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17th international conference on parallel and distributed computing Systems, PDCS 2004

作者： Hluchy, L. Gatlal, E. Habala, O. Maliska, M. Tran, V.D. Astalos, J. Sirao, B. Dobrucky, M. Heinzlreiter, P. Institute of Informatics Slovak Academy of Sciences Dubravska cesta 9 Bratislava84507 Slovakia GUP Jon. Kepler University Linz Altenbergerstr 69 LinzA-4040 Austria

ISBN: (纸本)9781618398185

In this paper the authors present the architecture and current status of implementation of a Grid-based environment for large scientific virtual organizations, with primary focus on the hydrometeorological community. the whole system *** a collaborative user Interface, a workflow system capable of submission of jobs to the Grid and a set of data management tools, including a metadata catalogue. A prototype of the system Is deployed and tested on a flood prediction scenario. the scenario contains a simulation cascade of meteorological, hydrological and hydraulic models and appropriate hydrometeorological data. © (2004) by the international Society for Computers and their applications All rights reserved.

关键词： Hydraulic models

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9th Ada-Europe international conference on Reliable Software technologies, Ada-Europe 2004

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9th Ada-Europe international conference on Reliable Software technologies, Ada-Europe 2004

ISBN: (纸本)3540220119

the proceedings contain 26 papers. the special focus in this conference is on Static Analysis, distributed Systems, Real-Time Systems, Reflection and XML. the topics include: On the role of conceptual schemas in information systems development;static deadlock detection in the Linux kernel;the chance for Ada to support distribution and real-time in embedded systems;a schizophrenic middleware to build versatile reliable distributed applications;event language for real-time on-the-fly control according to the initial requirements;implementing execution-time clocks for the Ada ravenscar profile;extending the capabilities of real-time applications by combining MARTE-OS and Linux;supporting deadlines and EDF scheduling in Ada;a randomised test approach to testing safety critical Ada code;teaching real-time systems around a digital model railroad platform using Ada;high-integrity interfacing to programmable logic with Ada;implementing an application-defined scheduling framework for Ada tasking and a theory of persistent containers and its application to Ada.

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Identifying and breaking necessary constraints to Web-based metacomputing

Identifying and breaking necessary constraints to Web-based ...

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Proceedings of the 28th Annual international Computer Software and applications conference, COMPSAC 2004

作者： Li, Wei Pun, W.K. Daniel Zhang, Minjie Faculty of Informatics and Communication Central Queensland University Australia School of IT and Computer Science University of Wollongong Australia

Metacomptiting aims at using the computing power of computers linked by networks for various applications, which used to be tackled by dedicated supercomputers a few years ago. Web-based metacomputing offers a cheap and efficient solution for parallel and distributed computing by exploiting idle cycles from the Internet. Research literatures have been published to report the state of the art of metacomputing by addressing the developed prototypes - architecture, support methodologies and technologies, programming APIs, example benchmarks and experimental performances. this paper tries to answer the question: why the metacomputing system is undesirable in performance, applicability and reliability. In this paper, the system's components are modelled as three roles: Client, Worker and Manager. their performances are individually investigated in terms of the theory of Constraint: Objectives, Requirements, Prerequisites, Conflicts and Injections for identifying core problems and exploring efficient solutions. the main contribution of this paper is to be a very first literature as conceptual guidelines for design and optimisation of metacomputing systems. © 2004 IEEE.

关键词： parallel processing systems

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Restart-able tight-coupled algorithms for SMP cluster architectures

Restart-able tight-coupled algorithms for SMP cluster archit...

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Proceedings of the 16th IASTED international conference on parallel and distributed computing and Systems

作者： Sedrakian, Ani Petiton, Serge Emad, Nahid PRISM Laboratory Versailles University 45 Ave des Etats Unis 78035 Versailles cedex France INRIA/LIFL Laboratory Science and Technologies University of Lille 59655 Villeneuve d'ascq cedex France

the current variety of parallel programming model (MPI, OpenMP,...) and the growing performance requirements for scientific applications (weather forecast, nuclear, etc.) require numerical analysis research to explore hybrid techniques. this later is a combination of several numerical techniques, or several copies of the same method parameterized differently in order to accelerate the convergence and/or to improve the accuracy of the solution of some large linear algebra problems. this paper shows how parallel collaborative computations, can outperform traditional ones by solving the communication challenge between the involved methods. Our work focuses on the hybrid computation of Krylov subspace methods, involved in solving most linear algebra problems underlying the previously mentioned large-scale applications. this paper proposes a strategy to realize an efficient hybrid computation, based on asynchronous non-blocking communication among the co-methods, and paves the way to a new approach to parallelize the tight-coupled algorithms on architecture made of cluster of shared memory nodes. By evaluating the performance of the hybrid Multiple Explicitly Restarted Arnoldi method [11] on IBM SP3 and SP4 platforms, we illustrate the effectiveness of our solution.

