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检索条件"任意字段=Proceedings of the 19th ACM SIGPLAN symposium on Principles and practice of parallel programming"

共 328 条记录，以下是91-100 订阅

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Provably and Practically Efficient Granularity Control 19

Provably and Practically Efficient Granularity Control

引用

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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Incremental Flattening for Nested Data parallelism 19

Incremental Flattening for Nested Data Parallelism

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

作者： Henriksen, Troels thoroe, Frederik Elsman, Martin Oancea, Cosmin Univ Copenhagen Copenhagen Denmark

ISBN: (纸本)9781450362252

Compilation techniques for nested-parallel applications that can adapt to hardware and dataset characteristics are vital for unlocking the power of modern hardware. this paper proposes such a technique, which builds on flattening and is applied in the context of a functional data-parallel language. Our solution uses the degree of utilized parallelism as the driver for generating a multitude of code versions, which together cover all possible mappings of the application's regular nested parallelism to the levels of parallelism supported by the hardware. these code versions are then combined into one program by guarding them with predicates, whose threshold values are automatically tuned to hardware and dataset characteristics. Our unsupervised method-of statically clustering datasets to code versions-is different from autotuning work that typically searches for the combination of code transformations producing a single version, best suited for a specific dataset or on average for all datasets. We demonstrate-by fully integrating our technique in the repertoire of a compiler for the Futhark programming language-significant performance gains on two GPUs for three real-world applications, from the financial domain, and for six Rodinia benchmarks.

关键词： functional language parallel compilers GPGPU

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Implementing parallel and Concurrent Tree Structures 19

Implementing Parallel and Concurrent Tree Structures

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

作者： Sun, Yihan Blelloch, Guy Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (纸本)9781450362252

As one of the most important data structures used in algorithm design and programming, balanced search trees are widely used in real-world applications for organizing data. Answering the challenges thrown up by modern largevolume and ever-changing data, it is important to consider parallelism, concurrency, and persistence. this tutorial will introduce techniques for supporting functionalities on trees, including various parallel algorithms, concurrency, multiversioning, etc. In particular, this tutorial will focus on an algorithmic framework for parallel balanced binary trees, which works for multiple balancing schemes, including AVL trees, red-black trees, weight-based trees, and treaps. this framework allows for theoretically-efficient algorithms. the corresponding implementation is available as a library, which demonstrates good performance both sequentially and in parallel in various use scenarios. this tutorial will focus on the following topics: 1) the algorithms and techniques used in the PAM library;2) the interface of the library and a hands-on introduction to the download/installation of the library;3) examples of applying the library to various applications and 4) introduction about other useful techniques for parallel tree structures and performance comparisons with PAM.

关键词： balanced tree augmented map parallel concurrent library PAM ordered set ordered map

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Lock-free channels for programming via communicating sequential processes 19

Lock-free channels for programming via communicating sequent...

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

作者： Koval, Nikita Alistarh, Dan Elizarov, Roman IST Austria Austria JetBrains Austria

ISBN: (纸本)9781450362252

Traditional concurrent programming involves manipulating shared mutable state. Alternatives to this programming style are communicating sequential processes (CSP) [1] and actor [2] models, which share data via explicit communication. Rendezvous channel is the common abstraction for communication between several processes, where senders and receivers perform a rendezvous handshake as a part of their protocol (senders wait for receivers and vice versa). Additionally to this, channels support the select expression. In this work, we present the first eficient lock-free channel algorithm, and compare it against Go [3] and Kotlin [4] baseline implementations. © 2019 Copyright held by the owner/author(s).

关键词： Locks (fasteners)

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throughput-Oriented GPU Memory Allocation 19

Throughput-Oriented GPU Memory Allocation

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

作者： Gelado, Isaac Garland, Michael NVIDIA Santa Clara CA 95051 USA

ISBN: (纸本)9781450362252

throughput-oriented architectures, such as GPUs, can sustain three orders of magnitude more concurrent threads than multicore architectures. this level of concurrency pushes typical synchronization primitives (e.g., mutexes) over their scalability limits, creating significant performance bottlenecks in modules, such as memory allocators, that use them. In this paper, we develop concurrent programming techniques and synchronization primitives, in support of a dynamic memory allocator, that are efficient for use with very high levels of concurrency. We formulate resource allocation as a two-stage process, that decouples accounting for the number of available resources from the tracking of the available resources themselves. To facilitate the accounting stage, we introduce a novel bulk semaphore abstraction that extends traditional semaphore semantics by optimizing for the case where threads operate on the semaphore simultaneously. We also similarly design new collective synchronization primitives that enable groups of cooperating threads to enter critical sections together. Finally, we show that delegation of deferred reclamation to threads already blocked greatly improves efficiency. Using all these techniques, our throughput-oriented memory allocator delivers both high allocation rates and low memory fragmentation on modern GPUs. Our experiments demonstrate that it achieves allocation rates that are on average 16.56 times higher than the counterpart implementation in the CUDA 9 toolkit.

关键词： Concurrency Memory Allocation GPU programming

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SEP-Graph: Finding Shortest Execution Paths for Graph Processing under a Hybrid Framework on GPU 19

SEP-Graph: Finding Shortest Execution Paths for Graph Proces...

