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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291-300 订阅

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Preliminary Results on NB-FEB, a Synchronization Primitive for parallel programming

Preliminary Results on NB-FEB, a Synchronization Primitive f...

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14th acm sigplan symposium on principles and practice of parallel programming

作者： Ha, Phuong Hoai Tsigas, Philippas Anshus, Otto J. Univ Tromso N-9001 Tromso Norway Chalmers Univ Technol Gothenburg Sweden

ISBN: (纸本)9781605583976

We introduce a non-blocking full/empty bit primitive, or NB-FEB for short, as a promising synchronization primitive for parallel programming on may-core architectures. We show that the NB-FEB primitive is universal, scalable and feasible. NB-FEB, together with registers, can solve the consensus problem for an arbitrary number of processes (universality). NB-FEB is combinable, namely its memory requests to the same memory location can be combined into only one memory request, which consequently mitigates performance degradation due to synchronization "hot spots" (scalability). Since NB-FEB is a variant of the original full/empty bit that always returns a value instead of waiting for a conditional flag, it is as feasible as the original full/empty bit, which has been implemented in many computer systems (feasibility).

关键词： Algorithms Reliability Theory many-core architectures non-blocking synchronization full/empty bit universal primitives combinability

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Comparability Graph Coloring for Optimizing Utilization of Stream Register Files in Stream Processors

Comparability Graph Coloring for Optimizing Utilization of S...

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14th acm sigplan symposium on principles and practice of parallel programming

作者： Yang, Xuejun Wang, Li Xue, Jingling Deng, Yu Zhang, Ying UNSW Programming Languages & Compilers Grp Sch Comp Sci & Engn Sydney NSW Australia

ISBN: (纸本)9781605583976

A stream processor executes an application that has been decomposed into a sequence of kernels that operate on streams of data elements. During the execution of a kernel, all streams accessed must be communicated through the SRF (Stream Register File), a non-bypassing software-managed on-chip memory. Therefore, optimizing utilization of the SRF is crucial for good performance. The key insight is that the interference graphs formed by the streams in stream applications tend to be comparability graphs or decomposable into a set of multiple comparability graphs. We present a compiler algorithm that can find optimal or near-optimal colorings in stream IGs, thereby improving SRF utilization than the First-Fit bin-packing algorithm, the best in the literature.

关键词： Algorithms Languages Performance Stream processor stream programming comparability graph coloring software-managed cache

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Towards concurrency refactoring for X10

Towards concurrency refactoring for X10

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2009 acm sigplan symposium on principles and practice of parallel programming, PPoPP'09

作者： Markstrum, Shane Fuhrer, Robert M. University of California Computer Science Department Los Angeles CA United States IBM T.J. Watson Research Center Hawthorne NY United States

ISBN: (纸本)9781605583976

In this poster, we present our vision of refactoring support for languages with a partitioned global address space memory model as embodied in the X10 programming language. We examine a novel refactoring, extract concurrent, that introduces additional concurrency within a loop by arranging for some user-selected code in the loop body to run in parallel with other iterations of the loop. We discuss the mechanisms and challenges for implementing this refactoring and how development of this refactoring provides insight for designing future refactorings. © 2009 acm.

关键词： Computer programming

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L2C2: Logic-based LSC Consistency Checking

L2C2: Logic-based LSC Consistency Checking

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11th International acm sigplan symposium on principles and practice of Declarative programming (PPDP 09)

作者： Guo, Hai-Feng Zheng, Wen Subramaniam, Mahadevan Univ Nebraska Dept Comp Sci Omaha NE 68182 USA

ISBN: (纸本)9781605585680

Live sequence charts (LSCs) have been proposed as an inter-object scenario-based specification and visual programming language for reactive systems. In this paper, we introduce a logic-based framework to check the consistency of an LSC specification. An LSC simulator has been implemented in logic programming, utilizing a memoized depth-first search strategy, to show how a reactive system in LSCs would response to a set of external event sequences. A formal notation is defined to specify external event sequences, extending the regular expression with a parallel operator and a testing control. The parallel operator allows interleaved parallel external events to be tested in LSCs simultaneously;while the testing control provides users to a new approach to specify and test certain temporal properties (e.g., CTL formula) in a form of LSC. Our framework further provides either a state transition graph or a failure trace to justify the consistency checking results.

