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检索条件"任意字段=8th International Conference on Algorithms and Architectures for Parallel Processing"

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Solving large sparse lyapunov equations on parallel computers 8th

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8th international Euro-Par conference on parallel processing, Euro-Par 2002

作者： Badía, José M. Benner, Peter Mayo, Rafael Quintana-Ortí, Enrique S. Depto. de Ingeniería y Ciencia de Computadores Universidad Jaume I Castellón12080 Spain Institut für Mathematik Technische Universität Berlin BerlinD-10623 Germany

ISBN: (纸本)3540440496

this paper describes the parallelization of the low-rank ADI iteration for the solution of large-scale, sparse Lyapunov equations. the only relevant operations involved in the method are matrix-vector products and the solution of linear systems. Experimental results on a cluster, using the Super LU library, show the performance of this approach. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Iterative methods

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Exploiting the prefetching effect provided by executing mispredicted load instructions 8th

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8th international Euro-Par conference on parallel processing, Euro-Par 2002

作者： Sendag, Resit Lilja, David J. Kunkel, Steven R. Department of Electrical and Computer Engineering Minnesota Supercomputing Institute University of Minnesota 200 Union St. S.E MinneapolisMN55455 United States IBM RochesterMN United States

ISBN: (纸本)3540440496

As the degree of instruction-level parallelism in superscalar architectures increases, the gap between processor and memory performance continues to grow requiring more aggressive techniques to increase the performance of the memory system. We propose a new technique, which is based on the wrong-path execution of loads far beyond instruction fetch-limiting conditional branches, to exploit more instruction-level parallelism by reducing the impact of memory delays. We examine the effects of the execution of loads down the wrong branch path on the performance of an aggressive issue processor. We find that, by continuing to execute the loads issued in the mispredicted path, even after the branch is resolved, we can actually reduce the cache misses observed on the correctly executed path. this wrong-path execution of loads can result in a speedup of up to 5% due to an indirect prefetching effect that brings data or instruction blocks into the cache for instructions subsequently issued on the correctly predicted path. However, it also can increase the amount of memory traffic and can pollute the cache. We propose the Wrong Path Cache (WPC) to eliminate the cache pollution caused by the execution of loads down mispredicted branch paths. For the configurations tested, fetching the results of wrong path loads into a fully associative 8-entry WPC can result in a 12% to 39% reduction in L1 data cache misses and in a speedup of up to 37%, with an average speedup of 9%, over the baseline processor. © Springer-Verlag Berlin Heidelberg 2002.

关键词： parallel processing systems

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Validated cost models for parallel OQL query processing 8th

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8th international conference on Object-Oriented Information Systems, OOIS 2002

作者： Mendes Sampaio, Sandra de F. Paton, Norman W. Smith, Jim Watson, Paul Department of Computer Science University of Manchester ManchesterM13 9PL United Kingdom Department of Computing Science University of Newcastle upon Tyne NewcastleNE1 7RU United Kingdom

ISBN: (纸本)3540440879

Query cost models are widely used, both for performance analysis and for comparing execution plans during query *** essence, a cost model predicts where time is being spent during query evaluation. Although many cost models have been proposed, for serial,parallel and distributed database systems, surprisingly few of these have been validated against real systems. this paper presents cost models forthe parallel evaluation of ODMG OQL queries, which have been compared with experimental results obtained using the Polar object database system. the paper describes the validation of the cost model for a collection of queries, using three join algorithms over the OO7 benchmark database. the results show that the cost model generally both ranks alternative plans appropriately, and gives a useful indication of the response times that can be expected from a plan. the paper also illustrates the application of the cost model by highlighting the contributions of different features and operations to query response times. © Springer-Verlag Berlin Heidelberg 2002

关键词： Distributed database systems

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Optimizing scientific databases for client side data processing 1

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8th international conference on Extending Database Technology

作者： Stolte, E Alonso, G Swiss Fed Inst Technol Dept Comp Sci ETH Zentrum CH-8092 Zurich Switzerland

