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检索条件"任意字段=2003 ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming"

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Space and time efficient execution of parallel irregular computations 97

Space and time efficient execution of parallel irregular com...

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Proceedings of the sixth acm sigplan symposium on principles and practice of parallel programming

作者： Cong Fu Tao Yang Department of Computer Science University of California Santa Barbara CA

ISBN: (纸本)9780897919067

Solving problems of large sizes is an important goal for parallel machines with multiple CPU and memory resources. In this paper, issues of efficient execution of overhead-sensitive parallel irregular computation under memory constraints are addressed. The irregular parallelism is modeled by task dependence graphs with mixed granularities. The trade-off in achieving both time and space efficiency is investigated. The main difficulty of designing efficient run-time system support is caused by the use of fast communication primitives available on modern parallel architectures. A run-time active memory management scheme and new scheduling techniques are proposed to improve memory utilization while retaining good time efficiency, and a theoretical analysis on correctness and performance is provided. This work is implemented in the context of RAPID system [5] which provides run-time support for parallelizing irregular code on distributed memory machines and the effectiveness of the proposed techniques is verified on sparse Cholesky and LU factorization with partial pivoting. The experimental results on Cray-T3D show that solvable problem sizes can be increased substantially under limited memory capacities and the loss of execution efficiency caused by the extra memory managing overhead is reasonable.

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Dynamic pointer alignment: tiling and communication optimizations for parallel pointer-based computations 97

Dynamic pointer alignment: tiling and communication optimiza...

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Proceedings of the sixth acm sigplan symposium on principles and practice of parallel programming

作者： Xingbin Zhang Andrew A. Chien Department of Computer Science University of Illinois at Urbana-Champaign Department of Computer Science University of Illinois at Urbana-Champaign and Hewlett Packard Laboratories

ISBN: (纸本)9780897919067

Loop tiling and communication optimization, such as message pipelining and aggregation, can achieve optimized and robust memory performance by proactively managing storage and data movement. In this paper, we generalize these techniques to pointer-based data structures (PBDSs). Our approach, dynamic pointer alignment (DPA), has two components. The compiler decomposes a program into non-blocking threads that operate on specific pointers and labels thread creation sites with their corresponding pointers. At runtime, an explicit mapping from pointers to dependent threads is updated at thread creation and is used to dynamically schedule both threads and communication, such that threads using the same objects execute together, communication overlaps with local work, and messages are aggregated. We have implemented DPA to optimize remote reads to global PBDSs on parallel machines. Our empirical results on the force computation phases of two applications that use sophisticated PBDSs, Barnes-Hut and FMM, show that DPA achieves good absolute performance and speedups by enabling tiling and communication optimization on the CRAY T3D.

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An effective garbage collection strategy for parallel programming languages on large scale distributed-memory machines 97

An effective garbage collection strategy for parallel progra...

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Proceedings of the sixth acm sigplan symposium on principles and practice of parallel programming

作者： Kenjiro Taura Akinori Yonezawa Department of Information Science Faculty of Science University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113 Japan

ISBN: (纸本)9780897919067

This paper describes the design and implementation of a garbage collection scheme on large-scale distributed-memory computers and reports various experimental results. The collector is based on the conservative GC library by Boehm & Weiser. Each processor traces local pointers using the GC library while traversing remote pointers by exchanging "mark messages" between processors. It exhibits a promising performance---in the most space-intensive settings we tested, the total collection overhead ranges from 5% up to 15% of the application running time (excluding idle time). We not only examine basic performance figures such as the total overhead or latency of a global collection, but also demonstrate how local collection scheduling strategies affect application performance. In our collector, a local collection is scheduled either independently or synchronously. Experimental results show that the benefit of independent local collections has been overstated in the literature. Independent local collections slowed down application performance to 40%, by increasing the average communication latency. Synchronized local collections exhibit much more robust performance characteristics than independent local collections and the overhead for global synchronization is not significant. Furthermore, we show that an adaptive collection scheduler can select the appropriate local collection strategy based on the application's behavior. The collector has been used in a concurrent object-oriented language ABCL/f and the performance is measured on a large-scale parallel computer (256 processors) using four non-trivial applications written in ABCL/f.

