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检索条件"主题词=Parallel programming"

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Analysis and evaluation of the performance of CAPE

Analysis and evaluation of the performance of CAPE

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IEEE International Conference on Ubiquitous Intelligence and Computing

作者： Van Long Tran Eric Renault Viet Hai Ha SAMOVA Telecom SudParis CNRS Universite Paris-Saclay College of Education Hue University

ISBN: (纸本)9781509027729

MPI (Message Passing Interface) and OpenMP are two tools broadly used to develop parallel programs. On the one hand, MPI has the advantage of high performance while being difficult to use. On the other hand, OpenMP is very easy to use but is restricted to shared-memory architectures. CAPE is an approach based on checkpoints to allow the execution of OpenMP programs on distributed-memory architectures. This paper aims at presenting both an in-depth analysis and an evaluation of the performance of CAPE by comparing the execution model of both CAPE and MPI. Some suggestions are also provided to improve the use of CAPE.

关键词： CAPE OpenMP MPI High performance computing parallel programming

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Object Oriented MPI (OOMPI): a class library for the Message Passing Interface

Object Oriented MPI (OOMPI): a class library for the Message...

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Proceedings of the MPI Developer's Conference

作者： B.C. McCandless J.M. Squyres A. Lumsdaine Laboratory for Scientific Computing Department of Computer Science and Engineering University of Notre Dame Notre Dame IN USA

Using the Message Passing Interface (MPI) in C++ has been difficult up to this point, because of the lack of suitable C++ bindings and C++ class libraries. The existing MPI standard provides language bindings only for C and Fortran 77, precluding their direct use in object-oriented programming. Even the proposed C++ bindings in MPI-2 are at a fairly low-level and are not directly suitable for object-oriented programming. In this paper, we present the requirements, analysis and design for Object-Oriented MPI (OOMPI), a C++ class library for MPI. Although the OOMPI class library is specified in C++, in some sense the specification is a generic one that uses C++ as the program description language. Thus, the OOMPI specification can also be considered as a generic object-oriented class library specification which can thus also form the basis for MPI class libraries in other object-oriented languages.

关键词： Libraries Message passing Laboratories Scientific computing Computer science Object oriented programming parallel programming Writing programming profession Functional programming

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Techniques supporting threadprivate in OpenMP 06

Techniques supporting threadprivate in OpenMP

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International Symposium on parallel and Distributed Processing (IPDPS)

作者： X. Martorell M. Gonzalez A. Duran J. Balart R. Ferrer E. Ayguade J. Labarta Barcelona Supercomputing Center-Computer Architecture Department Technical University Catalunya Barcelona Spain

ISBN: (纸本)9781424400546

This paper presents the alternatives available to support threadprivate data in OpenMP and evaluates them. We show how current compilation systems rely on custom techniques for implementing thread-local data. But in fact the ELF binary specification currently supports data sections that become threadprivate by default. ELF naming for such areas is thread-local storage (TLS). Our experiments demonstrate that implementing threadprivate based on the TLS support is very easy, and more efficient. This proposal goes in the same line as the future implementation of OpenMP on the GNU compiler collection. In addition, our experience with the use of threadprivate in OpenMP applications shows that usually it is better to avoid it. This is because threadprivate variables reside in common blocks and they impede the compiler to fully optimize the code. So it is better to keep threadprivate as a temporary technique only to ease porting MPI codes to OpenMP

关键词： Ground penetrating radar Geophysical measurement techniques Yarn Proposals parallel processing Computer architecture Impedance Optimizing compilers parallel programming Memory architecture

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Trace-based KPN composability analysis for mapping simultaneous applications to MPSoC platforms 10

Trace-based KPN composability analysis for mapping simultane...

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Design, Automation and Test in Europe Conference and Exhibition

作者： Jeronimo Castrillon Ricardo Velasquez Anastasia Stulova Weihua Sheng Jianjiang Ceng Rainer Leupers Gerd Ascheid Heinrich Meyr Institute of Integrated Signal Processing Systems (ISS) RWTH Aachen University Germany ALaRI Institute Lugano Switzerland

ISBN: (纸本)9783981080162

Nowadays, most embedded devices need to support multiple applications running concurrently. In contrast to desktop computing, very often the set of applications is known at design time and the designer needs to assure that critical applications meet their constraints in every possible use-case. In order to do this, all possible use-cases, i.e. subset of applications running simultaneously, have to be verified thoroughly. An approach to reduce the verification effort, is to perform composability analysis which has been studied for sets of applications modeled as Synchronous Dataflow Graphs. In this paper we introduce a framework that supports a more general parallel programming model based on the Kahn Process Networks Model of Computation and integrates a complete MPSoC programming environment that includes: compiler-centric analysis, performance estimation, simulation as well as mapping and scheduling of multiple applications. In our solution, composability analysis is performed on parallel traces obtained by instrumenting the application code. A case study performed on three typical embedded applications, JPEG, GSM and MPEG-2, proved the applicability of our approach.

关键词： Simultaneous localization and mapping Performance analysis Computational modeling parallel programming Computer networks Concurrent computing programming environments Program processors Analytical models Processor scheduling

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parallel implementation of image matching with MPI

Parallel implementation of image matching with MPI

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Ismail Sheikh Alfonso Oviedo Alejandro Emerio Nagi Mekhiel Ryerson University Toronto ON CA Dept. of Electrical & Computer Engineering (ECE) Ryerson University Toronto Canada

In this paper, the performance of parallel computing will be thoroughly discussed in the domain of image matching. The concept of image matching is widely used in the areas of security, medical and computer vision which require comparing two images for similarities. However, depending on the size of images, it is highly possible that the application computation cannot be handled in a single processor running a sequential algorithm. In order to overcome this limitation, parallel computing is introduced through the Message Passing Interface (MPI) library. In this project, for the comparison of two images, both images are first converted into grayscale and then are compared using the Sum of Square Differences (SSD) algorithm. Further, a parallel network of 12 processors was implemented for image matching and to calculate the performance of the SSD algorithm between both images. The performance gain of 12, 8, 4 and 2 processors was compared with the performance of a single processor. The comparison results presented a linear relationship between the performance gain and the number of processors used for execution. Hence, it proves that there are significant benefits of parallelism on SSD applications.

