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检索条件"任意字段=Seventh International Symposium on Parallel Architectures, Algorithms and Programming"

共 505 条记录，以下是251-260 订阅

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Performance Optimization of Top-k Queries on GPU

Performance Optimization of Top-k Queries on GPU

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Tao Luo Guang-Zhong Sun Guoliang Chen Key Laboratory on High Performance Computing University of Science and Technology Hefei Anhui China

With the development of web search engines, the concern on real-time performance of Top-k queries has attracted more and more attention. The author studies implement of classic algorithm - No Random Access Algorithm in order to optimize performance of Top-k queries on GPU. We give a novel GPU algorithm by using the features of CUDA's programming model. Experiment results show that an implementation of the algorithm on one GPU runs more than 7000 times faster than a single core implementation on a latest CPU.

关键词： Graphics processing unit Instruction sets Upper bound programming Algorithm design and analysis Optimization Vectors

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A parallel K-Means Clustering Algorithm with MPI

A Parallel K-Means Clustering Algorithm with MPI

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Jing Zhang Gongqing Wu Xuegang Hu Shiying Li Shuilong Hao School of Computer Science and Information Engineering Hefei University of Technology Hefei China

Clustering is one of the most popular methods for data analysis, which is prevalent in many disciplines such as image segmentation, bioinformatics, pattern recognition and statistics etc. The most popular and simplest clustering algorithm is K-means because of its easy implementation, simplicity, efficiency and empirical success. However, the real-world applications produce huge volumes of data, thus, how to efficiently handle of these data in an important mining task has been a challenging and significant issue. In addition, MPI (Message Passing Interface) as a programming model of message passing presents high performances, scalability and portability. Motivated by this, a parallel K-means clustering algorithm with MPI, called MKmeans, is proposed in this paper. The algorithm enables applying the clustering algorithm effectively in the parallel environment. Experimental study demonstrates that MKmeans is relatively stable and portable, and it performs with low overhead of time on large volumes of data sets.

关键词： Clustering algorithms Algorithm design and analysis Partitioning algorithms parallel processing Message passing Data mining Classification algorithms

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Constructing Limited Voronoi Mesh in parallel Based On Multi-core Environment and Its Implementation

Constructing Limited Voronoi Mesh in Parallel Based On Multi...

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Lanfang Dong Yuan Wu Meng Li Vision Computing and Visualization Laboratory School of Computer Science and Technology University of Science and Technology Hefei China

Voronoi mesh as the basic primitive in the field of computational geometry has been widely applied on solving fluidrelated problem by finite volume method. By analyzing various limited conditions for reasonable point distributions and modifying parallel data structure (doubly-connected list) for complex boundaries features in Voronoi mesh generation, considering the rapid development of multi-core processors and high performance computing, we present an efficient and feasible parallel algorithm of limited Voronoi mesh generation in standalone multi-core CPU environment. The algorithm solves the practical application of Voronoi mesh generation of large-scale points set; the experiment results show that this method improved the efficiency of the algorithm and could be widely used in various applications.

关键词： Program processors Mesh generation parallel algorithms Qualifications Merging Algorithm design and analysis Educational institutions

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Thread-Level parallel Generating Inter-class Test Cases

Thread-Level Parallel Generating Inter-class Test Cases

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Zhong Cheng Wu Xi-hua School of Computer and Electronics and Information Guangxi University Nanning China

A complicated class-cluster is transformed into several test blocks, and these test blocks are assigned to the processing cores on multi-core computer. Each processing core executes in parallel multiple threads to handle some test blocks. The relationship among classes in each block is represented by relational pairs, and the mutation program for each relational pair is generated by applying μJava. The generated mutants and model checker Java PathFinder(JPF) are applied to create automatically counterexample, and the test cases for class-cluster are extracted by analyzing the counterexample. The experimental results show that the presented method can speed up test generation and obtain test cases with higher quality.

关键词： Testing Java Computers Multicore processing Instruction sets Algorithm design and analysis Computational modeling

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A parallel Computing Procedure for the Lower and Upper Bounds on the Functionals of Solutions to PDE: Application to the J-Integral in Functionally Graded Materials

A Parallel Computing Procedure for the Lower and Upper Bound...

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Z.C. Xuan Department of Computer Science Tianjin University of Technology and Education Tianjin China

A parallel computing procedure for computing the bounds on the J-integral in functionally graded materials is presented based on a Neumann element a-posteriori error bound. The finite element solution of J-integral is first obtained on a coarser finite element mesh, then a-posteriori bounding procedure based on the finite element error estimate is used to compute the lower and upper bounds on the J-integral. The computation of the error estimate is performed by solving independent elemental Neumann sub problems decomposed from the finite element model, thus the computing procedure is parallel and potential to solve large scale structural problems. An example is given in the end of paper to compute the lower and upper bounds on the J-integral of functionally graded materials.

关键词： Finite element methods Mathematical model Equations Stress Upper bound Elasticity

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The Design and Implementation of OMPit: An OpenMP Compiler Characterized by Logs for parallel and Work-Sharing

The Design and Implementation of OMPit: An OpenMP Compiler C...