ISBN: (数字)9783540458760

ISBN: (纸本)3540433244

Databases are nowadays one more building block in complex multi-tier architectures. In general, however, they are still designed and optimized with little regard for the applications that will run on top of them. this problem is particularly acute in scientific applications where the data is usually processed at the client and, hence, conventional server side optimizations are of limited help. In this paper we present a variety of techniques and a novel client/server architecture designed to optimize the client side processing of scientific data. the main building block in our approach is to store frequently accessed data as relatively small, wavelet encoded segments. these segments can be processed at different qualities and resolutions, thereby enabling efficient processing of very large data volumes. Experimental results demonstrate that our approach significantly reduces overhead (I/O, transfer across network, decoding and analysis), does not require changes to the analysis routines and provides all possible resolution ranges.

关键词： Client server computer systems

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SCALEA: A performance analysis tool for distributed and parallel programs 8th

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8th international Euro-Par conference on parallel processing, Euro-Par 2002

作者： Truong, Hong-Linh Fahringer, thomas Institute for Software Science University of Vienna Liechtensteinstr. 22 ViennaA-1090 Austria

ISBN: (纸本)3540440496

In this paper we present SCALEA, which is a performance instrumentation, measurement, analysis, and visualization tool for parallel and distributed programs that supports post-mortem and online performance analysis. SCALEA currently focuses on performance analysis for OpenMP, MPI, HPF, and mixed parallel/distributed programs. It computes a variety of performance metrics based on a novel overhead classification. SCALEA also supports multiple experiment performance analysis that allows to compare and to evaluate the performance outcome of several experiments. A highly flexible instrumentation and measurement system is provided which can be controlled by command-line options and programdirectiv es. SCALEA can be interfaced by external tools through the provision of a full Fortran90 OpenMP/MPI/HPF frontend that allows to instrument an abstract syntax tree at a very high-level with C-function calls and to generate source code. A graphical user interface is provided to view a large variety of performance metrics at the level of arbitrary code regions, threads, processes, and computational nodes for single- and multi-experiments. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Graphical user interfaces

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A duality theorem for two connectivity-preserving parallel shrinking transformations

A duality theorem for two connectivity-preserving parallel s...

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4th international conference on Cellular Automata for Research and Industry (ACRI 2000)

作者： Umeo, H Mauri, G Osaka Electrocommun Univ Grad Sch Engn Fac Informat Sci & Technol Dept Informat Engn Neyagawa Osaka 5728530 Japan Univ Milano Bicocca Dipartimento Informat Sistemat & Comun I-20126 Milan Italy

We study two classical connectivity-preserving parallel shrinking algorithms proposed to recognize and label two-dimensional connected components of binary images. the algorithms we consider were developed by Beyer [Recognition of topological invariants by iterative arrays, Ph.D. thesis, MIT, 1969, p. 144] and Levialdi [Commun. ACM 15 (1) (1972) 7] independently for the purpose of shrinking 4-connected and 8-connected components of binary images in linear time, respectively. It is shown that those two independently developed algorithms are closely related and in a sense they are in a dual relation such that, for any initially given binary image and its inverted one, one algorithm produces, simultaneously, an image which is dual of the one produced by the other, step-by-step. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： binary image processing connectivity-preserving parallel shrinking algorithm connectivity recognition labeling problem cellular automaton

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A modular design for a parallel multifrontal mesh generator 8th

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8th international Euro-Par conference on parallel processing, Euro-Par 2002

作者： Boufflet, Jean-Paul Breitkopf, Piotr Rassineux, Alain Villon, Pierre UMR 6599 HeuDiaSyc Université de Technologie de Compiègne Compiègne Cedex60205 France UMR 6066 Roberval Université de Technologie de Compiègne Compiègne Cedex60205 France

ISBN: (纸本)3540440496

the proposed approach consists in extending an existing sequential mesh generator in order to design a parallel mesh generator. A sequential three-dimensional mesh generator builds the internal mesh by applying advancing front techniques from a surface mesh defining the volume of the initial domain. We geometrically decompose the domain by recursively splitting it into subdomains using cutting planes. We run a sequential mesh generator code on different processors, each of them working on a single subdomain. the interface mesh compatibility on the two sides of two subdomains makes it possible to merge the results. We present in this paper our modular approach, an example of a interface mesh generation, and we specify the cutting plane decomposition method. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Mesh generation

