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programming with communicating nondeterministic logic objects

Programming with communicating nondeterministic logic object...

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international symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： Man-Lai Tse Wing-Hang Wong Ho-Fung Leung Department of Computer Science and Engineering Chinese University of Hong Kong Sha Tin Hong Kong China

ISBN: (纸本)0818674601

Object-oriented logic programming (OOLP) is a hybrid of object-orientation and logic programming paradigms. In this paper, we present a new object-oriented logic programming language P&P. P&P supports programming with communicating nondeterministic objects and stream parallelism for communication among objects. Intuitively, each object has a Parlog 'shell' with Prolog 'contents'. One concern in our design is to integrate Prolog's backtracking, sequential search with Parlog's concurrent execution. Hence P&P supports committed inter-object message passing via the Parlog 'shell' of the objects. Also, object-oriented features are added to provide encapsulation and code reuse.

关键词： Logic programming Concurrent computing Computer science Natural languages Message passing Encapsulation parallel processing Logic design Real time systems Prototypes

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Practical parallel algorithms for dynamic data redistribution, median finding, and selection

Practical parallel algorithms for dynamic data redistributio...

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Proceedings of the 1996 10th international parallel Processing symposium

作者： Bader, David A. JaJa, Joseph Univ of Maryland College Park United States

A common statistical problem is that of finding the median element in a set of data. This paper presents a fast and portable parallel algorithm for finding the median given a set of elements distributed across a parallel machine. In fact, our algorithm solves the general selection problem that requires the determination of the element of rank i, for an arbitrarily given integer i. Practical algorithms needed by our selection algorithm for the dynamic redistribution of data are also discussed. Our general framework is a distributed memory programming model enhanced by a set of communication primitives. We use efficient techniques for distributing, coalescing, and load balancing data as well as efficient combinations of task and data parallelism. The algorithms have been coded in Split-C and run on a variety of platforms, including the Thinking Machines CM-5, IBM SP-1 and SP-2, Cray Research T3D, Meiko Scientific CS-2, Intel Paragon, and workstation clusters. Our experimental results illustrate the scalability and efficiency of our algorithms across different platforms and improve upon all the related experimental results known to the authors.

关键词： parallel algorithms

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programming with transactions and chemical abstract machine

Programming with transactions and chemical abstract machine

引用

international symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： Wanli Ma C.W. Johnson R.P. Brent Computer Science Lab Australian National University Canberra ACT Australia Department of Computer Science Australian National University Canberra ACT Australia

The coordination style programming language T-Cham extends chemical abstract machine (Cham) with transactions. The Cham is an interactive computational model based on chemical reaction metaphor, where a computation proceeds as a succession of chemical reactions. A transaction is a piece of sequentially executed codes and could be written in any language, such as C, Pascal, or Fortran etc., as long as it satisfies its pre-condition and post-condition. Every transaction begins its execution whenever its execution condition is satisfied. A T-Cham program can be executed in a parallel, distributed, or sequential manner based on the available computer resources.

关键词： Computer languages Concurrent computing Yarn Computational modeling Chemical elements Distributed computing Communication system control Australia parallel programming programming profession

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A method that determines optimal grain size and inherent parallelism concurrently

A method that determines optimal grain size and inherent par...

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international symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： Yiqun Ge D.Y.Y. Yun Laboratories of Intelligent and Parallel Systems (LIPS) Department of Electrical Engineering University of Hawaii Manoa Honolulu HI USA

Grain packing is an important problem to the development of efficient parallel programs. It is desirable that the grain packing can be performed automatically, so that the programmer can write parallel programs without being troubled by the details of parallel-programming languages and parallel architectures, and the same parallel program can be executed efficiently on different machines. This paper presents a 2D Compression (2DC) grain packing method for determining optimal grain size and inherent parallelism concurrently. This ability is mainly due to 2DC's continuing efforts for achieving conflicting objectives. Experimental results demonstrate that 2DC increases the solution effectiveness, in comparison with state-of-art approaches that aim at economizing either speedup or resource utilization. Additionally, 2DC can determine inherent parallelism, which means that users will no longer be required to specify the number of processors before the compilation stage.

关键词： Grain size parallel processing programming profession parallel architectures Concurrent computing Resource management parallel programming Laboratories Intelligent systems Lips

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A critical look at three of parallel computing's maxims

A critical look at three of parallel computing's maxims

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international symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： B.M. Maggs School of Computer Science Carnegie Mellon University Pittsburgh PA USA

The last few years have seen the introduction of a large number of parallel computers, as well as the failures of several manufacturers. As the machines have been released, they have been thoroughly evaluated, and a wide range of benchmark data is now available. Furthermore, in this time our expertise in programming and extracting performance from parallel machines has greatly increased, a theory of parallel and network algorithms has developed, and our understanding of the modeling process has improved. Hence, now seems a propitious time to take a critical look at our maxims. This paper takes a critical look at the following three maxims: parallel architecture is converging on a design based on commodity microprocessor chips; wormhole routing is decidedly more efficient than store-and-forward routing; and the PRAM is an unrealistically ideal model of computation.