关键词： live sequence chart (LSC) scenario-based programming PLAY-tree logic programming memoization

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Serialization Sets: A Dynamic Dependence-Based parallel Execution Model

Serialization Sets: A Dynamic Dependence-Based Parallel Exec...

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14th acm sigplan symposium on principles and practice of parallel programming

作者： Allen, Matthew D. Sridharan, Srinath Sohi, Gurindar S. Univ Wisconsin Dept Comp Sci Madison WI 53706 USA

ISBN: (纸本)9781605583976

This paper proposes a new parallel execution model where programmers augment a sequential program with pieces of code called serializers that dynamically map computational operations into serialization sets of dependent operations. A runtime system executes operations in the same serialization set in program order, and may concurrently execute operations in different sets. Because serialization sets establish a logical ordering on all operations, the resulting parallel execution is predictable and deterministic. We describe the API and design of Prometheus, a C++ library that implements the serialization set abstraction through compile-time template instantiation and a runtime support library. We evaluate a set of parallel programs running on the x86_64 and SPARC-V9 instruction sets and study their performance on multi-core, symmetric multiprocessor, and ccNUMA parallel machines. By contrast with conventional parallel execution models, we find that Prometheus programs are significantly easier to write, test, and debug, and their parallel execution achieves comparable performance.

关键词： Languages Performance parallel computing runtime system serialization sets serializer

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A Comparison of programming Models for Multiprocessors with Explicitly Managed Memory Hierarchies

A Comparison of Programming Models for Multiprocessors with ...

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14th acm sigplan symposium on principles and practice of parallel programming

作者： Schneider, Scott Yeom, Jae-Seung Rose, Benjamin Linford, John C. Sandu, Adrian Nikolopoulos, Dimitrios S. Virginia Tech Dept Comp Sci Blacksburg VA 24060 USA

ISBN: (纸本)9781605583976

On multiprocessors with explicitly managed memory hierarchies (EMM), software has the responsibility of moving data in and out of fast local memories. This task can be complex and error-prone even for expert programmers. Before we can allow compilers to handle the complexity for us, we must identify the abstractions that are general enough to allow us to write applications with reasonable effort, yet specific enough to exploit the vast on-chip memory bandwidth of EMM multi-processors. To this end, we compare two programming models against hand-tuned codes on the STI Cell, paying attention to programmability and performance. The first programming model, Sequoia, abstracts the memory hierarchy as private address spaces, each corresponding to a parallel task. The second, Cellgen, is a new framework which provides OpenMP-like semantics and the abstraction of a shared address spaces divided into private and shared data. We compare three applications programmed using these models against their hand-optimized counterparts in terms of abstractions, programming complexity, and performance.

关键词： Design Languages Cell BE Explicitly Managed Memory Hierarchies programming Models

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Stack-based parallel recursion on graphics processors

Stack-based parallel recursion on graphics processors

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2009 acm sigplan symposium on principles and practice of parallel programming, PPoPP'09

作者： Yang, Ke He, Bingsheng Luo, Qiong Sander, Pedro V. Shi, Pedro V. Zhejiang Univ. China HKUST Hong Kong

ISBN: (纸本)9781605583976

Recent research has shown promising results on using graphics processing units (GPUs) to accelerate general-purpose computation. However, today's GPUs do not support recursive functions. As a result, for inherently recursive algorithms such as tree traversal, GPU programmers need to explicitly use stacks to emulate the recursion. parallelizing such stack-based implementation on the GPU increases the programming difficulty;moreover, it isunclear how to improve the efficiency of such parallel implementations. As a first step to address both ease of programming and efficiency issues, we propose three parallel stack implementation alternatives that differ in the granularity of stack sharing. Taking tree traversals as an example, we study the performance tradeoffs between these alternatives and analyze their behaviors in various situations. Our results could be useful to both GPU programmers and GPU compiler writers. © 2009 acm.

