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检索条件"任意字段=Proceedings of the Advances in Parallel and Distributed Computing"

共 506 条记录，以下是401-410 订阅

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"SEQ OF PAR" style structured parallel programming

"SEQ OF PAR" style structured parallel programming

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proceedings of the advances in parallel and distributed computing

作者： Wei Yuan Yongqiang Sun Department of Computer Science Shanghai Jiaotong University Shanghai China

ISBN: (纸本)0818678763

This paper presents a new structured parallel programming model, "SEQ OF PAR", based on the Communication Closed Layer (CCL) principle of causal composition for parallel programs and Bird-Meertens formalism (BMF) of locality-based parallel computation. This model is to support for more general, architecture-independent parallel programming. It provides a structured approach to integrate task (or process) parallelism and data-parallelism in one framework. The well-founded algebra of CCL and BMF makes it also possible to derive, optimize and verify parallel programs through algebraic transformations. Experimental results show that it is very promising to adopt this programming model for getting efficient, portable parallel code.

关键词： parallel programming parallel processing Concurrent computing Sun Computer science Costs Bismuth Algebra Software development management Functional programming

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Solving sparse least squares problems on massively distributed memory computers

Solving sparse least squares problems on massively distribut...

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proceedings of the advances in parallel and distributed computing

作者： Tianruo Yang Department of Computer science Linköping University Sweden

ISBN: (纸本)0818678763

In this paper we study the parallel aspects of PCGLS, a basic iterative method whose main idea is to organize the computation of conjugate gradient method with preconditioner applied to normal equations, and incomplete modified Gram-Schmidt (IMGS) preconditioner for solving sparse least squares problems on massively parallel distributed memory computers. The performance of these methods on this kind of architecture is always limited because of the global communication required for the inner products. We describe the parallelization of PCGLS and IMGS preconditioner by two ways of improvement. One is to assemble the results of a number of inner products collectively and the other is to create situations when communication can be overlapped with computation. A theoretical model of computation and communication phases is presented which allows us to decide the number of processors that minimizes the runtime. Several numerical experiments on Parsytec GC/PowerPlus are presented.

关键词： Least squares methods Concurrent computing distributed computing Iterative methods Gradient methods Equations Computer architecture Global communication Assembly Computational modeling

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An improved parallel algorithm for Delaunay triangulation on distributed memory parallel computers

An improved parallel algorithm for Delaunay triangulation on...

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proceedings of the advances in parallel and distributed computing

作者： Sangyoon Lee Chan-Ik Park Chan-Mo Park Department of Computer Science and Engineering PRL POSTECH Pohang South Korea

ISBN: (纸本)0818678763

Delaunay triangulation has been much used in such applications as volume rendering, shape representation, terrain modeling and so on. The main disadvantage of Delaunay triangulation is large computation time required to obtain the triangulation on an input points set. This time can be reduced by using more than one processor, and several parallel algorithms for Delaunay triangulation have been proposed. In this paper, we propose an improved parallel algorithm for Delaunay triangulation, which partitions the bounding convex region of the input points set into a number of regions by using Delaunay edges and generates Delaunay triangles in each region by applying an incremental construction approach. Partitioning by Delaunay edges makes it possible to eliminate merging step required for integrating subresults. It is shown from the experiments that the proposed algorithm has good load balance and is more efficient than Cignoni et al.'s algorithm (1993) and our previous algorithm (1996).

关键词： parallel algorithms Concurrent computing distributed computing Partitioning algorithms parallel processing Shape Merging Solid modeling Computer science Rain

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On the optimization by redundancy using an extended LogP model

On the optimization by redundancy using an extended LogP mod...

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proceedings of the advances in parallel and distributed computing

作者： J. Eisenbiegler W. Lowe A. Wehrenpfennig Institut für Programmstrukturen und Datenorganisation Universität Karlsruhe Karlsruhe Germany Institut für Rechnersysteme Universität Dresden Dresden Germany

We present a strategy for optimizing parallel algorithms introducing redundant computations. In order to calculate the optimal amount of redundancy, we generalize the LogP model to capture messages of varying sizes using functions instead of constants for the machine parameters. We validate our method for a wave simulation algorithm on a Parsytec PowerXplorer with eight processors and a workstation cluster with four workstations.

关键词： Electronic mail Workstations Computational efficiency Phase change random access memory Delay Bandwidth parallel algorithms Concurrent computing Tellurium Computational modeling

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Language support for synchronous parallel critical sections

Language support for synchronous parallel critical sections

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proceedings of the advances in parallel and distributed computing

作者： C.W. Kessler H. Seidl Facbereich IV-Inf. Trier Univ. Germany Fachbereich IV-Informatik Universität Trier Trier Germany

We introduce a new parallel programming paradigm, namely synchronous parallel critical sections. Such parallel critical sections must be seen in the context of switching between synchronous and asynchronous modes of computation. Thread farming allows to generate bunches of threads to solve independent subproblems asynchronously and in parallel. Opposed to that, synchronous parallel critical sections allow to organize bunches of asynchronous parallel threads to execute certain task jointly and synchronously. We show how the PRAM language Fork95 can be extended by a construct join supporting parallel critical sections. We explain its semantics and implementation, and discuss possible applications.