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Proceedings of the 5th acm sigplan symposium on principles and practice of parallel programming

Proceedings of the 5th ACM SIGPLAN Symposium on Principles a...

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Proceedings of the 5th acm sigplan symposium on principles and practice of parallel programming

The proceedings contains 21 papers from the Fifth acm sigplan symposium on principles & practice of parallel programming PPOPP. Topics discussed include data parallel programs;data libraries;data caches;data acces... 详细信息

关键词： parallel processing systems

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AUTOMATIC ALIGNMENT OF ARRAY DATA AND PROCESSES TO REDUCE COMMUNICATION TIME ON DMPPS 95

AUTOMATIC ALIGNMENT OF ARRAY DATA AND PROCESSES TO REDUCE CO...

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5th acm sigplan symposium on principles and practice of parallel programming

作者： PHILIPPSEN, M ICSI International Computer Science Institute Berkeley CA and Dept. of Informatics University of Karlsruhe

ISBN: (纸本)9780897917001

This paper investigates the problem of aligning array data and processes in a distributed-memory implementation. We present complete algorithms for compile-time analysis, the necessary program restructuring, and subsequent code-generation, and discuss their complexity. We finally evaluate the practical usefulness by quantitative experiments. The technique presented analyzes complete programs, including branches, loops, and nested parallelism. Alignment is determined with respect to offset, stride, and general ass's relations. Pplacement of both data and processes are computed in a unifying framework based on an extended preference graph and its analysis. Dynamic redistributions are derived. The experimental results are very encouraging. The optimization algorithms implemented in our Modula-2* compiler improved the execution times of the programs by an average over 40% on a MasPar MP-1 with 16384 processors.

关键词： parallel processing systems

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Model and compilation strategy for out-of-core data parallel programs

Model and compilation strategy for out-of-core data parallel...

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Proceedings of the 5th acm sigplan symposium on principles and practice of parallel programming

作者： Bordawekar, Rajesh Choudhary, Alok Kennedy, Ken Koelbel, Charles Paleczny, Michael Syracuse Univ Syracuse United States

It is widely acknowledged in high-performance computing circles that parallel input/output needs substantial improvement in order to make scalable computers truly usable. We present a data storage model that allows processors independent access to their own data and a corresponding compilation strategy that integrates data-parallel computation with data distribution for out-of-core problems. Our results compare several communication methods and I/O optimizations using two out-of-core problems, Jacobi iteration and LU factorization.

关键词： parallel processing systems

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GENERATING parallel CODE FROM OBJECT-ORIENTED MATHEMATICAL-MODELS

GENERATING PARALLEL CODE FROM OBJECT-ORIENTED MATHEMATICAL-M...

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5th acm sigplan symposium on principles and practice of parallel programming

作者： ANDERSSON, N FRITZSON, P Linkoping Univ Linkoping Sweden

For a long time efficient use of parallel computers has been hindered by dependencies introduced in software through low-level implementation practice. In this paper we present a programming environment and language called Object-Math (Object oriented Mathematical language for scientific computing), which aims at eliminating this problem by allowing the user to represent mathematical equation-based models directly in the system. The system performs analysis of mathematical models to extract parallelism and automatically generates parallel code for numerical solution. In the context of industrial applications in mechanical analysis, we have so far primarily explored generation of parallel code for solving systems of ordinary differential equations (ODEs), in addition to preliminary work on generating code for solving partial differential equations. Two approaches to extracting parallelism have been implemented and evaluated: extracting parallelism at the equation system level and at the single equation level, respectively. We found that for several applications the corresponding systems of equations do not partition well into subsystems. This means that the equation system level approach is of restricted general applicability. Thus, we focused on the equation-level approach which yielded significant parallelism for ODE systems solution. For the bearing simulation applications we present here, the achieved speedup is however critically dependent on low communication latency of the parallel computer.