关键词： parallel processing Computer aided manufacturing Concurrent computing Routing parallel programming Data mining parallel machines parallel architectures Microprocessor chips Phase change random access memory

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Tuning parallel program through automatic program analysis

Tuning parallel program through automatic program analysis

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international symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： K.C. Li K. Zhang Department of Computing School of MPCE Macquarie University Sydney NSW Australia

Many current performance analysis systems offer little more than basic measurement and analysis facilities for locating the sources of poor performance, such as load imbalance, communication overhead and synchronization loss. We believe that this is only part of the solution and a system which can provide higher level performance measurement and analysis is highly desirable. In this paper, we describe a new approach to designing performance tuning tools for parallel processing systems. A primary contribution of this work is to explore the way in which the strategies and algorithms used in parallel programs contribute to the poor performance. In order to detect the strategies and algorithms used in parallel programs, a technique called Automatic Program Analysis is used. Our goal is to provide users with higher level performance advices. We present a case study describing how a prototype implementation of our technique was able to identify the performance problem and provide tuning advice.

关键词： Performance analysis programming profession Current measurement Loss measurement Performance loss Prototypes parallel programming Data analysis Data visualization Search problems

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The MULTIPLUS/MULPLIX parallel processing environment

The MULTIPLUS/MULPLIX parallel processing environment

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international symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： J.S. Aude A.M. Meslin C.M.P. Santos G. Bronstein L.F.M. Cordeiro M.O. Barros M. Joao S.C. Oliveira NCE/UFRJ Federal University of Rio de Janeiro Rio de Janeiro Rio de Janeiro Brazil NCE/UFRJ Federal Univ. of Rio de Janeiro Brazil

The MULTIPLUS project aims at the development of a modular parallel architecture suitable for the study of several aspects of parallelism in both true shared memory and virtual shared memory environments. The MULTIPLUS architecture is able to support up to 1024 Processing Elements based on SPARC microprocessors. The MULPLIX Unix-like operating system offers a suitable parallel programming environment for the MULTIPLUS architecture by providing facilities for the creation of threads, the allocation of private and shared memory space and the efficient use of synchronization primitives. After presenting the main features of the MULTIPLUS architecture and of the MULPLIX operating system, the paper describes in detail the design and the implementation of the three MULTIPLUS architecture basic hardware modules: the Processing Element, the Multistage Interconnection Network and the I/O Processor. In addition, the definition of the MULPLIX parallel programming primitives is discussed and their use is illustrated through an example. Finally, future directions in the development of the MULTIPLUS research project are commented.

关键词： parallel processing Computer architecture Operating systems parallel programming Multiprocessor interconnection networks Concurrent computing parallel architectures Microprocessors Yarn Hardware

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Automatic software generation in the OORHS distributed computing framework

Automatic software generation in the OORHS distributed compu...

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international symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： D.S. Yeung A.K.Y. Wong Department of Computing Hong Kong Polytechnic University Hong Kong China

Software generation in the OORHS (object-oriented reciprocative hypercomputing system) is user-transparent. It addresses the issue of ease of use by minimizing the number of steps leading to a programming solution. The OORHS requires from the user only a high level APPL program, which is, in effect, a specification. For every APPL program, the system automatically performs all the necessary distributed computing steps. The precompiler, based on the object-oriented paradigm, instantiates the encapsulated program objects embedded in an APPL program. These program objects are distributed at the source level. They are compiled and then executed at the allocated sites. This unique approach, known as local compilation, eliminates the need to store the compilers used by other machines locally. It enhances the compatibility between the compiled program and the host processor. The precompiler generates a program objects dictionary for every APPL program. The contents in the dictionary facilitates program visualization.

关键词： Distributed computing Dictionaries Software libraries Load management parallel programming Visualization Embryo Fault tolerance Global communication parallel processing

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Optimizing communication for array operations on message-passing multicomputers

Optimizing communication for array operations on message-pas...

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international symposium on parallel architectures, algorithms and Networks (ISPAN)

作者： A. Eberhart Jingke Li Department of Computer Science Portland State University Portland OR USA

Whole array operations and array section operations are important features of many data-parallel languages. Efficient implementation of these operations on distributed-memory multicomputers is critical to the scalability and high-performance of data-parallel programs. We present an approach for analyzing communication patterns induced by array operations and for scheduling message flow based on the information. Our scheduling algorithm guarantees contention-free data transfer and utilizes network resources optimally. It incurs little overhead and is suitable to be used in compilers and in runtime libraries. We also present simulation results that demonstrate the algorithm's superiority to the asynchronous transfer mode that is commonly used for this type of communication.

关键词： Scheduling algorithm Pattern analysis Runtime library Computer science Scalability Information analysis Asynchronous transfer mode parallel processing parallel algorithms programming profession

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parallel break construct, or how to kill an activity tree

Parallel break construct, or how to kill an activity tree

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Proceedings of the 1996 10th international parallel Processing symposium

作者： Friedman, Yair I. Feitelson, Dror G. Exman, Iaakov Hebrew Univ Jerusalem Israel

Most parallel languages provide means to express parallelism, e.g. a parallel-do construct, but no means to terminate the parallel activities spawned by such constructs. We propose three high-level primitives for this purpose, which are defined by analogies with primitives that break out of sequential iterative constructs. The primitives are pcontinue, which terminates the calling activity, pbreak, which terminates all the activities in the construct that spawned the calling activity, and return, which terminates all the activities created in the current function call. These constructs are especially useful in search problems, where an activity that finds a solution can terminate other activities that are investigating inferior approaches. Given that parallel constructs can be nested, activities form a tree rooted at the original activity that started the program. The main challenge in implementing pbreak and return is identifying the subtree of activities that should be killed. Three algorithms were designed and implemented, and experiments show that using these constructs can provide significant performance benefits.

关键词： C (programming language)

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