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检索条件"主题词=Parallel Programming"

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Formal description techniques in robot programming

Formal description techniques in robot programming

引用

IEE Colloquium on Application of CASE Tools

作者： D.R.W. Holton J.D.M. McKeever R.M. McKeag Dept. of Comput. Sci. Queen's Univ. Belfast UK Department of Computer Science Queen''s University Belfast Belfast UK

A study is reported whose aim was to produce a system to facilitate offline programming of robots and to provide a testbed for alternative algorithms for the services provided. The system was specified using the formal description technique LOTOS (language of temporal ordering specification). LOTOS is best known for its use in the description of OSI protocols and is supported by an ISO standard. LOTOS consists of a process algebra for specifying the structure of the system and the interactions between components of the system, and an algebraic data typing mechanism for specifying the operations the system carries out. The description of the system was heavily influenced by techniques used in the design of operating systems. Concurrency was introduced at the initial design stage, there was an explicit separation of concerns and the specification was structured hierarchically, with actions at one level appearing atomic to the next higher level. Each level in the hierarchy provides an increasingly abstract view of the robot. The resulting description was executed, or animated, using the SEDOS tool, to help determine that the correct behaviour had been encapsulated by the description. The specification was then implemented on a network of transputers, using 3L parallel Pascal.< >

关键词： Data structures Software requirements and specifications Open systems parallel programming Robot programming Specification languages

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The pilot approach to cluster programming in C

The pilot approach to cluster programming in C

引用

IEEE International Symposium on parallel and Distributed Processing Workshops and Phd Forum (IPDPSW)

作者： J. Carter W. B. Gardner G. Grewal Department of Computing and Information Science University of Guelph Guelph ONT Canada

ISBN: (纸本)9781424465330

The Pilot library offers a new method for programming parallel clusters in C. Formal elements from Communicating Sequential Processes (CSP) were used to realize a process/channel model of parallel computation that reduces opportunities for deadlock and other communication errors. This simple model, plus an application programming interface (API) fashioned on C's formatted I/O, are designed to make the library easy for novice scientific C programmers to learn. Optional runtime services including deadlock detection help the programmer to debug communication issues. Pilot forms a thin layer on top of standard Message Passing Interface (MPI), preserving the letter's portability and efficiency, with little performance impact. MPI's powerful collective operations can still be accessed within the conceptual model.

关键词： programming profession Libraries parallel programming System recovery Concurrent computing Runtime Message passing Application software Information science Computational modeling

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Specifying almost-real concurrent object-oriented programs

Specifying almost-real concurrent object-oriented programs

引用

Euromicro Workshop on parallel and Distributed Processing

作者： D. Roegel Cm-CNRS and INRIA-Lorraine Campus scientifique Vandoeuvre-les-Nancy France

parallel programming is difficult. The need for correct and efficient parallel programs is important and one way to meet this requirement is to work on the refinement chain. Beginning with a specification written in TLA/sup +/ (for instance), we can transform it-or refine it-into finer grained specifications. At some step, enough structure will have appeared so that we can bridge a gap to fill this structure. We introduce a more concrete version of TLA/sup +/, CTLA, where structuring concerns are to be expressed, but where distributing, mapping or implementation problems are avoided. Indeed, we firmly believe that it is a mistake to go immediately from TLA/sup +/ to a real language like CC++, since the ditch is still too wide. A numerical example supports our claim.

关键词： Specification languages parallel programming Encapsulation Logic programming Bridges Concrete Design methodology Object oriented programming Computer languages Concurrent computing

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Massively parallel computing in Java

Massively parallel computing in Java

引用

Working Conference on Massively parallel programming Models

作者： V. Getov S. Flynn-Hummel S. Mintchev T. Ngo University of Westminster UK IBM Thomas J. Watson Research Center USA

Although Java was not specifically designed for the computationally intensive numeric applications that are the typical fodder of highly parallel machines, its widespread popularity and portability make it an interesting candidate vehicle for massively parallel programming. With the advent of high-performance optimizing Java compilers, the open question is: How can Java programs best exploit massive parallelism? The authors have been contemplating this question via libraries of Java-routines for specifying and coordinating parallel codes. It would be most desirable to have these routines written in 100%-Pure Java; however, a more expedient solution is to provide Java wrappers (stubs) to existing parallel coordination libraries, such as MPI. MPI is an attractive alternative, as like Java, it is portable. We discuss both approaches here. In undertaking this study, we have also identified some minor modifications of the current language specification that would make 100%-Pure Java parallel programming more natural.

