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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161-170 订阅

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Evaluating Graph Coloring on GPUs 11

Evaluating Graph Coloring on GPUs

引用

16th acm symposium on principles and practice of parallel programming

作者： Grosset, A. V. Pascal Zhu, Peihong Liu, Shusen Venkatasubramanian, Suresh Hall, Mary Univ Utah Sch Comp Salt Lake City UT 84112 USA

ISBN: (纸本)9781450301190

This paper evaluates features of graph coloring algorithms implemented on graphics processing units (GPUs), comparing coloring heuristics and thread decompositions. As compared to prior work on graph coloring for other parallel architectures, we find that the large number of cores and relatively high global memory bandwidth of a GPU lead to different strategies for the parallel implementation. Specifically, we find that a simple uniform block partitioning is very effective on GPUs and our parallel coloring heuristics lead to the same or fewer colors than prior approaches for distributed-memory cluster architecture. Our algorithm resolves many coloring conflicts across partitioned blocks on the GPU by iterating through the coloring process, before returning to the CPU to resolve remaining conflicts. With this approach we get as few color (if not fewer) than the best sequential graph coloring algorithm and performance is close to the fastest sequential graph coloring algorithms which have poor color quality.

关键词： Algorithms Performance Graph coloring parallel algorithm GPU CUDA

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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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Simplifying low-level GPU programming with GAS 21

Simplifying low-level GPU programming with GAS

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26th acm sigplan symposium on principles and practice of parallel programming, PPoPP 2021

作者： Yan, Da Wang, Wei Chu, Xiaowen Hkust Hong Kong Hong Kong Baptist University Hong Kong

ISBN: (纸本)9781450382946

Many low-level optimizations for NVIDIA GPU can only be implemented in native hardware assembly (SASS). However, programming in SASS is unproductive and not portable. To simplify low-level GPU programming, we present GAS (Gpu ASsembly), a PTX-like language that provides a stable instruction set across hardware architectures while giving programmers a low-level control of code execution. We demonstrate that GAS can be used with ease for low-level benchmarking and performance tuning in the context of Tensor Core HGEMM. © 2021 Owner/Author.

关键词： Graphics processing unit

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Analysis of event synchronization in a parallel programming tool 90

Analysis of event synchronization in a parallel programming ...

引用

2nd acm sigplan symposium on principles and practice of parallel programming, PPOPP 1990

作者： Callahan, David Kennedy, Ken Subhlok, Jaspal Tera Computer Company 400 North 34th Street SeattleWA98103 United States Department of Computer Science Rice University HoustonTX77251-1892 United States

ISBN: (纸本)0897913507

Understanding synchronization is important for a parallel programming tool that uses dependence analysis as the basis for advising programmers on the correctness of parallel constructs. This paper discusses static analysis methods that can be applied to parallel programs with event variable synchronization. The objective is to be able to predict potential data races in a parallel program. The focus is on how dependences and synchronization statements inside loops can be used to analyze complete programs with parallel loop and parallel case style parallelism. © 1990 acm.

关键词： Synchronization

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POSTER: LB-HM: Load Balance-Aware Data Placement on Heterogeneous Memory for Task-parallel HPC Applications 27

POSTER: LB-HM: Load Balance-Aware Data Placement on Heteroge...

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27th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Xie, Zhen Liu, Jie Ma, Sam Li, Jiajia Li, Dong Univ Calif Merced CA USA Coll William Mary Williamsburg WA USA

ISBN: (纸本)9781450392044

The emergence of heterogeneous memory (HM) provides a cost-effective and high-performance solution to memory-consuming HPC applications. However, using HM, wisely migrating data objects on it is critical for high performance. In this work, we introduce a load balance-aware page management system, named LB-HM. LB-HM introduces task semantics during memory profiling, rather than being application-agnostic. Evaluating with a set of memory-consuming HPC applications, we show that we show that LB-HM reduces existing load imbalance and leads to an average of 17.1% and 15.4% (up to 26.0% and 23.2%) performance improvement, compared with a hardware-based solution and an industry-quality software-based solution on Optane-based HM.

关键词： Semantics

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Race frontier. Reproducing data races in parallel-program debugging 91

Race frontier. Reproducing data races in parallel-program de...