关键词： Algorithms

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On the performance of maestro2 high performance network equipment, using new improvement techniques

On the performance of maestro2 high performance network equi...

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23rd IEEE international Performance, computing, and Communications conference, conference Proceedings, IPCCC 2004

作者： Yamagiwa, Shinichi Ferreira, Kevin Campos, Luis Miguel Aoki, Keiichi Ono, Masaaki Wada, Koichi Fukuda, Munehiro Sousa, Leonel PDM and FC Rua Latino Coelho 87 1050-134 Lisboa Portugal Parallel/Distributed Comp. Lab. University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8573 Japan Comp. and Software Systems UW1-331 University of Washington Bothell 18815 Campus Way NE Bothell WA 98011-8246 IST/INESC-ID Rua Alves Redol 9 1000-029 Lisboa Portugal

Cluster computers have become the vehicle of choice to build high performance computing environments. To fully exploit the computing power of these environments, one must utilize high performance network and protocol technologies, since the communication patterns of parallel applications running on clusters require low latency and high throughput, not achievable by using off-the-shell network technologies. We have developed a technology to build high performance network equipment, called Maestro2. this paper describes the novel techniques used by Maestro2 to extract maximum performance from the physical medium and studies the impact of software-level parameters. the results obtained clearly show that Maestro2 is a promising technology, presenting very good results both in terms of latency and throughput. the results also show the large impact of software overhead in the overall performance of the system and validate the need for optimized communication libraries for high performance computing.

关键词： Computer networks

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Adaptive query processing and the grid: Opportunities and challenges

Adaptive query processing and the grid: Opportunities and ch...

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15th international conference on Database and Expert Systems applications (DEXA 2004)

作者： Gounaris, A Paton, NW Sakellariou, R Fernandes, AAA Univ Manchester Dept Comp Sci Manchester M13 9PL Lancs England

ISBN: (纸本)0769521959

Grid technologies have been developed in response to an increase in demand for computing applications designed to yield the benefits from collaboration, data sharing and sophisticated interaction of autonomous and geographically dispersed resources. distributed Query Processing (DQP) is an appealing solution for expressing and efficiently evaluating requests across Grid resources. In this paper: (i) we identify parts of the Grid infrastructure that facilitate, and open new directions for query processing over grid-enabled heterogeneous and autonomous databases, stressing the need for Adaptive Query Processing (AQP);(ii) we discuss some basic challenges arising from the new opportunities and outline the unsuitability for use in a Grid setting and narrow specialisation of existing proposals for AQP;and (iii) we suggest a generic adaptivity framework as a promising way forward.

关键词： Query languages

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Achieving battlespace awareness in network-centric warfare by integrating web and agent technologies

Achieving battlespace awareness in network-centric warfare b...

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9th conference on Battlespace Digitization and Network-Centric System IV

作者： McCormick, JM Gerken, PM Barry, KP Sidharta, B Lockheed Martin Adv Technol Labs Cherry Hill NJ 08002 USA

ISBN: (纸本)0819453641

Transformation of military information systems to a network-centric paradigm will remove traditional barriers to interoperability and enable dynamic access to information and analysis resources. the technical challenges of accomplishing network-centric warfare (NCW) require the engineering of agile distributed software components imbued with the ability to operate autonomously on behalf of human individuals, while maintaining system level integrity, security, and performance efficiency on a grand scale. In this paper, we will describe how agents provide a critical technology enabler for applying emerging commercial technologies, such as web services, into network-centric warfare problems. the objective of our research is developing and sharing battlespace awareness and understanding. Our agent information service manages information collection and dissemination/publishing activities on behalf of fusion services in an autonomous, yet controllable fashion. Agents improve the scalability and reliability at the system of systems level through dynamic selection and exploitation of web services based upon needs and capabilities.

