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

共 560 条记录，以下是171-180 订阅

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Tiles: A new language mechanism for heterogeneous parallelism 2015

Tiles: A new language mechanism for heterogeneous parallelis...

引用

20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Chen, Yifeng Cui, Xiang Mei, Hong HCST Key Lab. School of EECS Peking University Beijing100871 China

ISBN: (纸本)9781450332057

This paper studies the essence of heterogeneity from the perspective of language mechanism design. The proposed mechanism, called tiles, is a program construct that bridges two relative levels of computation: an outer level of source data in larger, slower or more distributed memory and an inner level of data blocks in smaller, faster or more localized memory.

关键词： parallel programming

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An OpenACC-based unified programming model for multi-accelerator systems 2015

An OpenACC-based unified programming model for multi-acceler...

引用

20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Kim, Jungwon Lee, Seyong Vetter, Jeffrey S. Oak Ridge National Laboratory United States Georgia Institute of Technology United States

ISBN: (纸本)9781450332057

This paper proposes a novel SPMD programming model of OpenACC. Our model integrates the different granularities of parallelism from vector-level parallelism to node-level parallelism into a single, unified model based on OpenACC. It allows programmers to write programs for multiple accelerators using a uniform programming model whether they are in shared or distributed memory systems. We implement a prototype of our model and evaluate its performance with a GPU-based supercomputer using three benchmark applications.

关键词： Supercomputers

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The lock-free k-LSM relaxed priority queue 2015

The lock-free k-LSM relaxed priority queue

引用

20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Wimmer, Martin Gruber, Jakob Träff, Jesper Larsson Tsigas, Philippas Faculty of Informatics Parallel Computing Vienna University of Technology Vienna/Wien1040 Austria Computer Science and Engineering Chalmers University of Technology Göteborg412 96 Sweden

ISBN: (纸本)9781450332057

We present a new, concurrent, lock-free priority queue that relaxes the delete-min operation to allow deletion of any of the ρ+1 smallest keys instead of only a minimal one, where ρ is a parameter that can be configured at runtime. It is built from a logarithmic number of sorted arrays, similar to log-structured merge-trees (LSM). For keys added and removed by the same thread the behavior is identical to a non-relaxed priority queue. We compare to state-of-the-art lock-free priority queues with both relaxed and non-relaxed semantics, showing high performance and good scalability of our approach.

关键词： parallel programming

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A library for portable and composable data locality optimizations for NUMA systems 2015

A library for portable and composable data locality optimiza...

引用

20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Majo, Zoltan Gross, Thomas R. Department of Computer Science ETH Zurich Switzerland

ISBN: (纸本)9781450332057

Many recent multiprocessor systems are realized with a nonuniform memory architecture (NUMA) and accesses to remote memory locations take more time than local memory accesses. Optimizing NUMA memory system performance is difficult and costly for three principal reasons: (1) today's programming languages/libraries have no explicit support for NUMA systems, (2) NUMA optimizations are not portable, and (3) optimizations are not composable (i.e., they can become ineffective or worsen performance in environments that support composable parallel software). This paper presents TBB-NUMA, a parallel programming library based on Intel Threading Building Blocks (TBB) that supports portable and composable NUMA-aware programming. TBB-NUMA provides a model of task affinity that captures a programmer's insights on mapping tasks to resources. NUMA-awareness affects all layers of the library (i.e., resource management, task scheduling, and high-level parallel algorithm templates) and requires close coupling between all these layers. Optimizations implemented with TBB-NUMA (for a set of standard benchmark programs) result in up to 44% performance improvement over standard TBB, but more important, optimized programs are portable across different NUMA architectures and preserve data locality also when composed with other parallel computations. Copyright 2015 acm.

关键词： parallel programming

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A collection-oriented programming model for performance portability 2015

A collection-oriented programming model for performance port...

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20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Muralidharan, Saurav Garland, Michael Catanzaro, Bryan Sidelnik, Albert Hall, Mary University of Utah Salt Lake CityUT United States NVIDIA Corporation Santa ClaraCA United States Baidu Inc. SunnyvaleCA United States

ISBN: (纸本)9781450332057

This paper describes Surge, a collection-oriented programming model that enables programmers to compose parallel computations using nested high-level data collections and operators. Surge exposes a code generation interface, decoupled from the core computation, that enables programmers and autotuners to easily generate multiple implementations of the same computation on various parallel architectures such as multi-core CPUs and GPUs. By decoupling computations from architecture-specific implementation, programmers can target multiple architectures more easily, and generate a search space that facilitates optimization and customization for specific architectures. We express in Surge four real-world benchmarks from domains such as sparse linear-algebra and machine learning and from the same performance-portable specification, generate OpenMP and CUDA C++ implementations. Surge generates efficient, scalable code which achieves up to 1.32x speedup over handcrafted, well-optimized CUDA code.

关键词： parallel architectures

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A framework for practical parallel fast matrix multiplication 2015

A framework for practical parallel fast matrix multiplicatio...

引用

20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Benson, Austin R. Ballard, Grey Institute for Computational and Mathematical Engineering Stanford University StanfordCA United States Sandia National Laboratories LivermoreCA United States

ISBN: (纸本)9781450332057

Matrix multiplication is a fundamental computation in many scientific disciplines. In this paper, we show that novel fast matrix multiplication algorithms can significantly outperform vendor implementations of the classical algorithm and Strassen's fast algorithm on modest problem sizes and shapes. Furthermore, we show that the best choice of fast algorithm depends not only on the size of the matrices but also the shape. We develop a code generation tool to automatically implement multiple sequential and shared-memory parallel variants of each fast algorithm, including our novel parallelization scheme. This allows us to rapidly benchmark over 20 fast algorithms on several problem sizes. Furthermore, we discuss a number of practical implementation issues for these algorithms on shared-memory machines that can direct further research on making fast algorithms practical. Copyright 2015 acm.