关键词： Computational modeling Image matching Computers Performance gain parallel processing parallel programming Mathematical model

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Modeling a network processor using object oriented techniques

Modeling a network processor using object oriented technique...

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Euromicro Symposium on Digital System Design

作者： L. Noonan Department of Electronic and Computer Engineering University of Limerick Limerick IRELAND

In this paper we examine how a network processor can be modeled using object-oriented techniques. We examine the Intel IXP 1200 network processor and discuss how the object-oriented language POOSL was utilized to allow an evaluation of a system before implementing it with hardware and software components. With the case study of the IXP 1200, we illustrate the suitability of object-oriented languages for system level modeling and design exploration.

关键词： Object oriented modeling Hardware Performance analysis Iterative methods parallel programming Electronic mail Distributed processing parallel processing Process design Measurement

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Balancing interprocessor communication and computation on torus-connected multicomputers running compiler-parallelized code

Balancing interprocessor communication and computation on to...

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Scalable High Performance Computing Conference

作者： M. Annaratone R. Ruhl Digital Equipment Corporation Maynard MA USA Integrated Systems Laboratory Swiss Federal Institute of Technology Zurich Switzerland Integrated Syst. Lab. Swiss Federal Inst. of Technol. Zurich Switzerland

The machine model considered in this paper is that of a distributed memory parallel processor (DMPP) with a two-dimensional torus topology. Within this framework, the authors study the relationship between the speedup delivered by compiler-parallelized code and the machine's interprocessor communication speed. It is shown that compiler-parallelized code often exhibits more interprocessor communication than manually parallelized code and that the performance of the former is therefore more sensitive to the machine's interprocessor communication speed. Because of this, a parallelizing compiler developed for a platform not explicitly designed to sustain the increased interprocessor communication will produce-in the general case-code that delivers disappointing speedups. Finally, the study provides the point of diminishing return for the interprocessor communication speed beyond which the DMPP designer should focus on improving other architectural parameters, such as the local memory-processor bandwidth.< >

关键词： Concurrent computing Distributed computing Topology Space technology Communication channels Context modeling Laboratories Bandwidth parallel programming Communication standards

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Scientific programming for Heterogeneous Systems - Bridging the Gap between Algorithms and Applications

Scientific Programming for Heterogeneous Systems - Bridging ...

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International Conference on parallel Computing in Electrical Engineering (PARLEC)

作者： A. Lastovetsky School of Computer Science and Informatics University College Dublin Ireland

High performance computing in heterogeneous environments is a dynamically developing area. A number of highly efficient heterogeneous parallel algorithms have been designed over last decade. At the same time, scientific software based on the algorithms is very much under par. The paper analyses main issues encountered by scientific programmers during implementation of heterogeneous parallel algorithms in a portable form. It explains how programming systems can address the issues in order to maximally facilitate implementation of parallel algorithms for heterogeneous platforms and outlines two existing programming systems for high performance heterogeneous computing, mpC and HeteroMPI

关键词： High performance computing parallel algorithms Algorithm design and analysis parallel programming Concurrent computing Distributed computing Application software Software algorithms programming profession Supercomputers

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parallelization by the divide-and-conquer method

Parallelization by the divide-and-conquer method

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IEEE International Conference on Systems, Man and Cybernetics

作者： Q. Yang C. Yu Department of Electrical Engineering and Computer Engineering University of Illinois Chicago Chicago IL USA

A precise characterization for problems to be parallelized by the divide-and-conquer method is obtained. A parallel algorithm for such problems, which is likely to cluster data such that a substantial amount of computation is carried out within sites and communication cost is manageable, is developed. The characterization turns out to be very simple, yet general enough to cover concrete problems in many disciplines, such as sorting, computing the transitive closure of a binary relation, and computing a minimal cover in decomposing relations into 3NF forms. A linear recursive program is given to describe problems to be parallelized.< >

关键词： parallel processing parallel algorithms Concrete Sorting programming profession Merging Databases Concurrent computing Costs parallel programming

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An intelligent programming environment for multiprocessor systems

An intelligent programming environment for multiprocessor sy...

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New Zealand International Two-Stream Conference on Artificial Neural Networks and Expert Systems

作者： E. Trichina Department of Computer Science Joensuu University Joensuu Finland

The author reports on an expert system, PrIAM, that supports programming for distributed memory massively parallel computers using graphical visualization as a centerpiece. The system provides mechanisms for the concise formal specification of families of numerical algorithms, their visualization as annotated graphs, a powerful set of formal (semantic and syntactic) transformations to tailor the specification to suit distributed memory multiprocessors, and dynamic graphical animation of the behavior of message-passing parallel programs with graphical summaries of their performance. For the most part, PrIAM is a straightforward expert system with three components: the user interface, the database, and the rule base. As much of PrIAM as possible has been pushed into the user interface, yielding a system that is easy to use and maintain. PrIAM currently serves two purposes: as a tutoring system to support lecture courses in parallel programming, and as a part of a programming environment for transputer-based multiprocessor systems.< >

关键词： programming environments Multiprocessing systems Expert systems parallel programming Visualization User interfaces Concurrent computing Distributed computing Formal specifications Animation

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