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检索条件"任意字段=10th International Conference on Parallel and Distributed Computing, Applications and Technologies"

共 1767 条记录，以下是891-900 订阅

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Free Energy Monte Carlo Simulations on a distributed Network

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10th Nordic international conference on Applied parallel computing - State of the Art in Scientific and parallel computing (PARA)

作者： Czapla, Luke Siretskiy, Alexey Grime, John Khan, Malek O. Uppsala Univ Dept Phys & Analyt Chem Uppsala Sweden

ISBN: (纸本)9783642281440

While the use of enhanced sampling techniques and parallel computing to determine potentials of mean force is in widespread use in modern Molecular Dynamics and Monte Carlo simulation studies, there have been few methods that efficiently combine heterogeneous computer resources of varying quality and speeds in realizing a single simulation result on a distributed network. Here, we apply an algorithm based on the Monte Carlo method of Wang and Landau within a client-server framework, in which individual computing nodes report a histogram of regions of phase space visited and corresponding updates to a centralized server at regular intervals entirely asynchronously. the server combines the data and reports the sum to all nodes so that the overall free energy determination scales linearly with the total amount of resources allocated. We discuss our development of this technique and present results for molecular simulations of DNA.

关键词： Free energy

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Muhadith: A Cloud based distributed Expert System for Classification of Ahadith

Muhadith: A Cloud based Distributed Expert System for Classi...

引用

10th international conference on Frontiers of Information Technology (FIT)

作者： Bilal, Kashif Mohsin, Sajjad North Dakota State Univ Fargo ND 58105 USA COMSATS Inst Informat Technol Islamabad Pakistan

ISBN: (纸本)9780769549279;9781467349468

this paper presents a novel approach for the classification of the religious scriptures, the Hadith (sayings of Prophet Muhammad (plural Ahadith)). Muhadith is a distributed, Cloud based expert system that uses the Hadith science to classify Ahadith among 24 types from seven broad categories. Classification of the Hadith is a complex and sensitive task, and can only be performed by an expert of the Hadith sciences. Muhadith expert system is designed to imitate the Hadith experts for Hadith classification, and to enable a computer to behave like a Hadith expert to discriminate the authentic Ahadith from unauthentic ones. this paper presents the relationship and mapping of the expert system technology onto Hadith sciences, and technicalities involved in designing of the Muhadith expert system. We also propose solutions for the communicational and interoperability problems faced by the legacy web based distributed expert systems. We employ service oriented architecture to overcome the communicational problem and a candidature for the Software as a Service (SaaS) for the Cloud computing. the expert system also provides a reasoning facility that enables the user to look into the classification details. Muhadith expert system has been designed by merging the ideas from the domains of expert systems, Web technologies, and distributed computing systems. this type of an effort on the topic is rare and applying them in the domain of Hadith is our humble contribution.

关键词： Expert system Cloud computing Islam Hadith

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Code Generation for parallel Execution of a Class of Irregular Loops on distributed Memory Systems

Code Generation for Parallel Execution of a Class of Irregul...

引用

25th ACM/IEEE international conference for High Performance computing, Networking, Storage and Analysis (SC)

作者： Ravishankar, Mahesh Eisenlohr, John Pouchet, Louis-Noel Ramanujam, J. Rountev, Atanas Sadayappan, P. Ohio State Univ Columbus OH 43210 USA Louisiana State Univ Louvain Belgium

ISBN: (纸本)9781467308052;9781467308045

parallelization and locality optimization of affine loop nests has been successfully addressed for shared-memory machines. However, many large-scale simulation applications must be executed in a distributed-memory environment, and use irregular/sparse computations where the control-flow and array-access patterns are data-dependent. In this paper, we propose an approach for effective parallel execution of a class of irregular loop computations in a distributed-memory environment, using a combination of static and runtime analysis. We discuss algorithms that analyze sequential code to generate an inspector and an executor. the inspector captures the data-dependent behavior of the computation in parallel and without requiring complete replication of any of the data structures used in the original computation. the executor performs the computation in parallel. the effectiveness of the framework is demonstrated on several benchmarks and a climate modeling application.

关键词： distributed memory systems optimisation program compilers program diagnostics shared memory systems

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Cray Cascade: a Scalable HPC System based on a Dragonfly Network

Cray Cascade: a Scalable HPC System based on a Dragonfly Net...

