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检索条件"任意字段=16th ACM Symposium on Principles and Practice of Parallel Programming"

共 407 条记录，以下是181-190 订阅

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TigerQuoll: parallel Event-based JavaScript 13

TigerQuoll: Parallel Event-based JavaScript

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18th acm SIGPLAN symposium on principles and practice of parallel programming

作者： Bonetta, Daniele Binder, Walter Pautasso, Cesare Univ Lugano USI Fac Informat Lugano Switzerland

ISBN: (纸本)9781450319225

JavaScript, the most popular language on the Web, is rapidly moving to the server-side, becoming even more pervasive. Still, JavaScript lacks support for shared memory parallelism, making it challenging for developers to exploit multicores present in both servers and clients. In this paper we present TigerQuoll, a novel API and runtime for parallel programming in JavaScript. TigerQuoll features an event-based API and a parallel runtime allowing applications to exploit a mutable shared memory space. the programming model of TigerQuoll features automatic consistency and concurrency management, such that developers do not have to deal with shared-data synchronization. TigerQuoll supports an innovative transaction model that allows for eventual consistency to speed up high-contention workloads. Experiments show that TigerQuoll applications scale well, allowing one to implement common parallelism patterns in JavaScript.

关键词： Languages Performance JavaScript Event-based programming parallelism Eventual Transactions

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Expressing Graph Algorithms Using Generalized Active Messages 13

Expressing Graph Algorithms Using Generalized Active Message...

引用

18th acm SIGPLAN symposium on principles and practice of parallel programming

作者： Edmonds, Nick Willcock, Jeremiah Lumsdaine, Andrew Indiana Univ Bloomington IN 47405 USA

ISBN: (纸本)9781450319225

Recently, graph computation has emerged as an important class of high-performance computing application whose characteristics differ markedly from those of traditional, compute-bound, kernels. Libraries such as BLAS, LAPACK, and others have been successful in codifying best practices in numerical computing. the data-driven nature of graph applications necessitates a more complex application stack incorporating runtime optimization. In this paper, we present a method of phrasing graph algorithms as collections of asynchronous, concurrently executing, concise code fragments which may be invoked both locally and in remote address spaces. A runtime layer performs a number of dynamic optimizations, including message coalescing, message combining, and software routing. Practical implementations and performance results are provided for a number of representative algorithms.

关键词： parallel Graph Algorithms Active Messages parallel programming Models

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Work-stealing with Configurable Scheduling Strategies 13

Work-stealing with Configurable Scheduling Strategies

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18th acm SIGPLAN symposium on principles and practice of parallel programming

作者： Wimmer, Martin Traeff, Jesper Larsson Cederman, Daniel Tsigas, Philippas Vienna Univ Technol Fac Informat Res Grp Parallel Comp A-1040 Vienna Austria Chalmers Univ Technol S-41296 Gothenburg Sweden

ISBN: (纸本)9781450319225

Work-stealing systems are typically oblivious to the nature of the tasks they are scheduling. they do not know or take into account how long a task will take to execute or how many subtasks it will spawn. Moreover, task execution order is typically determined by an underlying task storage data structure, and cannot be changed. there are thus possibilities for optimizing task parallel executions by providing information on specific tasks and their preferred execution order to the scheduling system. We investigate generalizations of work-stealing and introduce a framework enabling applications to dynamically provide hints on the nature of specific tasks using scheduling strategies. Strategies can be used to independently control both local task execution and steal order. Strategies allow optimizations on specific tasks, in contrast to more conventional scheduling policies that are typically global in scope. Strategies are composable and allow different, specific scheduling choices for different parts of an application simultaneously. We have implemented a work-stealing system based on our strategy framework. A series of benchmarks demonstrates beneficial effects that can be achieved with scheduling strategies.

关键词： Algorithms Work-stealing scheduler hints strategies priorities

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Automatic Problem Size Sensitive Task Partitioning on Heterogeneous parallel Systems 13

Automatic Problem Size Sensitive Task Partitioning on Hetero...

