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检索条件"任意字段=14th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming"

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PPDP'08 Proceedings of the 10th International acm sigplan symposium on principles and practice of Declarative programming

PPDP'08 Proceedings of the 10th International ACM SIGPLAN Sy...

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PPDP 2008: 10th International acm sigplan symposium on principles and practice of Declarative programming

ISBN: (纸本)9781605581170

the proceedings contain 25 papers. the topics discussed include: order-sorted dependency pairs;macros for context-free grammars;inferring precise polymorphic type dependencies in logic programs;a type system for safe memory management and its proof of correctness;programming with proofs and explicit contexts;towards execution time estimation in abstract machine-based languages;similarity-based reasoning in qualified logic programming;classifying integrity checking methods with regard to inconsistency tolerance;comprehending finite maps for algorithmic debugging of higher-order functional programs;parallel execution of multi-set constraint rewrite rules;a rewriting framework for the composition of access control policies;global difference constraint propagation for finite domain solvers;and dynamic variable elimination during propagation solving.

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A framework for practical parallel fast matrix multiplication 2015

A framework for practical parallel fast matrix multiplicatio...

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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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Improving parallel shear-warp volume rendering on shared address space multiprocessors 97

Improving parallel shear-warp volume rendering on shared add...

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Proceedings of the 1997 6th acm sigplan symposium on principles and practice of parallel programming

作者： Jiang, Dongming Singh, Jaswinder Pal Princeton Univ Princeton NJ United States

ISBN: (纸本)9780897919067

this paper presents a new parallel volume rendering algorithm and implementation, based on shear warp factorization, for shared address space multiprocessors. Starting from an existing parallel shear-warp renderer, we use increasingly detailed performance measurements on real machines and simulators to understand performance bottlenecks. this leads us to a new parallel implementation that substantially outperforms and out-scales the old one on a range of shared address space platforms, from bus-based centralized memory machine to hardware-coherent distributed memory machines to networks of computers connected by page-based shared virtual memory. the results demonstrate that real time volume rendering is promising on general purpose multiprocessors, and illustrate the utility of tool hierarchies in conjunction with algorithmic and application knowledge to understand memory system interactions and improve parallel algorithms.

关键词： parallel algorithms

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VEBO: A vertex- and edge-balanced ordering heuristic to load balance parallel graph processing 19

VEBO: A vertex- and edge-balanced ordering heuristic to load...

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24th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2019

作者： Sun, Jiawen Vandierendonck, Hans Nikolopoulos, Dimitrios S. Queen's University of Belfast United Kingdom

ISBN: (纸本)9781450362252

this work proposes Vertex- and Edge-Balanced Ordering (VEBO): balance the number of edges and the number of unique destinations of those edges. VEBO balances edges and vertices for graphs with a power-law degree distribution, and ensures an equal degree distribution between partitions. Experimental evaluation on three shared-memory graph processing systems (Ligra, Polymer and GraphGrind) shows that VEBO achieves excellent load balance and improves performance by 1.09× over Ligra, 1.41× over Polymer and 1.65× over GraphGrind, compared to their respective partitioning algorithms, averaged across 8 algorithms and 7 graphs. VEBO improves GraphGrind performance with a speedup of 2.9× over Ligra on average. © 2019 Copyright held by the owner/author(s).

关键词： Graph theory

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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...

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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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Architectural Support for Cilk Computations on Many-core Architectures

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acm sigplan NOTICES 2009年第4期44卷 285-286页

作者： Long, Guoping Fan, Dongrui Zhang, Junchao Chinese Acad Sci Inst Comp Technol Key Lab Comp Syst & Architecture Beijing 100864 Peoples R China

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Cilk: An efficient multithreaded runtime system

Cilk: An efficient multithreaded runtime system

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

作者： Blumofe, Robert D. Joerg, Christopher F. Kuszmaul, Bradley C. Leiserson, Charles E. Randall, Keith H. Zhou, Yuli MIT Lab for Computer Science Cambridge United States