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25th ACM/IEEE international conference for High Performance computing, Networking, Storage and Analysis (SC)

作者： Faanes, Greg Bataineh, Abdulla Roweth, Duncan Court, Tom Froese, Edwin Alverson, Bob Johnson, Tim Kopnick, Joe Higgins, Mike Reinhard, James Cray Inc Chippewa Falls WI 54729 USA

ISBN: (纸本)9781467308052;9781467308045

Higher global bandwidth requirement for many applications and lower network cost have motivated the use of the Dragonfly network topology for high performance computing systems. In this paper we present the architecture of the Cray Cascade system, a distributed memory system based on the Dragonfly [1] network topology. We describe the structure of the system, its Dragonfly network and the routing algorithms. We describe a set of advanced features supporting both mainstream high performance computing applications and emerging global address space programing models. We present a combination of performance results from prototype systems and simulation data for large systems. We demonstrate the value of the Dragonfly topology and the benefits obtained through extensive use of adaptive routing.

关键词： Interconnect technologies parallel and scalable system architectures performance evaluation and measurement of real systems

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parallelization of Multilevel ILU Preconditioners on distributed-Memory Multiprocessors

Parallelization of Multilevel ILU Preconditioners on Distrib...

引用

10th Nordic international conference on Applied parallel computing - State of the Art in Scientific and parallel computing (PARA)

作者： Aliaga, Jose I. Bollhoefer, Matthias Martin, Alberto F. Quintana-Orti, Enrique S. Univ Jaume 1 Dpto Ingn & Ciencia Computadores Castellon de La Plana Spain TU Braunschweig Inst Computat Math Braunschweig Germany

ISBN: (纸本)9783642281501;9783642281518

In this paper we investigate the parallelization of the ILUPACK library for the solution of sparse linear systems on distributed-memory multiprocessors. the parallelization approach employs multilevel graph partitioning algorithms in order to identify a set of concurrent tasks and their dependencies, which are then statically mapped to processors. Experimental results on a cluster of Intel QuadCore processors report remarkable speed-ups.

关键词： Sparse linear system iterative solver preconditioner ILU decomposition MPI distributed-memory multiprocessor

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Turning control flow graphs into function calls: Code generation for heterogeneous architectures

Turning control flow graphs into function calls: Code genera...

引用

2012 10th Annual international conference on High Performance computing and Simulation, HPCS 2012

作者： Barrio, Pablo Carreras, Carlos Sierra, Roberto Kenter, Tobias Plessl, Christian E.T.S.I. Telecomunicacín Universidad Politécnica de Madrid Spain Paderborn Center for Parallel Computing Universität Paderborn Spain

ISBN: (纸本)9781467323598

Heterogeneous machines are gaining momentum in the High Performance computing field, due to the theoretical speedups and power consumption. In practice, while some applications meet the performance expectations, heterogeneous architectures still require a tremendous effort from the application developers. this work presents a code generation method to port codes into heterogeneous platforms, based on transformations of the control flow into function calls. the results show that the cost of the function-call mechanism is affordable for the tested HPC kernels. the complete toolchain, based on the LLVM compiler infrastructure, is fully automated once the sequential specification is provided. © 2012 IEEE.

关键词： Codes (symbols)

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A Software Tool for Federated Simulation of Wireless Sensor Networks and Mobile Ad Hoc Networks

A Software Tool for Federated Simulation of Wireless Sensor ...

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10th Nordic international conference on Applied parallel computing - State of the Art in Scientific and parallel computing (PARA)

作者： Niewiadomska-Szynkiewicz, Ewa Sikora, Andrzej Res & Acad Comp Network NASK PL-02796 Warsaw Poland

ISBN: (纸本)9783642281501;9783642281518

the applicability of parallel discrete event simulation to design and evaluation of ad hoc networks is discussed. In this paper we describe the design, functionality, implementation and performance of our software system named MobASim. It is a Java-based integrated framework for wireless sensor and mobile ad hoc networks simulation performed on parallel computers and computer clusters that utilizes the paradigm of federating simulators and asynchronous distributed simulation technology. the computational results presented in the final part of the paper show the efficiency of parallel simulation performed upon MobASim and the application of our tool to design self-organizing communication network.