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

作者： Wang, Hao Geng, Liang Lee, Rubao Hou, Kaixi Zhang, Yanfeng Zhang, Xiaodong Ohio State Univ Dept Comp Sci & Engn Columbus OH 43210 USA Northeastern Univ Dept Comp Sci & Engn Shenyang Peoples R China United Parallel Comp Corp Atlanta DE USA Virginia Tech Dept Comp Sci Blacksburg VA USA

ISBN: (纸本)9781450362252

In general, the performance of parallel graph processing is determined by three pairs of critical parameters, namely synchronous or asynchronous execution mode (Sync or Async), Push or Pull communication mechanism (Push or Pull), and Data-driven or Topology-driven traversing scheme (DD or TD), which increases the complexity and sophistication of programming and system implementation of GPU. Existing graph-processing frameworks mainly use a single combination in the entire execution for a given application, but we have observed their variable and suboptimal performance. In this paper, we present SEP-Graph, a highly efficient software framework for graph-processing on GPU. the hybrid execution mode is automatically switched among three pairs of parameters, with an objective to achieve the shortest execution time in each iteration. We also apply a set of optimizations to SEP-Graph, considering the characteristics of graph algorithms and underlying GPU architectures. We show the effectiveness of SEP-Graph based on our intensive and comparative performance evaluation on NVIDIA 1080, P100, and V100 GPUs. Compared with existing and representative GPU graph-processing framework Groute and Gunrock, SEP-Graph can reduce execution time up to 45.8 times and 39.4 times.

关键词： Graph Algorithms GPU Hybrid

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Efficient Race Detection with Futures 19

Efficient Race Detection with Futures

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

作者： Utterback, Robert Agrawal, Kunal Fineman, Jeremy Lee, I-Ting Angelina Monmouth Coll Monmouth IL 61462 USA Washington Univ St Louis MO 14263 USA Georgetown Univ Washington DC 20057 USA

ISBN: (纸本)9781450362252

this paper addresses the problem of provably efficient and practically good on-the-fly determinacy race detection in task parallel programs that use futures. Prior works on determinacy race detection have mostly focused on either task parallel programs that follow a series-parallel dependence structure or ones with unrestricted use of futures that generate arbitrary dependences. In this work, we consider a restricted use of futures and show that we can detect races more efficiently than with general use of futures. Specifically, we present two algorithms: MultiBags and MultiBags+. MultiBags targets programs that use futures in a restricted fashion and runs in time O(T-1 alpha(m, n)), where T-1 is the sequential running time of the program, a is the inverse Ackermann's function, m is the total number of memory accesses, n is the dynamic count of places at which parallelism is created. Since a is a very slowly growing function (upper bounded by 4 for all practical purposes), it can be treated as a close-to-constant overhead. MultiBags+ is an extension of MultiBags that target programs with general use of futures. It runs in time O((T-1 + k(2))alpha(m, n)) where T-1, alpha, m and n are defined as before, and k is the number of future operations in the computation. We implemented both algorithms and empirically demonstrate their efficiency.

关键词： dynamic program analysis determinacy race race detection series-parallel maintenance

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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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programming Quantum Computers: A Primer with IBM Q and D-Wave Exercises 19

Programming Quantum Computers: A Primer with IBM Q and D-Wav...

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

作者： Mueller, Frank Byrd, Greg Dreher, Patrick North Carolina State Univ Raleigh NC 27695 USA

ISBN: (纸本)9781450362252

this tutorial provides a hands-on introduction to quantum computing. It will feature the three pillars, architectures, programming, and algorithms/applications of quantum computing. Its focus is on the applicability of problems to quantum computing from a practical point, with only the necessary foundational coverage of the physics and theoretical aspects to understand quantum computing. Simulation software will be utilized complemented by access to actual quantum computers to prototype problem solutions. this should develop a better understanding of how problems are transformed into quantum algorithms and what programming language support is best suited for a given application area. As a first of its kind, to the best of our knowledge, the tutorial includes hands-on programming experience with IBM Q and D-Wave hardware.

关键词： quantum computing

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GOPipe: A granularity-oblivious programming framework for pipelined stencil executions on GPU 19

GOPipe: A granularity-oblivious programming framework for pi...

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

作者： Oh, Chanyoung Zheng, Zhen Shen, Xipeng Zhai, Jidong Yi, Youngmin University of Seoul Korea Republic of Tsinghua University China North Carolina State University United States

ISBN: (纸本)9781450362252

Recent studies have shown promising performance benefits of pipelined stencil applications. An important factor for the computing eficiency of such pipelines is the granularity of a task. We presents GOPipe, the first granularity-oblivious programming framework for eficient pipelined stencil executions. With GOPipe, programmers no longer need to specify the appropriate task granularity. GOPipe automatically finds it, and schedules tasks of that granularity while observing all inter-task and inter-stage data dependencies. In our experiments on four real-life applications, GOPipe outperforms the state-of-the-art by up to 4.57× with a much better programming productivity. © 2019 Copyright held by the owner/author(s).

关键词： Graphics processing unit

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