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IEEE international Workshop/symposium on Workload Characterization

作者： M.R. de Alba D.R. Kaeli Department of Electrical and Computer Engineering Northeastern University Boston MA USA

ISBN: (纸本)0780373154

To obtain the benefits of aggressive, wide-issue, architectures, a large window of valid instructions must be available. While researchers have been successful in obtaining high accuracies with a range of dynamic branch predictors, there still remains the need for more aggressive instruction delivery. Loop bodies possess a large amount of spatial and temporal locality. A large percentage of a program's entire execution can be attributed to code found in loop bodies. If we retain this code in a buffer or the cache, we do not have to refetch this code on subsequent loop iterations., Loops tend to iterate multiple times before exiting, thus providing us with the opportunity to speculatively issue multiple iterations. While some loops can be unrolled by a compiler many contain conditional branches. The number of times a loop iterates may be dependent on a program variable. These issues can hinder our ability to speculatively issue multiple iterations of a loop. If we are able to profile loops during runtime, we can use this information to more accurately issue speculative paths through loop bodies. In this paper we present a characterization of loop execution across the SPECint2000 benchmark suite. We intend for this study to serve as a guide in the selection of design parameters of a loop path predictor We characterize the patterns exhibited during multiple visits to a loop body. We present the design of a table that records path-based loop execution history and allows us to predict multiple loop iterations dynamically.

关键词： Runtime Dynamic range History Computer aided instruction Computer architecture programming profession Iterative algorithms parallel processing Terminology

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Portable runtime support for graph-oriented parallel and distributed programming 5

Portable runtime support for graph-oriented parallel and dis...

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5th international symposium on parallel architectures, algorithms and Networks (I-SPAN 2000)

作者： Cao, J Liu, Y Xie, L Mao, B Zhang, K Nanjing Univ Natl Key Lab Novel Software Technol Nanjing 21008 Peoples R China

ISBN: (纸本)0769509363

In this paper, we describe the design and implementation of a portable run-time system for GOP, a graph-oriented programming framework aiming at providing high-level abstractions for configuring and programming cooperative parallel processes. The runtime system provides an interface with a library of programming primitives to the low-level facilities required to support graph-oriented communications and synchronization. The implementation is on top of the parallel Virtual Machine (PVM) in a local area network of Sun workstations. Issues related to the implementation of a graph operations in a distributed environment are discussed. Performance of the runtime system is evaluated by estimating the overheads associated with using GOP primitives as opposed to PVM.

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Proceedings - international symposium on parallel architectures, algorithms, and Networks, I-SPAN 2000

Proceedings - International Symposium on Parallel Architectu...

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5th international symposium on parallel architectures, algorithms, and Networks, I-SPAN 2000

ISBN: (纸本)0769509363

The proceedings contain 40 papers. The topics discussed include: parallel real-time computation: sometimes quantity means quality;a parallel tabu search and its hybridization with genetic algorithm;reconfigurable mesh-connected processor arrays using row-column bypassing and direct replacement;batched circuit switched routing for efficient service of requests;environment of multiprocessor simulator development;portable runtime support for graph-oriented parallel and distributed programming;comprehensive evaluation of an instruction reissue mechanism;an accurate analysis of reliability parameters in meshes with fault-tolerant adaptive routing;on the effect of link failures in fibre channel storage area networks;and an approximation algorithm for multiprocessor scheduling of trees with communication delays.

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Uintah: A massively parallel problem solving environment 9

Uintah: A massively parallel problem solving environment

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9th IEEE international symposium on High Performance Distributed Computing

作者： Germain, JDDS McCorquodale, J Parker, SG Johnson, CR Univ Utah Sci Comp & Imaging Inst Salt Lake City UT 84112 USA

ISBN: (纸本)0769507840

This paper describes Uintah, a component-based visual problem solving environment (PSE) that is designed to specifically address the unique problems of massively parallel computation, on terascale computing platforms. Uintah supports the entire life cycle of scientific applications by allowing scientific programmers to quickly and easily develop new techniques, debug new implementations, and apply known algorithms to solve novel problems. Uintah is built on three principles: 1) As much as possible, the complexities of parallel execution should be handled for the scientist, 2) software should be reusable at the component level, and 3) scientists should be able to dynamically steer and visualize their simulation results as the simulation executes. To provide this functionality, Uintah builds upon the best features of the SCIRun PSE and the DoE Common Component Architecture (CCA).

关键词： Application software Component architectures Computational modeling Concurrent computing Problem-solving programming profession Runtime Scientific computing Software reusability Visualization

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Ordering unstructured meshes for sparse matrix computations on leading parallel systems

Ordering unstructured meshes for sparse matrix computations ...

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IEEE international parallel and Distributed Processing symposium (IPDP 2000)

作者： Oliker, L Li, XY Heber, G Biswas, R Lawrence Berkeley Natl Lab NERSC Berkeley CA 94720 USA Cornell Univ Cornell Theory Ctr Ithaca NY 14853 USA NASA Ames Res Ctr MRJ Moffett Field CA 94035 USA

ISBN: (纸本)354067442X

Computer simulations of realistic applications usually require solving a set of non-linear partial differential equations (PDEs) over a finite region. The process of obtaining numerical solutions to the governing PDEs involves solving large sparse linear or eigen systems over the unstructured meshes that model the underlying physical objects. These systems are often solved iteratively, where the sparse matrix-vector multiply (SPMV) is the most expensive operation within each iteration. In this paper, we focus on the efficiency of SPMV using various ordering/partitioning algorithms. We examine different implementations using three leading programming paradigms and architectures. Results show that ordering greatly improves performance, and that cache reuse can be more important than reducing communication. However, a multithreaded implementation indicates that ordering and partitioning are not required on the Tera MTA to obtain an efficient and scalable SPMV.