关键词： agents network-centric warfare battlespace awareness web services distributed computing

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Papers From the Four international Network conference (INC 2004) - 6 - 9 July 2004 Plymouth, UK

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丛书名： Internet Research, v. 14, no. 5

2004年

作者： Fernell, Steven Emerald Publishing Limited

ISBN: (数字)9781845442187

ISBN: (纸本)9781845440541

the 4th international Network conference (INC 2004) the papers in this issue of Internet Research are based on a selection of submissions from INC 2004, the 4th international Network conference, which was held in Plymouth, UK, from 6-9 July 2004. INC events have been running since 1998, and provide a forum for sharing the latest research in computer networks and related technologies. As regular readers of Internet Research may recall, papers from previous events have provided the basis for previous themed issues of the journal. In common with previous events, INC 2004 drew a truly international audience, with authors from 24 countries. these included a diverse mixture of academic and industrial participants, ensuring that a number of different perspectives were represented in both the presentations and the subsequent discussions. the main themes addressed by the 2004 conference were Web technologies and applications, Network technologies, Security and Privacy, Mobility, and applications and Impacts. the full conference proceedings include a total of 70 papers, with coverage ranging from discussion of applications and services, down to details of specific underlying technologies[1]. the papers selected for this issue have been chosen to be representative of the broad range of topics covered by the conference, whilst at the same time addressing areas of relevance to the journal readership. To begin the discussion, Antonopoulos and Salter focus on the grid and other distributed computing environments, proposing a new model for resource discovery. their paper, which was the recipient of the INC 2004 Best Paper Prize (sponsored by Emerald and Internet Research), presents an outline of the proposed approach, and presents a comparative evaluation against existing alternatives. the grid-related discussion is maintained by Angelis et al., who consider the environment from the perspective of its security requirements. Specific attention is given to access control issues, with

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Maestro2: High speed network technology for high performance computing

Maestro2: High speed network technology for high performance...

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2004 IEEE international conference on Communications

作者： Aoki, Keiichi Yamagiwa, Shinichi Ferreira, Kevin Campos, Luis Miguel Ono, Masaaki Wada, Koichi Sousa, Leonel Paralle/Distributed Comp. Lab. University of Tsukuba 1-1-1 Tennodai Tsukuba Ibaraki 305-8573 Japan PDM and FC Rua Latino Coelho 87 1050-134 Lisboa Portugal IST/INESC-ID Rua Alves Redol 9 1000-029 Lisboa Portugal

Cluster computers have become the de facto mechanism to build high performance computing environments. To fully exploit the computing power of these environments, one must utilize high performance network and protocol technologies, since the communication patterns of parallel applications running on clusters require low latency and high throughput, not achievable by using off-the-shell network technologies. We have developed a technology to build high performance network equipment, called Maestro2. this paper describes the novel techniques used by Maestro2 to extract maximum performance from the physical medium and studies the impact of overhead in communication software. the results obtained clearly show that Maestro2 is a promising technology, presenting very good results both in terms of latency and throughput. the results also show the large impact of software overhead in the overall performance of the system and validate the need for optimized communication libraries for high performance computing.

关键词： Computer networks

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Flexible fast multipole method for magnetic simulations

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IEEE TRANSACTIONS ON MAGNETICS 2004年第4期40卷 2146-2148页

作者： Brown, G Schulthess, TC Apalkov, DM Visscher, PB Oak Ridge Natl Lab Ctr Computat Sci & Comp Sci Oak Ridge TN 37831 USA Oak Ridge Natl Lab Div Math Oak Ridge TN 37831 USA Florida State Univ Sch Computat Sci & Informat Technol Tallahassee FL 32306 USA Univ Alabama Dept Phys & Astron Tuscaloosa AL 35487 USA

the public-domain psi-Mag toolset uses generic-programming techniques to provide the computational magnetic-materials community an excellent opportunity for code reuse without loss of efficiency. psi-Mag provides a flexible implementation of the fast multipole method (FMM) for dipole-dipole calculations that does not depend on the geometry of the problem and is suitable for high-performance, parallel computers. theoretically, the execution time for such a calculation should grow only linearly with the number of spins, and this is confirmed here for up to order 105 spins. In addition, the implementation efficiently uses a large number of processors. For a test case of 64000 dipoles, the measured speedup is over 25 for 40 processors on a four-processor-per-node IBM SP;this compares quite favorably with less-flexible FMM implementations. the generic implementation allows for easy changes of the basis functions used to expand potentials specific to particular applications, facilitating direct comparison of different approaches. Here, the traditional spherical-harmonic expansions are compared to Cartesian expansions which reflect the cubic symmetries of meshes used in typical micromagnetic simulations.

关键词： distributed algorithms fast multipole method generic programming

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