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Symbolic cost estimation of parallel applications 8th

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8th international Euro-Par conference on parallel processing, Euro-Par 2002

作者： van Gemund, Arjan J. C. Delft University of Technology P.O. Box 5031 DelftNL-2600 GA Netherlands

ISBN: (纸本)3540440496

Symbolic cost models are an important performance engineering tool because of their diagnostic value and their very low solution cost when the computation features regularity. However, especially for parallel applications their derivation, including the symbolic simplifications essential for low solution cost, is an effort-intensive and error-prone process. We present a tool that automatically compiles process-oriented performance simulation models into symbolic cost models that are symbolically simplified to achieve extremely low solution cost. As the simulation models are intuitively close to the parallel program and machine under study, derivation effort is significantly reduced. Apart from its use as a stand-alone tool, the compiler is also used within a symbolic cost estimator for data-parallel programs. With minimal program annotation by the user, symbolic cost models are automatically generated in a matter of seconds, while the evaluation time of the models ranges in the milliseconds. Experimental results on four data-parallel programs show that the average prediction error is less than 15%. Apart from providing program scalability assessment, the models correctly predict the best design alternative in all cases. © Springer-Verlag Berlin Heidelberg 2002.

关键词： Cost engineering

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8th international conference on Object-Oriented Information Systems, OOIS 2002

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8th international conference on Object-Oriented Information Systems, OOIS 2002

ISBN: (纸本)3540440879

the proceedings contain 55 papers. the special focus in this conference is on Developping Web Services, Object Databases, Component, Ontology and UML Modelling. the topics include: the latest development on cognitive informatics;pluggable services for tailorable e-content delivery;an object-oriented approach for designing administrative e-forms and transactional e-services;trust objects in electronic commerce transactions;OODBMS metamodel supporting configuration management of large applications;generic applications for object-oriented databases;validated cost models for parallel OQL query processing;supporting web development in the open process;semantic integration of heterogeneous xml data sources;customization policies need more than rule objects;tool and a formalism to design and apply patterns;generating domain models from ontologies;a framework to review complex experimental knowledge;a framework to translate UML class generalization into java code;a UML variant for modeling system searchability;a methodological framework for understanding is adaptation through enterprise change;adapting analysis and design to software context;reflective analysis and design for adapting object run-time behavior;generation of object models for information systems from business system models;requirements capture workflow in global information systems;supporting development of enterprise javabeans through declarative meta programming;evaluating the DSMIO cache-coherence algorithm in cluster-based parallel ODBMS;a retrieval technique for software components using directed replaceability similarity;evaluating information systems development methods;active objects for coordination in distributed testing and a controlled experiment for validating class diagram structural complexity metrics.

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parallel external selection algorithm on distributed memory systems

Parallel external selection algorithm on distributed memory ...

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IEEE international conference on algorithms and architectures for parallel processing (ICAP)

作者： Cheng Zhong Guoliang Chen Chao Yan Department of Computer Science University of Science and Technology Hefei China School of Computer and Information Engineering Guangxi University Nanning China

ISBN: (纸本)0769515126

the external selection problem is to select the record with the K-th smallest key from the given N records that are distributed and stored evenly on the D disks for the parallel machine with D processors. Each processor has its own primary memory of size M records and one disk, where N/D>M. the processors are connected with a /spl radic/D /spl times/ /spl radic/D mesh architecture. Based on a two-stage approach, this paper presents an efficient parallel external selection algorithm for the distributed-memory parallel systems. First, all the processors execute local external sorting in parallel, each processor sorts the N/D records on its own disk. Next, they execute parallel external selection from the D sorted sub-files on the D disks. this algorithm is asymptotically optimal and has a small constant factor of time complexity.

关键词： Sorting parallel machines Algorithm design and analysis Chaos Computer science parallel algorithms Internet Databases Artificial intelligence Statistics

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