关键词： parallel processing systems

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parallel skeletons for structured composition

Parallel skeletons for structured composition

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Proceedings of the 5th acm sigplan symposium on principles and practice of parallel programming

作者： Darlington, John Guo, Yi-ke To, Hing Wing Yang, Jin Imperial Coll London United Kingdom

In this paper, we propose a straightforward solution to the problems of compositional parallel programming by using skeletons as the uniform mechanism for structured composition. In our approach parallel programs are constructed by composing procedures in a conventional base language using a set of high-level, predefined, functional, parallel computational forms known as skeletons. The ability to compose skeletons provides us with the essential tools for building further and more complex application-oriented skeletons specifying important aspects of parallel computation. Compared with the process network based composition approach, such as PCN, the skeleton approach abstracts away the fine details of connecting communication ports to the higher level mechanism of making data distributions conform, thus avoiding the complexity of using lower level ports as the means of interaction. Thus, the framework provides a natural integration of the compositional programming approach with the data parallel programming paradigm.

关键词： parallel processing systems

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Linear-time algorithm for computing the memory access sequence in data-parallel programs

Linear-time algorithm for computing the memory access sequen...

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Proceedings of the 5th acm sigplan symposium on principles and practice of parallel programming

作者： Kennedy, Ken Nedeljkovic, Nenad Sethi, Ajay Rice Univ Houston United States

Data-parallel languages, such as High Performance Fortran, are widely regarded as a promising means for writing portable programs for distributed-memory machines. Novel features of these languages call for the development of new techniques in both compilers and run-time systems. In this paper, we present an improved algorithm for finding the local memory access sequence in computations involving regular sections of arrays with cyclic(k) distributions. After establishing the fact that regular section indices correspond to elements of an integer lattice, we show how to find a lattice basis that allows for simple and fast enumeration of memory accesses. The complexity of our algorithm is shown to be lower than that of the previous solution for the same problem. In addition, the experimental results demonstrate the efficiency of our method in practice.

关键词： parallel algorithms

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OPTIMAL MAPPING OF SEQUENCES OF DATA-parallel TASKS 95

OPTIMAL MAPPING OF SEQUENCES OF DATA-PARALLEL TASKS

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5th acm sigplan symposium on principles and practice of parallel programming

作者： SUBHLOK, J VONDRAN, G HEWLETT PACKARD CORP ADV LASER JET OPERAT BOISE ID 83714 USA

ISBN: (纸本)9780897917001

Many applications in a variety of domains including digital signal processing, image processing, and computer vision are composed of a sequence of tasks that act on a stream of input data sets in a pipelined manner. Recent research has established that these applications are best mapped to a massively parallel machine by dividing the tasks into modules and assigning a subset of the available processors to each module. This paper addresses the problem of optimally mapping such applications onto a massively parallel machine. We formulate the problem of optimizing throughput in task pipelines and present two new solution algorithms. The formulation uses a general and realistic model for inter-task communication, takes memory constraints into account, and addresses the entire problem of mapping which includes clustering tasks into modules, assignment of processors to modules, and possible replication of modules. The first algorithm is based on dynamic programming and finds the optimal mapping of k tasks onto P processors in O(P(4)k(2)) time. We also present a heuristic algorithm that is linear in the number of processors and establish with theoretical and practical results that the solutions obtained are optimal in practical situations. The entire framework is implemented as an automatic mapping tool for the Fx parallelizing compiler for High Performance Fortran. We present experimental results that demonstrate the importance of choosing a good mapping and show that the methods presented yield efficient mappings and predict optimal performance accurately.

关键词： parallel processing systems

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