关键词： Yarn parallel programming Databases Concurrent computing Phase change random access memory Resource management Frequency Personal communication networks parallel algorithms parallel languages

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parallel matrix computations and their applications for biomagnetic fields

Parallel matrix computations and their applications for biom...

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proceedings of the advances in parallel and distributed computing

作者： V. Zerbe H. Keller G. Schorcht Faculty of Computer Science and Automation Technical University Ilmenau Germany

In this paper we present the results of a parallel implementation of a heart field simulation algorithm. The application of biomagnetic fields offers a wide range for using parallel algorithms. Pathological changes in the human body, especially in the heart muscle, can be diagnosed and localised by means of biomagnetic field parameters. The benefit of this diagnosis method is to fit an individual reference model of the heart field of a patient. Based on differences between the reference model and the real measured biomagnetic field parameters, the type and the position of defects in the heart can be located. The most time consuming components of the whole algorithm are the matrix computations, especially the matrix inversion. The matrix inversion can be implemented on a parallel distributed memory system. In this paper we discuss the routing, the parallel matrix inversion, and the speed up for different network topologies that depends on the number of processors and different problem sizes.

关键词： Computer applications Concurrent computing Biomagnetics Heart Biological system modeling Computational modeling parallel algorithms Pathology Humans Muscles

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On distributed snapshot algorithms

On distributed snapshot algorithms

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proceedings of the advances in parallel and distributed computing

作者： Letian He Yongqiang Sun Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai China

ISBN: (纸本)0818678763

Snapshot algorithms are fundamental for many distributed applications and must often be executed repeatedly. We present three snapshot algorithms. The first one is based on the assumption of global time, it computes channel states using several schemes. Taking consistent cut for global time instant, we show that the algorithm is applicable for existing snapshot algorithms. The second one is a real token passing based algorithm for non-FIFO asynchronous distributed systems. Its message complexity of control messages is O(n). The last algorithm is the repeated version of the second one. Using this algorithm, processes can get consistent global states at their convenience concurrently.

关键词： distributed computing Helium Sun Computer science Application software System recovery Control systems Control system synthesis Message passing Delay

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The /spl chi/-calculus

The /spl chi/-calculus

引用

proceedings of the advances in parallel and distributed computing

作者： Yuxi Fu Department of Computer Science Shanghai Jiaotong University Shanghai China

ISBN: (纸本)0818678763

The paper proposes a new process algebra, called /spl chi/-calculus. The language differs from /spl pi/-calculus in several aspects. First it takes a more uniform view on input and output. Second, the closed names of the language are homogeneous in the sense that there is only one kind of bound name. Thirdly, the effects of communications in /spl chi/-calculus are delimited by localization operators, not by sequentiality combinator. Finally, the language cherishes more freedom of parallelism than /spl pi/-calculus. The algebraic properties of /spl chi/-processes are studied in terms of local bisimulation. It is shown that local bisimilarity is a congruence equivalence on /spl chi/-processes.

关键词： Concurrent computing Calculus parallel processing Computational modeling Algebra

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Study and design of scalable memory-shared multiprocessing system

Study and design of scalable memory-shared multiprocessing s...

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proceedings of the advances in parallel and distributed computing

作者： Chengqing Ye Zhonghai Wu Changsheng Yang Department of Computer Sciences and Technology Zhejiang University Hangzhou China

ISBN: (纸本)0818678763

This paper proposes the design of a scalable memory-shared multiprocessing system SMMP which supports Client/Server mode. SMMP system is composed of two-level interconnection networks, three-level memory subsystem and three-level I/O subsystem. There are many advantages in the design of our SMMP, such as scalable, easy to implement and operate, general purpose and large I/O throughput. It can be an excellent server for high-speed communication network.

关键词： Multiprocessing systems File servers Network servers Sun Workstations Throughput Process design Multiprocessor interconnection networks Microcomputers Concurrent computing

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parallel implementation of the boundary element method using PVM and HPF on a collection of networked workstations

Parallel implementation of the boundary element method using...

引用

proceedings of the 1997 5th International Conference on the Application of High-Performance Computers in Engineering, HPC

作者： Mushtaq, J. Davies, A.J. Univ of Hertfordshire Hertfordshire United Kingdom

Solving large computationally intensive problems requires significant processing power and the current trend in achieving this power is not by increasing the throughput of individual processors, but to sub-divide the problem into co-operating tasks so that many processors may be used to solve the problem. Stand-alone workstations, such as the PC and the SUN machines, delivering tens of millions of operations per second are common place, but to achieve high parallel efficiency, distributed systems must support rapid communication between a large number of processors on a single coherent network. parallel programming packages have been developed to assist in parallel program development, such as the parallel Virtual Machine (PVM) and High Performance Fortran (HPF). In this paper we present an analysis of PVM and HPF within the context of the boundary element method. Domain decomposition is used to sub-divide and distribute a two-dimensional potential problem onto a collection of networked stand-alone workstations using PVM and HPF. We observe that the development of parallel applications using HPF is very efficient and straight forward when compared with PVM. However, PVM offers a better performance efficiency and a greater degree of freedom than HPF, since PVM allows both coarse and fine-grained parallelism. The performance of PVM and HPF are further compared with that of the 3L parallel Fortran on a T800 transputer network.

关键词： parallel processing systems

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