallel and Distributed Computing》2013
The increasing computational needs of parallel applications inevitably require portability across parallel architectures, which now include heterogeneous processing resources, such as CPUs and GPUs, and multiple SIMD/SIMT widths. However, the lack of a common parallel programming paradigm that provides predictable, near-optimal performance on each resource leads to the use of low-level frameworks with architecture-specific optimizations, which in turn cause the code base to diverge and makes porting difficult. Our experiences with parallel applications and frameworks lead us to the conclusion that achieving performance portability requires a common set of high-level directives and efficient mapping onto each architecture. 相似文献
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串行程序在大粒度级的并行分解及可并行执行包的形成 总被引:1,自引:0,他引:1
本文提出了针对由划分阶段所形成的任务图[7]进行优化、合并的技术及相应的算法,用于在并行与通信开销间进行折衷,以使分解出的并行成份有尽可能高的执行效率。本文还给出了根据综合后的任务图形成可并行执行包,并在其中自动插入通信原语的方法。 相似文献
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Parallel Algorithm Oriented Mesh Database 总被引:1,自引:1,他引:0
Jean-François Remacle Ottmar Klaas Joseph E. Flaherty Mark S. Shephard 《Engineering with Computers》2002,18(3):274-284
In this paper, we present a new point of view for efficiently managing general parallel mesh representations. Taking as a
slarting point the Algorithm Oriented Mesh Database (AOMD) of [1] we extend the concepts to a parallel mesh representation.
The important aspects of parallel adaptivity and dynamic load balancing are discussed. We finally show how AOMD can be effectively
interfaced with mesh adaptive partial differential equation solvers. Results of the calculation of an elasticity problem and
of a transient fluid dynamics problem involving thousands of mesh refinements, and load balancings are finally presented.
ID="A1" Correspondence and offprint requests to: J. Remacle, Scientific Computation Research Center, Rensselaer Polytechnic Institute, 110 8th Street, Troy, NY 12180, USA.
E-mail: remacle@scorec.rpi.edu 相似文献
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David E. Singh Florin Isaila Juan C. Pichel Jesús Carretero 《The Journal of supercomputing》2009,47(1):53-75
In this paper, we present a novel multiple phase I/O collective technique for generic block-cyclic distributions. The I/O
technique is divided into two stages: inspector and executor. During the inspector stage, the communication pattern is computed
and the required datatypes are automatically generated. This information is used during the executor stage in performing the
communication and file accesses. The two stages are decoupled, so that for repetitive file access patterns, the computations
from the inspector stage can be performed once and reused several times by the executor. This strategy allows to amortize
the inspector cost over several I/O operations. In this paper, we evaluate the performance of multiple phase I/O collective
technique and we compare it with other state of the art approaches. Experimental results show that for small access granularities,
our method outperforms in the large majority of cases other parallel I/O optimizations techniques.
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Jesús CarreteroEmail: |
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并行数据库系统的体系结构 总被引:1,自引:0,他引:1
一、引言 进入九十年代以来,越来越多的应用表明,传统的大型计算机系统缺乏支持高性能联机事务处理和复杂查询操作的能力。当今数据库规模的急剧澎胀、数据库工作负载的日益加重,以及新的应用领域的不断出现和成熟,已使传统的大型计算机达到了性能的极限。例如,美国国家专利局的信息数据库的信息量高达25太字节(1980年)[1],即使使用目前最快的大型机,按每秒处理100兆字节的处理速度,要把这个数据库全部检索一遍,也要花费100小时。设计支持海量数据和满足实时要求的高性能的数据库系,统已经成为数据库研究领域所面临的一项严峻挑战。 相似文献
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