关键词： parallel processing Java parallel programming Libraries Computer applications Concurrent computing parallel machines Vehicles Optimizing compilers Program processors

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Multicore Scheduling Issues in Ericsson Mobile Platforms

Multicore Scheduling Issues in Ericsson Mobile Platforms

引用

International Conference on parallel Processing Workshops (ICPPW)

作者： Johan Eker Ericsson Research Limited Sweden

The multicore revolution is now happening both on the desktop and the server systems and is expected to soon enter the embedded space. For the last decades hardware manufacturers have been able to deliver more powerful CPUs by higher clock speed and advanced memory systems. However, the frequency is no longer increasing, and instead the number of cores on each CPU is. Software development for embedded uniprocessor systems is completely dominated by imperative style programming and deeply rooted in C and scheduling of threads and processes. We believe that the multicore challenge requires new methodologies and new tools to make efficient use the hardware. Data flow programming, which has received considerable attention over the years, is a promising candidate for design and implementation of certain classes of applications, such as complex media coding, network processing, imaging and digital signal processing, and embedded control, on parallel hardware. This talk discusses current problems areas within the embedded domain and presents the Open Dataflow framework. Traditionally, very little work has been done on real-time analysis and design of dataflow systems. The difficulties involved, which relates to the high level of dynamicity are discussed and some research ideas are presented.

关键词： Multicore processing Hardware Job shop scheduling Manufacturing Clocks Frequency Yarn parallel programming Signal design Digital signal processing

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Toward Using Higher-Level Abstractions to Teach parallel Computing

Toward Using Higher-Level Abstractions to Teach Parallel Com...

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IEEE International Symposium on parallel and Distributed Processing Workshops and Phd Forum (IPDPSW)

作者： Clayton Ferner Barry Wilkinson Barbara Heath University of North Carolina Wilmington NC USA University of North Carolina Charlotte NC USA East Main Evaluation & Consulting LLC Wilmington NC USA

ISBN: (纸本)9781479913725

We have developed two new approaches to teaching parallel computing to undergraduates using higher level tools that lead to ease of programming, good software design, and scalable programs. The first approach uses a new software environment that creates a higher level of abstraction for parallel and distributed programming based upon a pattern programming approach. The second approach uses compiler directives to describe how a program should be parallelized. We have studied whether using the above tools better helps the students grasp the concepts of parallel computing across the two campuses of the University of North Carolina Wilmington and the University of North Carolina Charlotte using a televideo network. We also taught MPI and OpenMP in the traditional fashion with which we could ask the students to compare and contrast the approaches. An external evaluator conducted three surveys during the semester and analyzed the data. In this paper, we discuss the techniques we used, the assignments we gave the students, and the results of what we learned.

关键词： parallel processing Educational institutions programming profession Graphics processing units parallel programming

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Performance Measurement and Analysis of High-Performance parallel Applications over Lambda Grid

Performance Measurement and Analysis of High-Performance Par...

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International Conference on Advanced Communication Technology (ICACT)

作者： Dongwook Kim Hyun-Wook Jin Karpjoo Jeong Jonghyun Lee Minki Noh Electronics and Telecommunications Research Institute South Korea Department of Computer Science and Engineering Konkuk University South Korea Department of Advanced Technology Fusion Konkuk University South Korea Department of Computing Education Sungkyunkwan University South Korea

Due to the huge computing resources the grid can provide, researchers have utilized the grid to run very large scale applications over a large number of computing and I/O nodes. However, since the computing nodes in grid are spread geographically over a wide area, communication latency varies significantly between nodes. Thus, running existing parallel applications over the whole grid can result in a worse performance even with larger number of computing nodes. Hence, in the grid environment, usually parallel applications still run on a cluster. It is expected that the emerging lambda network technology can be used for the backbone networks of grids and improve the communication performance between computing nodes. In this paper, we show the potential benefit of the lambda network for the parallel applications in grid environment. Our measurement results reveal that the NAS parallel benchmark over lambda grid can achieve more than 50% higher performance than a single cluster case. In addition, the results show that the parallel programming library such as MPI still needs to be improved with respect to the tolerance on the network delay and the topology awareness.