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18th acm SIGPLAN symposium on principles and practice of parallel programming

作者： Grasso, Ivan Kofler, Klaus Cosenza, Biagio Fahringer, thomas Univ Innsbruck Inst Informat A-6020 Innsbruck Austria

ISBN: (纸本)9781450319225

In this paper we propose a novel approach which automatizes task partitioning in heterogeneous systems. Our framework is based on the Insieme Compiler and Runtime infrastructure [1]. the compiler translates a single-device OpenCL program into a multi-device OpenCL program. the runtime system then performs dynamic task partitioning based on an offline-generated prediction model. In order to derive the prediction model, we use a machine learning approach that incorporates static program features as well as dynamic, input sensitive features. Our approach has been evaluated over a suite of 23 programs and achieves performance improvements compared to an execution of the benchmarks on a single CPU and a single GPU only.

关键词： Languages Algorithms Performance heterogeneous computing compilers GPU task partitioning code analysis machine learning runtime system

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ZOOMM: A parallel web browser engine for multicore mobile devices 13

ZOOMM: A parallel web browser engine for multicore mobile de...

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18th acm SIGPLAN symposium on principles and practice of parallel programming, PPoPP 2013

作者： Caşcaval, CǍlin Fowler, Seth Montesinos-Ortego, Pablo Piekarski, Wayne Reshadi, Mehrdad Robatmili, Behnam Weber, Michael Bhavsar, Vrajesh Qualcomm Research Silicon Valley Santa Clara CA United States

ISBN: (纸本)9781450319225

We explore the challenges in expressing and managing concurrency in browsers on mobile devices. Browsers are complex applications that implement multiple standards, need to support legacy behavior, and are highly dynamic and interactive. We present ZOOMM, a highly concurrent web browser engine prototype and show how concurrency is effectively exploited at different levels: speed up computation performance, preload network resources, and preprocess resources outside the critical path of page loading. On a dual-core Android mobile device we demonstrate that ZOOMM is two times faster than the native WebKit based browser when loading the set of pages defined in the Vellamo benchmark. © 2013 acm.

关键词： Web browsers

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parallel Schedule Synthesis for Attribute Grammars 13

Parallel Schedule Synthesis for Attribute Grammars

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18th acm SIGPLAN symposium on principles and practice of parallel programming

作者： Meyerovich, Leo A. Torok, Matthew E. Atkinson, Eric Bodik, Rastislav Univ Calif Berkeley Berkeley CA 94720 USA

ISBN: (纸本)9781450319225

We examine how to synthesize a parallel schedule of structured traversals over trees. In our system, programs are declaratively specified as attribute grammars. Our synthesizer automatically, correctly, and quickly schedules the attribute grammar as a composition of parallel tree traversals. Our downstream compiler optimizes for GPUs and multicore CPUs. We provide support for designing efficient schedules. First, we introduce a declarative language of schedules where programmers may constrain any part of the schedule and the synthesizer will complete and autotune the rest. Furthermore, the synthesizer answers debugging queries about how schedules may be completed. We evaluate our approach with two case studies. First, we created the first parallel schedule for a large fragment of CSS and report a 3X multicore speedup. Second, we created an interactive GPU-accelerated animation of over 100,000 nodes.

关键词： CSS layout sketching attribute grammars scheduling

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Multi-Level parallel Computing of Reverse Time Migration for Seismic Imaging on Blue Gene/Q 13

Multi-Level Parallel Computing of Reverse Time Migration for...

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18th acm SIGPLAN symposium on principles and practice of parallel programming

作者： Lu, Ligang Magerlein, Karen IBM Watson Res Ctr Yorktown Hts NY USA

ISBN: (纸本)9781450319225

Blue Gene/Q (BG/Q) is an early representative of increasing scale and thread count that will characterize future HPC systems: large counts of nodes, cores, and threads; and a rich programming environment with many degrees of freedom in parallel computing optimization. So it is both a challenge and an opportunity to it to accelerate the seismic imaging applications to the unprecedented levels that will significantly advance the technologies for the oil and gas industry. In this work we aim to address two important questions: how HPC systems with high levels of scale and thread count will perform in real applications; and how systems with many degrees of freedom in parallel programming can be calibrated to achieve optimal performance. Based on BG/Q's architecture features and RTM workload characteristics, we developed massive domain partition, MPI , and SIMD Our detailed deep analyses in various aspects of optimization also provide valuable experience and insights into how can be utilized to facilitate the advance of seismic imaging technologies. Our BG/Q RTM solution achieved a 14.93x speedup over the BG/P implementation. Our multi-level parallelism strategies for Reverse Time Migration (RTM) seismic imaging computing on BG/Q provides an example of how HPC systems like BG/Q can accelerate applications to a new level.