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Proceedings of the Third acm sigplan symposium on principles and practice of parallel programming - PPOPP

作者： Choi, Jong-Deok Min, Sang-Lyul

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Provably and Practically Efficient Granularity Control 19

Provably and Practically Efficient Granularity Control

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24th acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Acar, Umut A. Aksenov, Vitaly Chargueraud, Arthur Rainey, Mike Carnegie Mellon Univ Pittsburgh PA 15213 USA INRIA Paris France ITMO Univ St Petersburg Russia Univ Strasbourg ICube CNRS Strasbourg France Indiana Univ Bloomington IN 47405 USA

ISBN: (纸本)9781450362252

Over the past decade, many programming languages and systems for parallel-computing have been developed, e.g., Fork/Join and Habanero Java, parallel Haskell, parallel ML, and X10. Although these systems raise the level of abstraction for writing parallel codes, performance continues to require labor-intensive optimizations for coarsening the granularity of parallel executions. In this paper, we present provably and practically efficient techniques for controlling granularity within the run-time system of the language. Our starting point is "oracle-guided scheduling", a result from the functional-programming community that shows that granularity can be controlled by an "oracle" that can predict the execution time of parallel codes. We give an algorithm for implementing such an oracle and prove that it has the desired theoretical properties under the nested-parallel programming model. We implement the oracle in C++ by extending Cilk and evaluate its practical performance. The results show that our techniques can essentially eliminate hand tuning while closely matching the performance of hand tuned codes.

关键词： parallel programming languages granularity control

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Adding Approximate Counters 16

Adding Approximate Counters

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21st acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Steele, Guy L., Jr. Tristan, Jean-Baptiste Oracle Labs Burlington MA 01803 USA

ISBN: (纸本)9781450340922

We describe a general framework for adding the values of two approximate counters to produce a new approximate counter value whose expected estimated value is equal to the sum of the expected estimated values of the given approximate counters. (To the best of our knowledge, this is the first published description of any algorithm for adding two approximate counters.) We then work out implementation details for five different kinds of approximate counter and provide optimized pseudocode. For three of them, we present proofs that the variance of a counter value produced by adding two counter values in this way is bounded, and in fact is no worse, or not much worse, than the variance of the value of a single counter to which the same total number of increment operations have been applied. Addition of approximate counters is useful in massively parallel divide-and-conquer algorithms that use a distributed representation for large arrays of counters. We describe two machine-learning algorithms for topic modeling that use millions of integer counters, and confirm that replacing the integer counters with approximate counters is effective, speeding up a GPU-based implementation by over 65% and a CPU-based by nearly 50%, as well as reducing memory requirements, without degrading their statistical effectiveness.

关键词： approximate counters distributed computing divide and conquer multithreading parallel computing statistical counters

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Keep calm and react with foresight: strategies for low-latency and energy-efficient elastic data stream processing 16

Keep calm and react with foresight: strategies for low-laten...

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21st acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： De Matteis, Tiziano Mencagli, Gabriele Univ Pisa Dept Comp Sci Largo BPontecorvo 3 I-56127 Pisa Italy

ISBN: (纸本)9781450340922

This paper addresses the problem of designing scaling strategies for elastic data stream processing. Elasticity allows applications to rapidly change their configuration on-the-fly (e.g., the amount of used resources) in response to dynamic workload fluctuations. In this work we face this problem by adopting the Model Predictive Control technique, a control-theoretic method aimed at finding the optimal application configuration along a limited prediction horizon in the future by solving an online optimization problem. Our control strategies are designed to address latency constraints, using Queueing Theory models, and energy consumption by changing the number of used cores and the CPU frequency through the Dynamic Voltage and Frequency Scaling (DVFS) support available in the modern multicore CPUs. The proactive capabilities, in addition to the latency- and energy-awareness, represent the novel features of our approach. To validate our methodology, we develop a thorough set of experiments on a high-frequency trading application. The results demonstrate the high-degree of flexibility and configurability of our approach, and show the effectiveness of our elastic scaling strategies compared with existing state-of-the-art techniques used in similar scenarios.

关键词： Data Stream Processing Elasticity Multicore programming Model Predictive Control DVFS

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PAM: parallel Augmented Maps 18

PAM: Parallel Augmented Maps

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23rd acm sigplan symposium on principles and practice of parallel programming (PPoPP)

作者： Sun, Yihan Ferizovic, Daniel Belloch, Guy E. Carnegie Mellon Univ Pittsburgh PA 15213 USA Karlsruhe Inst Technol Karlsruhe Germany

ISBN: (纸本)9781450349826

Ordered (key-value) maps are an important and widely-used data type for large-scale data processing frameworks. Beyond simple search, insertion and deletion, more advanced operations such as range extraction, filtering, and bulk updates form a critical part of these frameworks. We describe an interface for ordered maps that is augmented to support fast range queries and sums, and introduce a parallel and concurrent library called PAM (parallel Augmented Maps) that implements the interface. The interface includes a wide variety of functions on augmented maps ranging from basic insertion and deletion to more interesting functions such as union, intersection, filtering, extracting ranges, splitting, and range-sums. We describe algorithms for these functions that are efficient both in theory and practice. As examples of the use of the interface and the performance of PAM we apply the library to four applications: simple range sums, interval trees, 2D range trees, and ranked word index searching. The interface greatly simplifies the implementation of these data structures over direct implementations. Sequentially the code achieves performance that matches or exceeds existing libraries designed specially for a single application, and in parallel our implementation gets speedups ranging from 40 to 90 on 72 cores with 2-way hyperthreading.

关键词： Data handling

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