关键词： Iterative methods

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Portable runtime support for graph-oriented parallel and distributed programming

Portable runtime support for graph-oriented parallel and dis...

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

作者： J. Cao Y. Liu L. Xie B. Mao K. Zhang National Key Laboratory for Novel Software Technology Nanjing University Nanjing China Department of Computing Hong Kong Polytechnic University Hong Kong China Department of Computer Science University of Texas Dallas Richardson TX USA

ISBN: (纸本)0769509363

In this paper, we describe the design and implementation of a portable run-time system for GOP, a graph-oriented programming framework aiming at providing high-bevel abstractions for configuring and programming cooperative parallel processes. The runtime system provides an interface with a library of programming primitives to the low-level facilities required to support graph-oriented communications and synchronization. The implementation is on top of the parallel Virtual Machine (PVM) in a local area network of Sun workstations. Issues related to the implementation of graph operations in a distributed environment are discussed. Performance of the runtime system is evaluated by estimating the overheads associated with using GOP primitives as opposed to PVM.

关键词： parallel programming programming profession Concurrent computing Distributed computing Runtime library Data structures Distributed control Message passing Dynamic programming Portable computers

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3rd international symposium on High Performance Computing, ISHPC 2000

3rd International Symposium on High Performance Computing, I...

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3rd international symposium on High Performance Computing, ISHPC 2000

ISBN: (纸本)9783540411284

The proceedings contain 56 papers. The special focus in this conference is on Compilers, architectures, Evaluation, algorithms, Models and Applications. The topics include: An object-based programming and execution model for processor-in-memory arrays;limits of task-based parallelism in irregular applications;the case for speculative multithreading on SMT processors;skewed data partition and alignment techniques for compiling programs on distributed memory multicomputers;processor mechanisms for software shared memory;an evaluation of page aggregation technique on different DSM systems;partitioned parallel radix sort;transonic wing shape optimization based on evolutionary algorithms;on performance modeling for HPF applications with ASL;performance sensitivity of routing algorithms to failures in networks of workstations;decentralized load balancing in multi-node broadcast schemes for hypercubes;design and implementation of an efficient thread partitioning algorithm;a flexible routing scheme for networks of workstations;java bytecode optimization with advanced instruction folding mechanism;performance evaluation of a java based chat system;on the influence of the selection function on the performance of networks of workstations;combining in-transit buffers with optimized routing schemes to boost the performance of networks with source routing;a comparison of locality-based and recency-based replacement policies;at our management comparison with related split data cache schemes sensitive to data localities;global magneto-hydrodynamic simulations of differentially rotating accretion disk by astrophysical rotational plasma simulator;exploring multi-level parallelism in cellular automata networks and functional BSP programs on enumerated vectors.

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Uintah: a massively parallel problem solving environment

Uintah: a massively parallel problem solving environment

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international symposium on High Performance Distributed Computing

作者： J. Davison de St. Germain J. McCorquodale S.G. Parker C.R. Johnson Sci. Comput. & Imaging Inst. Utah Univ. Salt Lake City UT USA Scientific Computing and Imaging Institute Salt Lake UT USA

Describes Uintah, a component-based visual problem-solving environment (PSE) that is designed to specifically address the unique problems of massively parallel computation on tera-scale computing platforms. Uintah supports the entire life-cycle of scientific applications by allowing scientific programmers to quickly and easily develop new techniques, debug new implementations and apply known algorithms to solve novel problems. Uintah is built on three principles: (1) as much as possible, the complexities of parallel execution should be handled for the scientist, (2) the software should be reusable at the component level, and (3) scientists should be able to dynamically steer and visualize their simulation results as the simulation executes. To provide this functionality, Uintah builds upon the best features of the SCIRun (Scientific Computing and Imaging Run-time) PSE and the DoE (Department of Energy) Common Component Architecture (CCA).

关键词： Problem-solving Concurrent computing Computational modeling Application software programming profession Software reusability Visualization Scientific computing Runtime Component architectures

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parallel efficiency: the dataflow advantage

Proceedings of the International Symposium on Parallel Archi...

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Proceedings of the international symposium on parallel architectures, algorithms and Networks, I-SPAN 1999年 356-361页

作者： Morris, John Univ of Western Australia Nedlands

Dataflow computation models enable simpler and more efficient management of the memory hierarchy - a key barrier to the performance of many parallel programs. This paper enumerates some advantages of using the dataflow model;it argues that the programming model is simple and easily managed by a programmer and demonstrates some of the efficiencies that the dataflow model allows an underlying run-time system to achieve.

关键词： Data flow analysis

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Java4P: Java with high-level concurrency constructs

Proceedings of the International Symposium on Parallel Archi...

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Proceedings of the international symposium on parallel architectures, algorithms and Networks, I-SPAN 1999年 328-333页

作者： Nugroho, Lukito E. Sajeev, A.S.M. Monash Univ

While Java has provided a mechanism for concurrent programming implemented as language constructs, it is too rudimentary for most programmers and has certain limitations that make programs unnecessarily complex and prevent fine-grained concurrency. We have implemented Java4P, and extension of the Java language, that offers a simpler concurrency model and overcomes Java's limitations. Threads are no longer associated with thread objects, allowing concurrency at any level of granularity. Thread creation is made implicit and syncronisation is achieve through method guards. Synchronisation specification is separated from the functional specification to provide a parallel programming model closer to sequential programming.

关键词： Java programming language

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