关键词： Multi-level parallelism parallel Computing High Performance Computing Performance Optimization Reverse Time Migration Seismic Imaging

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parallel programming with Big Operators

Parallel Programming with Big Operators

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18th acm SIGPLAN symposium on principles and practice of parallel programming

作者： Park, Changhee Steele, Guy L., Jr. Tristan, Jean-Baptiste Korea Adv Inst Sci & Technol Taejon South Korea

In the sciences, it is common to use the so-called "big operator" notation to express the iteration of a binary operator (the reducer) over a collection of values. Such a notation typically assumes that the reducer is associative and abstracts the iteration process. Consequently, from a programming point-of-view, we can organize the reducer operations to minimize the depth of the overall reduction, allowing a potentially parallel evaluation of a big operator expression. We believe that the big operator notation is indeed an effective construct to express parallel computations in the Generate/Map/Reduce programming model, and our goal is to introduce it in programming languages to support parallel programming. the effective definition of such a big operator expression requires a simple way to generate elements, and a simple way to declare algebraic properties of the reducer (such as its identity, or its commutativity). In this poster, we want to present an extension of Scala with support for big operator expressions. We show how big operator expressions are defined and how the API is organized to support the simple definition of reducers with their algebraic properties.

关键词： parallelism Mathematical notation Scala

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the Tasks with Effects Model for Safe Concurrency 13

The Tasks with Effects Model for Safe Concurrency

引用

18th acm SIGPLAN symposium on principles and practice of parallel programming

作者： Heumann, Stephen T. Adve, Vikram S. Wang, Shengjie Univ Illinois Urbana IL 61801 USA

ISBN: (纸本)9781450319225

Today's widely-used concurrent programming models either provide weak safety guarantees, making it easy to write code with subtle errors, or are limited in the class of programs that they can express. We propose a new concurrent programming model based on tasks with effects that offers strong safety guarantees while still providing the flexibility needed to support the many ways that con-currency is used in complex applications. the core unit of work in our model is a dynamically-created task. the model's key feature is that each task has programmer-specified effects, and a run-time scheduler is used to ensure that two tasks are run concurrently only if they have non-interfering effects. through the combination of statically verifying the declared effects of tasks and using an effect-aware run-time scheduler, our model is able to guarantee strong safety properties, including data race freedom and atomicity. It is also possible to use our model to write programs and computations that can be statically proven to behave deterministically. We describe the tasks with effects programming model and provide a formal dynamic semantics for it. We also describe our implementation of this model in an extended version of Java and evaluate its use in several programs exhibiting various patterns of concurrency.

关键词： Languages Verification Design Performance Tasks effects task scheduling concurrent and parallel programming task isolation data race freedom atomicity determinism

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Decentralized execution of constraint handling rules for ensembles 13

Decentralized execution of constraint handling rules for ens...

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15th symposium on principles and practice of Declarative programming, PPDP 2013

作者： Lam, Edmund S. L. Cervesato, Iliano Carnegie Mellon University United States

ISBN: (纸本)9781450321549

CHR is a declarative, concurrent and committed choice rule-based constraint programming language. In this paper, we adapt CHR to provide a decentralized execution model for parallel and distributed programs. Specifically, we consider an execution model consisting of an ensemble of computing entities, each with its own constraint store and each capable of communicating with its neighbors. We extend CHR into CHRe, in which rules are executed at a location and are allowed to access the constraint store of its immediate neighbors. We give an operational semantics for CHRe, denoted ω 0e, that defines incremental and asynchronous decentralized rewriting for the class of CHRe rules characterized by purely local matching (0-neighbor restricted rules). We show the soundness of the ω0e semantics with respect to the abstract CHR semantics. We then give a safe encoding of the more general 1-neighbor restricted rules as 0-neighbor restricted rules, and discuss how this encoding can be generalized to all CHRe programs. © 2013 acm.

关键词： Constraint programming

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