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检索条件"任意字段=24th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming, PPoPP 2019"

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Proceedings of the acm sigplan symposium on principles and practice of parallel programming, ppopp

Proceedings of the ACM SIGPLAN Symposium on Principles and P...

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

ISBN: (纸本)9781450362252

the proceedings contain 58 papers. the topics discussed include: beyond human-level accuracy: computational challenges in deep learning;throughput-oriented GPU memory allocation;SEP-graph: finding shortest execution paths for graph processing under a hybrid framework on GPU;incremental flattening for nested data parallelism;modular transactions: bounding mixed races in space and time;processing transactions in a predefined order;data-flow/dependence profiling for structured transformations;lightweight hardware transactional memory profiling;provably and practically efficient granularity control;semantics-aware scheduling policies for synchronization determinism;and a round-efficient distributed betweenness centrality algorithm.

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ppopp 2020 - Proceedings of the 2020 25th acm sigplan symposium on principles and practice of parallel programming

PPoPP 2020 - Proceedings of the 2020 25th ACM SIGPLAN Sympos...

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Journal Track at 18th International Semantic Web Conference, JT@ISWC 2019

the proceedings contain 13 papers. the topics discussed include: a guided walk into link key candidate extraction with relational concept analysis;reflections on profiling and cataloguing the content of SPARQL endpoints using SPORTAL;reflections on: modeling linked open statistical data;reflections on: DCAT-AP representation of Czech national open data catalog and its impact;reflections on: deep learning for noise-tolerant RDFS reasoning;reflections on: finding melanoma drugs through a probabilistic knowledge graph;reflections on: knowledge graph fact prediction via knowledge-enriched tensor factorization;the semantic sensor network ontology, revamped;and reflections on: knowmore - knowledge base augmentation with structured web markup.

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Building parallel programming language constructs in the AbleC extensible C compiler framework A ppopp Tutorial 19

Building parallel programming language constructs in the Abl...

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

作者： Carlson, Travis Van Wyk, Eric Univ Minnesota Dept Comp Sci & Engn Minneapolis MN 55455 USA

ISBN: (纸本)9781450362252

In this tutorial participants learn how to build their own parallel programming language features by developing them as language extensions in the ableC [4] extensible C compiler framework. By implementing new parallel programming abstractions as language extensions one can build on an existing host language and thus avoid re-implementing common language features such as the type checking and code generation of arithmetic expressions and control flow statements. Using ableC, one can build expressive language features that fit seamlessly into the C11 host language.

关键词： parallel programming

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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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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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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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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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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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S-EnKF: Co-designing for Scalable Ensemble Kalman Filter 19

S-EnKF: Co-designing for Scalable Ensemble Kalman Filter

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

作者： Xiao, Junmin Wang, Shijie Wan, Weiqiang Hong, Xuehai Tan, Guangming Univ Chinese Acad Sci Inst Comp Technol State Key Lab Comp Architecture Chinese Acad Sci Beijing Peoples R China

ISBN: (纸本)9781450362252

Ensemble Kalman filter (EnKF) is one of the most important methods for data assimilation, which is widely applied to the reconstruction of observed historical data for providing initial conditions of numerical atmospheric and oceanic models. With the improvement of data resolution and the increase in the amount of model data, the scalability of recent parallel implementations suffers from high overhead on data transfer. In this paper, we propose, S-EnKF: a scalable and distributed EnKF adaptation for modern clusters. With an in-depth analysis of new requirements brought forward by recent frameworks and limitations of current designs, we present a co-design of S-EnKF. For fully exploiting the resources available in modern parallel file systems, we design a concurrent access approach to accelerate the process of reading large amounts of background data. through a deeper investigation of the data dependence relations, we modify EnKF's workflow to maximize the overlap of file reading and local analysis with a new multi-stage computation approach. Furthermore, we push the envelope of performance further with aggressive co-design of auto-tuning through tradeoff between the benefit on runtime and the cost on processors based on classic cost models. the experimental evaluation of S-EnKF demonstrates nearly ideal strong scalability on up to 12,000 processors. the largest run sustains a performance of 3x-speedup compared with P-EnKF, which represents the state-of-art parallel implementation of EnKF.

关键词： ensemble Kalman filter parallel implementation domain localization data assimilation scalability

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