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检索条件"任意字段=IASTED International Conference on Parallel and Distributed Computing and Networks, PDCN 2009"

共 488 条记录，以下是91-100 订阅

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Automated dynamic redistribution of virtual operating systems under the xen virtual machine monitor

Automated dynamic redistribution of virtual operating system...

引用

international conference on parallel and distributed computing and networks

作者： Vachon, Travis F. Teresco, James D. Williams Coll Dept Comp Sci Williamstown MA 01267 USA

ISBN: (纸本)9780889866379

Operating system virtualization has recently become a popular technique to achieve better resource utilization in so-called '' server farm '' environments. This technique provides a virtual hardware interface on top of which one can run multiple instances of popular operating systems. The Xen Virtual Machine Monitor is an implementation of operating system virtualization that supports live migration, the transfer of a virtual operating system from one physical machine to another with minimal down time. We have utilized this capability to implement a monitoring and dynamic reconfiguration daemon that attempts to equalize the load on all host nodes in a group of machines running Xen. We have also implemented a simulator for testing balancing algorithms. Experiments using these tools have provided insight into the redistribution of virtualized operating systems and how this differs from the more thoroughly-studied problem of process-level load balancing.

关键词： parallel computing systems virtual operating systems dynamic load balancing

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e-Infrastructure support for nanoCMOS device and circuit simulations

e-Infrastructure support for nanoCMOS device and circuit sim...

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9th iasted international conference on parallel and distributed computing and networks, pdcn 2010

作者： Sinnott, R.O. Stewart, G. Asenov, A. Millar, C. Reid, D. Roy, G. Roy, S. Davenhall, C. Harbulot, B. Jones, M. National E-Science Centre University of Glasgow United Kingdom Dept of Electronics and Electrical Engineering University of Glasgow United Kingdom National E-Science Centre University of Edinburgh United Kingdom Research Computing Services University of Manchester United Kingdom

ISBN: (纸本)9780889868205

The UK e-Science EPSRC pilot project Meeting the Design Challenges of nanoCMOS Electronics (***) was funded to address the challenges facing the global electronics semiconductor industry caused by the decreasing size of Complementary Metal Oxide Semiconductor (CMOS) transistors and the atomic variability present in devices manifest at these dimensions. Fundamental problems to be addressed include the modelling, understanding and predicting the effect of differences in the atomic structure of devices on their behaviour, and then using this information to guide electronic circuit and system designers who utilise CMOS components. In this paper we describe the e-Infrastructure that has been developed as part of the nanoCMOS project and outline how it supports large scale high performance computing (HPC) simulations of ensembles of devices which can subsequently be used to model and understand the impact that they have on very large electronic circuits. Key features of this e-Infrastructure include support for very large scale HPC utilization;dealing with federated data sets and associated metadata from multi-level simulations, and addressing challenges related to security and intellectual property protection of data, simulation codes and electronic designs as a whole.

关键词： Security of data

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Optimal scheduling of task graphs on parallel systems

Optimal scheduling of task graphs on parallel systems

引用

international conference on parallel and distributed computing and networks

作者： Sinnen, Oliver Kozlov, Alexci Vladimirovich Shahul, Ahmed Zaki Semar Univ Auckland Dept Elect & Comp Engn Private Bag 92019 Auckland New Zealand

ISBN: (纸本)9780889866379

Scheduling tasks onto the processors of a parallel system is a crucial part of program parallelisation. Due to the NP-hardness of the task scheduling problem, scheduling algorithms are based on heuristics that try to produce good rather than optimal schedules. Nevertheless, in certain situations it is desirable to have optimal schedules, for example for time critical systems or to evaluate scheduling heuristics. This paper proposes a scheduling algorithm based on A* that can produce optimal schedules in reasonable time for small task graphs. A* is a best-first state space search algorithm. In comparison to a previous approach, the here presented scheduling algorithm has a significantly reduced search space due to a much improved cost function f (s) and additional pruning techniques. Experimental results reveal the relation between the runtime of the algorithm and the structure of the task graphs. Further, it is shown that the proposed algorithm significantly outperforms the previous approach.