关键词： Graphics processing unit

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Petascale Computing with Accelerators

Petascale Computing with Accelerators

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14th acm sigplan symposium on principles and practice of parallel programming

作者： Kistler, Michael Gunnels, John Brokenshire, Daniel Benton, Brad IBM Corp Austin TX 78758 USA IBM Corp Yorktown Hts NY 10598 USA

ISBN: (纸本)9781605583976

A trend is developing in high performance computing in which commodity processors are coupled to various types of computational accelerators. Such systems are commonly called hybrid systems. In this paper, we describe our experience developing an implementation of the Linpack benchmark for a petascale hybrid system, the LANL Roadrunner cluster built by IBM for Los Alamos National Laboratory. This system combines traditional x86-64 host processors with IBM PowerXCell (TM) 8i accelerator processors. The implementation of Linpack we developed was the first to achieve a performance result in excess of 1.0 PFLOPS, and made Roadrunner the #1 system on the Top500 list in June 2008. We describe the design and implementation of hybrid Linpack, including the special optimizations we developed for this hybrid architecture. We then present actual results for single node and multi-node executions. From this work, we conclude that it is possible to achieve high performance for certain applications on hybrid architectures when careful attention is given to efficient use of memory bandwidth, scheduling of data movement between the host and accelerator memories, and proper distribution of work between the host and accelerator processors.

关键词： Algorithms Performance Design Accelerators hybrid programming models

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Backtracking-based Load Balancing

Backtracking-based Load Balancing

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14th acm sigplan symposium on principles and practice of parallel programming

作者： Hiraishi, Tasuku Yasugi, Masahiro Umatani, Seiji Yuasa, Taiichi Kyoto Univ Acad Ctr Comp & Media Studies Kyoto 6068501 Japan Kyoto Univ Grad Sch Informat Kyoto 6068501 Japan

ISBN: (纸本)9781605583976

High-productivity languages for parallel computing become more important as parallel environments including multicores become more common. Cilk is such a language. It provides good load balancing for many applications including irregular ones;that is, it keeps all workers busy by creating plenty of "logical" threads and adopting the oldest-first work stealing strategy. This paper proposes a "logical thread"-free framework called Tascell, which achieves a higher performance and supports a wider range of parallel environments including clusters without loss of productivity. A Tascell worker spawns a "real" task only when requested by another idle worker. The worker performs the spawning by temporarily "backtracking" and restoring its oldest task-spawnable state. Our approach eliminates the cost of spawning/managing logical threads. It also promotes the reuse of workspaces and improves the locality of reference since it does not need to prepare a workspace for each concurrently runnable logical thread. Furthermore, Tascell enables elegant and highly-efficient backtrack search algorithms with delayed workspace copying. For instance, our 16-queens problem solver is 1.86 times faster than Cilk on a system with two dual-core processors. Our approach also enables a single program to run in both shared and distributed memory environments with reasonable efficiency and scalability.

关键词： Design Languages Performance load balancing parallel computing backtracking backtrack search

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Application-aware management parallel simulation collections

Application-aware management parallel simulation collections

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2009 acm sigplan symposium on principles and practice of parallel programming, PPoPP'09

作者： Yau, Siu-Man Karamcheti, Vijay Zorin, Denis Damevski, Kostadin Parker, Steven G. Courant Institute of Mathematical Sciences New York University United States Department of Computer Science University of Utah United States

ISBN: (纸本)9781605583976

This paper presents a system deployed on parallel clusters to manage a collection of parallel simulations that make up a computational study. It explores how such a system can extend traditional parallel job scheduling and resource allocation techniques to incorporate knowledge specific to the study. Using a UINTAH-based helium gas simulation code (ARCHES) and the SimX system for multi-experiment computational studies, this paper demonstrates that, by using application-specific knowledge in resource allocation and scheduling decisions, one can reduce the run time of a computational study from over 20 hours to under 4.5 hours on a 32-processor cluster, and from almost 11 hours to just over 3.5 hours on a 64-processor cluster. © 2009 acm.

关键词： Resource allocation

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