Cilk (pronounced `silk') is a C-based runtime system for multi-threaded parallel programming. In this paper, we document the efficiency of the Cilk work-stealing scheduler, both empirically and analytically. We show that on real and synthetic applications, the `work' and `critical path' of a Cilk computation can be used to accurately model performance. Consequently, a Cilk programmer can focus on reducing the work and critical path of his computation, insulated from load balancing and other runtime scheduling issues. We also prove that for the class of `fully strict' (well-structured) programs, the Cilk scheduler achieves space, time, and communication bounds all within a constant factor of optimal. the Cilk runtime system currently runs on the Connection Machine CM5 MPP, the Intel Paragon MPP, the Silicon Graphics Power Challenge SMP, and the MIT Phish network of workstations. Applications written in Cilk include protein folding, graphic rendering, backtrack search, and the Socrates chess program, which won third prize in the 1994 acm International Computer Chess Championship.

关键词： parallel processing systems

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Accelerating CUDA Graph Algorithms at Maximum Warp 11

Accelerating CUDA Graph Algorithms at Maximum Warp

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16th acm symposium on principles and practice of parallel programming

作者： Hong, Sungpack Kim, Sang Kyun Oguntebi, Tayo Olukotun, Kunle Stanford Univ Comp Syst Lab Stanford CA 94305 USA

ISBN: (纸本)9781450301190

Graphs are powerful data representations favored in many computational domains. Modern GPUs have recently shown promising results in accelerating computationally challenging graph problems but their performance suffers heavily when the graph structure is highly irregular, as most real-world graphs tend to be. In this study, we first observe that the poor performance is caused by work imbalance and is an artifact of a discrepancy between the GPU programming model and the underlying GPU architecture. We then propose a novel virtual warp-centric programming method that exposes the traits of underlying GPU architectures to users. Our method significantly improves the performance of applications with heavily imbalanced workloads, and enables trade-offs between workload imbalance and ALU underutilization for fine-tuning the performance. Our evaluation reveals that our method exhibits up to 9x speedup over previous GPU algorithms and 12x over single thread CPU execution on irregular graphs. When properly configured, it also yields up to 30% improvement over previous GPU algorithms on regular graphs. In addition to performance gains on graph algorithms, our programming method achieves 1.3x to 15.1x speedup on a set of GPU benchmark applications. Our study also confirms that the performance gap between GPUs and other multi-threaded CPU graph implementations is primarily due to the large difference in memory bandwidth.

关键词： Algorithms Performance parallel graph algorithms CUDA GPGPU

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Barrier elision for production parallel programs 2015

Barrier elision for production parallel programs

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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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Efficient deterministic multithreading without global barriers 14

Efficient deterministic multithreading without global barrie...

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Proceedings of the 19th acm sigplan symposium on principles and practice of parallel programming

作者： Lu, Kai Zhou, Xu Bergan, Tom Wang, Xiaoping Science and Technology on Parallel and Distributed Processing Laboratory National University of Defense Technology Changsha China College of Computer National University of Defense Technology Changsha China University of Washington Computer Science and Engineering United States

ISBN: (纸本)9781450326568

Multithreaded programs execute nondeterministically on conventional architectures and operating systems. this complicates many tasks, including debugging and testing. Deterministic multithreading (DMT) makes the output of a multithreaded program depend on its inputs only, which can totally solve the above problem. However, current DMT implementations suffer from a common inefficiency: they use frequent global barriers to enforce a deterministic ordering on memory accesses. In this paper, we eliminate that inefficiency using an execution model we call deterministic lazy release consistency (DLRC). Our execution model uses the Kendo algorithm to enforce a deterministic ordering on synchronization, and it uses a deterministic version of the lazy release consistency memory model to propagate memory updates across threads. Our approach guarantees that programs execute deterministically even when they contain data races. We implemented a DMT system based on these ideas (RFDet) and evaluated it using 17 parallel applications. Our implementation targets C/C++ programs that use POSIX threads. Results show that RFDet gains nearly 2x speedup compared with Dthreads-a start-of-the-art DMT system. Copyright © 2014 acm.

关键词： C++ (programming language)

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