关键词： scheduling task graphs optimal schedules A*

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Automated distributed simulation in ptolemy II

Automated distributed simulation in ptolemy II

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international conference on parallel and distributed computing and networks

作者： Cuadrado, Daniel Lazaro Ravn, Anders P. Koch, Peter Aalborg Univ Niels Jernes Vej 12 Aalborg 9220 Denmark

ISBN: (纸本)9780889866379

Despite the well known advantages of distributed processing for intensive computations like simulation, frameworks often fail to exploit them. A distributed simulation is harder to develop than a sequential one, because it is necessary to interface and map activities to processors and handle the ensuing communication and synchronization problems. Very often the designer has to explicitly specify extra information concerning distribution for the framework to make an effort to exploit parallelism. This paper presents Automated distributed Simulation (ADS), which allows the designer to forget about distribution concerns while benefiting from the advantages. ADS relies on the actor formalism. It is realized as an open source implementation for the Ptolemy II simulation framework. Experiments compare different topologies, granularities and number of blocks, achieving linear speedups for practical cases. We implement pipelining techniques so iterative models with purely sequential topologies can benefit from ADS.

关键词： distributed processing automatic deployment simulation actor Ptolemy speedup

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A high collusion-resistant approach to distributed privacy-preserving data mining

A high collusion-resistant approach to distributed privacy-p...

引用

international conference on parallel and distributed computing and networks

作者： Urabe, Shintaro Wang, Jiahong Kodama, Eiichiro Takata, Toyoo Iwate Prefectural Univ Fac Software & Informat Sci 152-52 Sugo Takizawa Iwate 0200193 Japan

ISBN: (纸本)9780889866379

Data mining across different companies, organizations, online shops, or the likes is necessary so as to discover valuable shared patterns, associations, trends, or dependencies in their shared data. Privacy, however, is a concern. In many situations it is required that data mining should be conducted without any privacy being violated. In response to this requirement, this paper proposes an effective distributed privacy-preserving data mining approach called CRDM (Collusion-Resistant Data Mining). CRDM is characterized by its ability to resist the collusion. Let the number of sites participating in data mining be M. Unless the number of colluding sites is not less than M - 1, privacy cannot be violated. Results of both analytical and experimental performance study demonstrated the effectiveness of CRDM.

关键词： data mining preserving privacy distributed processing collusion-resistance

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Mcore: A simple structure for effective overlay multicast on mobile ad hoc networks

Mcore: A simple structure for effective overlay multicast on...

引用

18th iasted international conference on parallel and distributed computing and Systems

作者： Li, Yamin Peng, Shietung Chu, Wanming Hosei Univ Dept Comp Sci Tokyo 1848584 Japan Univ Aizu Dept Comp Hardware Aizu Wakamatsu Fukushima 9658580 Japan

ISBN: (纸本)9780889866386

Overlay multicast protocol constructs a virtual mesh spanning all member nodes of a multicast group and employs standard unicast routing to fulfill multicast functionality on application layer. The advantages of this approach are simplicity and flexibility. However, efficiency and stability are the issues that must be addressed as the size of the multicast group grows in the mobile ad hoc networks (MANETs). In this paper, we propose an effective structure for overlay multicast to solve these problems in MANETs. Instead of using a spanning tree on the virtual mesh, we adopt a simple structure called MCore for multicast. An MCore is a path that minimizes the sum of the distances of all vertices to the path plus the length of the path. The MCore is more stable and easier to maintain than the spanning tree in MANETs. The simulation results show that our approach handles the flexibility and mobility issues in overlay multicast protocols effectively for large multicast group size.

关键词： mobile ad hoc networks (MANETs) multicast overlay mesh efficiency stability distributed algorithm

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Optimising data movement rates for parallel processing applications on graphics processors

Optimising data movement rates for parallel processing appli...