关键词： Matrix algebra

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A programming model and runtime system for significance-aware energy-efficient computing 2015

A programming model and runtime system for significance-awar...

引用

20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Vassiliadis, Vassilis Parasyris, Konstantinos Chalios, Charalambos Antonopoulos, Christos D. Lalis, Spyros Bellas, Nikolaos Vandierendonck, Hans Nikolopoulos, Dimitrios S. Electrical and Computer Eng. Dept. University of Thessaly Greece Greece Queen's University Belfast United Kingdom

ISBN: (纸本)9781450332057

We introduce a task-based programming model and runtime system that exploit the observation that not all parts of a program are equally significant for the accuracy of the end-result, in order to trade off the quality of program outputs for increased energy-efficiency. This is done in a structured and flexible way, allowing for easy exploitation of different points in the quality/energy space, without adversely affecting application performance. The runtime system can apply a number of different policies to decide whether it will execute less-significant tasks accurately or approximately. The experimental evaluation indicates that our system can achieve an energy reduction of up to 83% compared with a fully accurate execution and up to 35% compared with an approximate version employing loop perforation. At the same time, our approach always results in graceful quality degradation.

关键词： Energy efficiency

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Combining phase identification and statistic modeling for automated parallel benchmark generation 2015

Combining phase identification and statistic modeling for au...

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20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Jin, Ye Liu, Mingliang Ma, Xiaosong Liu, Qing Logan, Jeremy Podhorszki, Norbert Choi, Jong Youl Klasky, Scott NCSU United States QCRI Qatar Oak Ridge National Lab. United States

ISBN: (纸本)9781450332057

parallel application benchmarks are indispensable for evaluating/optimizing HPC software and hardware. However, it is very challenging and costly to obtain high-fidelity benchmarks reflecting the scale and complexity of state-of-the-art parallel applications. Hand-extracted synthetic benchmarks are time- and labor-intensive to create. Real applications themselves, while offering most accurate performance evaluation, are expensive to compile, port, reconfigure, and often plainly inaccessible due to security or ownership concerns. This work contributes APPRIME, a novel tool for trace-based automatic parallel benchmark generation. Taking as input standard communication-I/O traces of an application's execution, it couples accurate automatic phase identification with statistical regeneration of event parameters to create compact, portable, and to some degree reconfigurable parallel application benchmarks. Experiments with four NAS parallel Benchmarks (NPB) and three real scientific simulation codes confirm the fidelity of APPRIME benchmarks. They retain the original applications' performance characteristics, in particular the relative performance across platforms.

关键词： Benchmarking

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Barrier elision for production parallel programs 2015

Barrier elision for production parallel programs

引用

20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Chabbi, Milind Lavrijsen, Wim De Jong, Wibe Sen, Koushik Mellor-Crummey, John Iancu, Costin Rice University United States Lawrence Berkeley National Laboratory United States UC Berkeley United States

ISBN: (纸本)9781450332057

Large scientific code bases are often composed of several layers of runtime libraries, implemented in multiple programming languages. In such situation, programmers often choose conservative synchronization patterns leading to suboptimal performance. In this paper, we present context-sensitive dynamic optimizations that elide barriers redundant during the program execution. In our technique, we perform data race detection alongside the program to identify redundant barriers in their calling contexts;after an initial learning, we start eliding all future instances of barriers occurring in the same calling context. We present an automatic on-the-fly optimization and a multi-pass guided optimization. We apply our techniques to NWChem - a 6 million line computational chemistry code written in C/C++/Fortran that uses several runtime libraries such as Global Arrays, ComEx, DMAPP, and MPI. Our technique elides a surprisingly high fraction of barriers (as many as 63%) in production runs. This redundancy elimination translates to application speedups as high as 14% on 2048 cores. Our techniques also provided valuable insight about the application behavior, later used by NWChem developers. Overall, we demonstrate the value of holistic context-sensitive analyses that consider the domain science in conjunction with the associated runtime software stack. Copyright 2015 acm.

关键词： Computational chemistry

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A parallel algorithm for global states enumeration in concurrent systems 2015

A parallel algorithm for global states enumeration in concur...

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20th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2015

作者： Chang, Yen-Jung Garg, Vijay K. Department of Electrical and Computer Engineering University of Texas Austin United States

ISBN: (纸本)9781450332057

Verifying the correctness of the executions of a concurrent program is difficult because of its nondeterministic behavior. One of the verification methods is predicate detection, which predicts whether the user specified condition (predicate) could become true in any global states of the program. The method is predictive because it generates inferred execution paths from the observed execution path and then checks the predicate on the global states of inferred paths. One important part of predicate detection is global states enumeration, which generates the global states on inferred paths. Cooper and Marzullo gave the first enumeration algorithm based on a breadth first strategy (BFS). Later, many algorithms have been proposed to improve space and time complexity. None of them, however, takes parallelism into consideration. In this paper, we present the first parallel and online algorithm, named ParaMount, for global state enumeration. Our experimental results show that ParaMount speeds up the existing sequential algorithms by a factor of 6 with 8 threads. We have implemented an online predicate detector using ParaMount. For predicate detection, our detector based on ParaMount is 10 to 50 times faster than RV runtime (a verification tool that uses Cooper and Marzullo's BFS enumeration algorithm). Copyright 2015 acm.

关键词： parallel algorithms

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