关键词： Ad hoc network MANET WSN discrete event system (DEVS) parallel discrete event simulation (PDES)

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Extending distributed Shared Memory for the Cell Broadband Engine to a Channel Model

Extending Distributed Shared Memory for the Cell Broadband E...

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10th Nordic international conference on Applied parallel computing - State of the Art in Scientific and parallel computing (PARA)

作者： Skovhede, Kenneth Larsen, Morten N. Vinter, Brian Univ Copenhagen Dept Comp Sci DK-2100 Copenhagen Denmark

ISBN: (纸本)9783642281501

As the performance gains from traditional processors decline, alternative processor designs are becoming available. One such processor is the CELL-BE processor, which theoretically can deliver a sustained performance close to 205 GFLOPS per processor[10]. Unfortunately, the high performance comes at the price of a quite complex programming model. In this paper we present an easy-to-use, CSP-like, communication method, which enables transfers of shared memory objects. the channel based communication method can significantly reduce the complexity of massively parallel programs. By implementing a few scientific computational cores we show that performance and scalability of the system is acceptable for most problems.

关键词： CSP CELL-BE DSMCBE channel communication

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threadLocalMRG32k3a: A statistically sound substitute to pseudorandom number generation in parallel Java applications

ThreadLocalMRG32k3a: A statistically sound substitute to pse...

引用

2012 10th Annual international conference on High Performance computing and Simulation, HPCS 2012

作者： Passerat-Palmbach, Jonathan Mazel, Claude Hill, David R. C. Clermont Université BP 10448 F-63000 Clermont-Ferrand France CNRS UMR 6158 Université Blaise Pascal F-63173 France ISIMA Institut Supérieur d'Informatique de Modélisation et de Leurs Applications BP 10125 F-63177 France

ISBN: (纸本)9781467323598

parallel And distributed Simulations (PADS) become more and more spread since scientists always want more accurate results in the shortest time. PADS are often sensitive to several parameters, and when they own a stochastic component, one has to ensure he knows how to correctly deal with randomness in a parallel application. this point can appear to be very tricky for non-experts, who might be tempted to move this part of the simulation aside. Several software efforts have been produced in various programming languages to help developers handle pseudorandom streams partitioning in PADS. However, these tools remain third-party libraries that need to be integrated in already existing applications, and that might be hardly swappable. the latest release of the Java Development Kit (JDK 7) tries to tackle this problem with a new class called threadLocalRandom. the latter is in charge of safe pseudorandom number generation across Java threads. the present work studies the pros and cons of this approach, and introduces threadLocalMRG32k3a, an alternative to threadLocalRandom that shows better results in terms of generation speed and statistical quality. threadLocalMRG32k3a respects the same Application Programming Interface (API) as threadLocalRandom, thus enabling clients to use it in place of its JDK counterpart at no cost. © 2012 IEEE.

关键词： Object oriented programming

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Towards Scalable Optimal Sequence Homology Detection

Towards Scalable Optimal Sequence Homology Detection

引用

19th international conference on High Performance computing (HiPC)

作者： Daily, Jeff Krishnamoorthy, Sriram Kalyanaraman, Ananth Pacific NW Natl Lab Richland WA 99352 USA

ISBN: (纸本)9781467323703;9781467323727

the field of bioinformatics and computational biology is experiencing a data revolution - experimental techniques to procure data have increased in throughput, improved in accuracy and reduced in costs. this has spurred an array of high profile sequencing and data generation projects. While the data repositories represent untapped reservoirs of rich information critical for scientific breakthroughs, the analytical software tools that are needed to analyze large volumes of such sequence data have significantly lagged behind in their capacity to scale. In this paper, we address homology detection, which is a fundamental problem in large-scale sequence analysis with numerous applications. We present a scalable framework to conduct large-scale optimal homology detection on massively parallel super-computing platforms. Our approach employs distributed memory work stealing to effectively parallelize optimal pairwise alignment computation tasks. Results on 120,000 cores of the Hopper Cray XE6 supercomputer demonstrate strong scaling and up to 2.42 x 10(7) optimal pairwise sequence alignments computed per second (PSAPS), the highest reported in the literature.

关键词： Cray computers DNA bioinformatics distributed memory systems mainframes parallel machines pattern recognition

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