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international conference on parallel and distributed computing and networks

作者： Harrison, Owen Waldron, John Trinity Coll Dublin Comp Architecture Grp Dublin 2 Ireland

ISBN: (纸本)9780889866379

Graphics processing units(GPUs) are starting to play an increasingly important role in non-graphical applications which are highly parallelisable. With the latest graphics cards boasting a theoretical 165GFlops and 54GB/s memory bandwidth spread across 48 ALUs it is easy to see why. The GPU architecture is particularly suited to the parallel stream processing paradigm of low levels of data dependency, high data to instruction ratio and predictable memory access patterns. One largely ignored, yet key, bottleneck for this type of processing on GPUs is both download and readback transfer performance to and from the graphics card. Existing tools provide great developer assistance in many areas of GPU application development, though provide very limited assistance in gaining the best bi-directional data transfer performance. In this paper, we discuss these limitations and present new investigative tools which allow general purpose processing GPU developers to explore the complex array of configuration states which affect both the download and readback performance.

关键词： parallel processing high performance computing graphics processors transfer rates

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parallelism of double Divide and Conquer algorithm for singular value decomposition

Parallelism of double Divide and Conquer algorithm for singu...

引用

international conference on parallel and distributed computing and networks

作者： Konda, Taro Tsuboi, Hiroaki Takata, Masami IIwasaki, Masashi Nakamura, Yoshimasa Kyoto Univ Grad Sch Informat Dept Appl Math & Phys Sakyo Ku Yoshida Honmachi Kyoto Japan Nara Womens Univ Grad Sch Humanity & Sci Nara Japan JST SORST Osaka Japan

ISBN: (纸本)9780889866379

This paper presents some numerical evaluations of parallel double Divide and Conquer for singular value decomposition. For eigenvalue decomposition and singular value decomposition, double Divide and Conquer was recently proposed. It rst computes eigen/singular values by a compact version of Divide and Conquer. The corresponding eigen/singular vectors are then computed by twisted factorization. The speed and accuracy of double Divide and Conquer are as good or even better than standard algorithms such as QR and the original Divide and Conquer. In addition, it is expected that double Divide and Conquer has great parallelism because each step is theoretically parallel and heavy communication is not required. This paper numerically evaluates a parallel implementation of dDC with MPI on some large scale problems using a distributed memory architecture and a massively parallel super computer, especially in terms of parallelism. It shows high scalability and super linear speed-up is observed in some cases.

关键词： parallel computing singular value decomposition eigenvalue decomposition numerical algorithm linear algebra

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Studying the performance of overlapping communication and computation by active message: Inuktitut case

Studying the performance of overlapping communication and co...

引用

iasted international conference on parallel and distributed computing and networks, as part of the 24th iasted international Multi-conference on APPLIED INFORMATICS

作者： Le-Khac, Nhien-An Laboratoire ID-IMAG ENSIMAG ZIRST 51 avenue Jean Kuntzmann 38330 Montbonnot Saint Martin France

ISBN: (纸本)0889865701

Overlapping of communication and computation has been intuitively used for a long time to improve the performance of parallel computing. One of approaches which allow increasing the ability of this overlapping is to use active message. This paper presents the study of the overlapping communication/computation performance of INUKTITUT, an interface based on active message. This interface allows effectively and easily carrying of parallel programming high-level environments such as Athapascan on the computing clusters. We will present in this paper different performance evaluations of INUKTITUT on overlapping potential.

关键词： parallel processing systems

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GDSE: A new data source oriented computing element for Grid

GDSE: A new data source oriented computing element for Grid

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iasted international conference on parallel and distributed computing and networks

作者： Ambrosi, E Ghiselli, A Taffoni, G Univ Bologna Ist Nazl Fis Nucl CNAF Bologna Dipartimento Sci Fisiche Bologna Italy

ISBN: (纸本)088986568X

In a Grid environment the main components that manage the job workflow life are the Grid Resource Layer, the Grid Information System and the Grid Information Data Model. Until now, only some of the known computational resources, such as a hardware machines and a batch queueing system, have been take into account as valid Resource Framework Layer instances. However many types of virtual computing machines exist, such as a Java Virtual Machine, a parallel Virtual Machine and a Data Source Engine. The actual representation of a Grid resource in the Grid Information System and Data Model concerns only hardware computing machines. We argue that a Data Source Engine is a valid instance for a Grid computing model. Then we define a new Grid element that enables the access to a Data Source Engine and a Data Source, totally integrated with the Grid Monitoring and Discovery System and Resource Broker.

关键词： Grid computing distributed databases access methods architectures queuing systems

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