关键词： Measurement Performance analysis Grid computing Large-scale systems Delay Concurrent computing Spine Computer networks parallel programming Libraries

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Efficient Application Specification for Network-on-Chip Exploration

Efficient Application Specification for Network-on-Chip Expl...

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International Symposium on Intelligent Information Technology Application, IITA

作者： Zhe Zhang Xiaoming Hu School of Computer and Information Shanghai Second Polytechnic University Shanghai China

To specify dataflow applications efficiently is one of the greatest challenges facing Network-on-Chip (NoC) simulation and exploration. BTS (Behavior-level Traffic Simulation) was proposed to specify behavior-level applications more efficiently than conventional message-passing programming model does. To alleviate the complexity in parallel programming, BTS has the computation tasks implemented as sequential modules with data shared among them. Also parameterization was proposed in BTS to produce pseudo messages pointing to the shared data, and to fulfill data-driven scheduling. As substitute for the conventional parallel applications, BTS-based ones inherit their computation-models and the underlying scheduling schemes. The pseudo messages are consistent with those in the ancestors in function and size. Then BTS-based applications and conventional ones will produce identical traffic and identical results for NoC simulation. Case studies showed that BTS may boost the application specification by reusing the existing sequential codes, especially domain-specific languages implemented as libraries of sequential sub-routines.

关键词： Network-on-a-chip Computational modeling Traffic control Application software Processor scheduling Computer architecture Computer networks Telecommunication traffic parallel programming Concurrent computing

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Performance efficiency of context-flow system-on-chip platform 03

Performance efficiency of context-flow system-on-chip platfo...

引用

IEEE International Conference on Computer-Aided Design

作者： R. Beidas Jianwen Zhu Electrical and Computer Engineering University of Toronto ONT Canada

ISBN: (纸本)9781581137620

Recent efforts in adapting computer networks into system-on-chip (SOC), or network-on-chip, present a setback to the traditional computer systems for the lack of effective programming model, while not taking full advantage of the almost unlimited on-chip bandwidth. In this paper, we propose a new programming model, called context-flow, that is simple, safe, highly parallelizable yet transparent to the underlying architectural details. An SOC platform architecture is then designed to support this programming model, while fully exploiting the physical proximity between the processing elements. We demonstrate the performance efficiency of this architecture over bus based and packet-switch based networks by two case studies using a multi-processor architecture simulator.

关键词： System-on-a-chip Network-on-a-chip parallel programming Context modeling Computer architecture Computer networks Bandwidth Data structures Process design Application software

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Object oriented Fortran for development of portable parallel programs

Object oriented Fortran for development of portable parallel...

引用

International Symposium on parallel and Distributed Processing (IPDPS)

作者： D.S. Reese E. Luke Mississippi State University NSF ERC for Computational Field Simulation

parallel programming has to date remained inaccessible to the average scientific programmer. parallel programming languages are generally foreign to most scientific applications programmers who only speak Fortran. Automatic parallelization techniques have so far proved unsuccessful in extracting large amounts of parallelism from sequential codes and do not encourage development of new, inherently parallel algorithms. In addition, there is a lack of consistency of programmer interface across architectures which requires programmers to invest a lot of effort in porting code from one parallel machine to another. This paper discusses the object oriented Fortran language and support routines developed at Mississippi State in support of parallelizing complex field simulations. This interface is based on Fortran to ease its acceptance by scientific programmers and is implemented on top of the Unix operating system for portability.< >

关键词： parallel programming programming profession parallel processing Concurrent computing Computational modeling Object oriented modeling Memory architecture Portable computers Natural languages Application specific integrated circuits

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