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Qiuming Luo Ye Cai Chengjian Liu Chang Kong National High Performance Computing Center (NHPCC) College of Computer Science and Software Engineering Shenzhen University China

There are many tools for OpenMP benchmarking which measure the various aspects of the performance, such as the overheads of OpenMP directives and the characteristics of the whole system. But we lack some tools to show us the worksharing details when the OpenMP program finished running. The OMPit (OMPi for tutoring) is designed to provide the worksharing information during the running, which can be used for tutoring and might help debugging or tuning. The work-sharing logging includes the work assignment and the timestamps for three different work-sharing behaviors. The logging information can be output as a text files or visualized figures. The designing of OMPit is provided and the details of how to inserting the logging code into the OMPi compiler is discussed too.

关键词： Debugging programming Program processors Runtime Benchmark testing Upper bound Kernel

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Improving parallel FDTD Method Performance Using SSE Instructions

Improving Parallel FDTD Method Performance Using SSE Instruc...

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Lihong Zhang Wenhua Yu School of Information Engineering Communication University of China Beijing China Fundamentals Department Chinese People's Armed Police Force Academy Langfang Hebei China Pennslyvania State University University Park PA USA

Electromagnetic researchers are often faced with long execution time and therefore algorithmic and implementation-level optimization can dramatically increase the overall performance of electromagnetism simulation using FDTD method. In this paper, we focus on acceleration implementation of 3D parallel FDTD method by taking advantage of the extended instruction sets found in modern processors, in particular the SSE instruction set. We present a SSE version of 3D parallel FDTD Method that results in a considerable 3x speedup.

关键词： Finite difference methods Time domain analysis Three dimensional displays Computational modeling Mathematical model Educational institutions Acceleration

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parallel Algorithm of Visualization of Reservoir Numerical Simulation Based on PEBI Grids

Parallel Algorithm of Visualization of Reservoir Numerical S...

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Lanfang Dong Detang Lu Meng Li Vision Computing and Visualization Laboratory School of Computer Science and Technology University of Science and Technology Hefei China Department of Modern Mechanics University of Science and Technology Hefei China

The speed of calculating, tracking and filling the isolines has a direct impact on the performance of user interaction. In this paper, we begin with the serial algorithm of visualization and implement its parallel algorithm. First, we divide the Delaunay grids generated from the PEBI grids into several regions. Calculation, tracking of isolines and calculation of saturation are implemented in each region respectively. Then the tracking results of each region are integrated for the entire work area. The parallel examples using OpenMP on computers with dual-core/quad-core are given at the end of this paper. The experimental results show that the parallel processing can greatly reduce the time required for data processing in visualization.

关键词： Instruction sets Data visualization Computers Filling Target tracking Image color analysis Educational institutions

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A Test Sequence Selection Method for parallel Software Systems

A Test Sequence Selection Method for Parallel Software Syste...

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international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Tao Sun Xinming Ye Jing Liu College of Computer Science Inner Mongolia University for the Nationalities Hohhot China

Modeling and testing for a parallel software system is very difficult, because parallel behaviors leads to system state explosion. Many testing methods are testing with a large number of redundancies. In this paper, a test sequence selection method for parallel software systems is shown. The method is based on linear behavior sequences which is preparing for testing, called LBSPT. Firstly, a formal model for software system specification is constructed based on Coloured Petri Net (CPN), called system model, and LBSPT is also modeled based on CPN, called LBSPT model. A test sequence selection method is defined on these models. The method could select all of test sequences related to LBSPT, and does not contain any redundancy. The state explode problem in software testing is solved to a certain extent. Practices show that the effect of this method is better than other methods such as random walk.

关键词： Testing Firing Redundancy Software systems Computational modeling Silicon

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Estimation of BSP Network Parameters Based on MPI-2 One-Sided Operation

Estimation of BSP Network Parameters Based on MPI-2 One-Side...

引用

international symposium on parallel architectures, algorithms and programming (PAAP)

作者： Huan Zhou Qi-long Zheng Rui Wang

The BSP network parameters are usually measured by one-sided communication functions in BSPlib standard, which can't reflect the communication performance of the message passing parallel machines effectively. Furthermore, the one-sided operation is becoming more and more popular with high-performance communication as the release of MPI-2 version. This paper further investigates the implementation of MPI-2 one-sided operation, and proposes a new estimation scheme that using the one-sided operation for BSP network parameters g and L, they are measured on the DOWNING 4000A Cluster machine under the condition of different number of processes which adopts the all-to-all total change communication mode. And it validates the correctness and the validity of the MPI program cost analysis, which makes use of the BSP model and a parallel radix-2 FFT algorithm based on the BSP model. The results prove that the new estimation scheme is effective and practical for the DOWNING Cluster machine and other similar message passing parallel machines.

关键词： Synchronization Computational modeling Protocols Estimation Algorithm design and analysis programming Analytical models

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