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检索条件"任意字段=9th ACM SIGPLAN Symposium on Principles and Practice of Parallel Programming"

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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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Sequential and parallel Improvements in a Concurrent Functional programming Language 18

Sequential and Parallel Improvements in a Concurrent Functio...

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20th International symposium on principles and practice of Declarative programming (PPDP)

作者： Schmidt-Schauss, Manfred Sabel, David Dallmeyer, Nils Goethe Univ Frankfurt Frankfurt Germany

ISBN: (纸本)9781450364416

We propose a model for measuring the runtime of concurrent programs by the minimal number of evaluation steps. the focus of this paper are improvements, which are program transformations that improve this number in every context, where we distinguish between sequential and parallel improvements, for one or more processors, respectively. We apply the methods to CHF, a model of Concurrent Haskell extended by futures allowing declarative implementations of concurrent programs. the language CHF is a typed higher-order functional language with concurrent threads, monadic IO and MVars as synchronizing variables. We show that all deterministic reduction rules and several further useful program transformations are sequential and parallel improvements.

关键词： functional programming call-by-need evaluation parallel improvements

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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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Effective Performance Measurement and Analysis of Multithreaded Applications

Effective Performance Measurement and Analysis of Multithrea...

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

作者： Tallent, Nathan R. Mellor-Crummey, John M. Rice Univ Houston TX 77251 USA

ISBN: (纸本)9781605583976

Understanding why the performance of a multithreaded program does not improve linearly with the number of cores in a shared-memory node populated with one or more multicore processors is a problem of growing practical importance. this paper makes three contributions to performance analysis of multithreaded programs. First, we describe how to measure and attribute parallel idleness, namely, where threads are stalled and unable to work. this technique applies broadly to programming models ranging from explicit threading (e. g., Pthreads) to higher-level models such as Cilk and OpenMP. Second, we describe how to measure and attribute parallel overhead-when a thread is performing miscellaneous work other than executing the user's computation. By employing a combination of compiler support and post-mortem analysis, we incur no measurement cost beyond normal profiling to glean this information. Using idleness and overhead metrics enables one to pinpoint areas of an application where concurrency should be increased (to reduce idleness), decreased (to reduce overhead), or where the present parallelization is hopeless (where idleness and overhead are both high). third, we describe how to measure and attribute arbitrary performance metrics for high-level multithreaded programming models, such as Cilk. this requires bridging the gap between the expression of logical concurrency in programs and its realization at run-time as it is adaptively partitioned and scheduled onto a pool of threads. We have prototyped these ideas in the context of Rice University's HPCTOOLKIT performance tools. We describe our approach, implementation, and experiences applying this approach to measure and attribute work, idleness, and overhead in executions of Cilk programs.

关键词： Performance Measurement Algorithms Performance Analysis Call Path Profiling Multithreaded programming Models HPCTOOLKIT

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New model for integrated nested task and data parallel programming

New model for integrated nested task and data parallel progr...

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Proceedings of the 1997 6th acm sigplan symposium on principles and practice of parallel programming

作者： Subhlok, Jaspal Yang, Bwolen Carnegie Mellon Univ Pittsburgh United States

High Performance Fortran (HPF) has emerged as a standard language for data parallel computing. However, a wide variety of scientific applications are best programmed by a combination of task and data parallelism. therefore, a good model of task parallelism is important for continued success of HPF for parallel programming. this paper presents a task parallelism model that is simple, elegant, and relatively easy to implement in an HPF environment. Task parallelism is exploited by mechanisms for dividing processors into sub-groups and mapping computations and data onto processor subgroups. this model of task parallelism has been implemented in the Fx compiler at Carnegie Mellon University. the paper addresses the main issues in compiling integrated task and data parallel programs and reports on the use of this model for programming various flat and nested task structures. Performance results are presented for a set of programs spanning signal processing, image processing, computer vision and environment modeling. A variant of this task model is a new approved extension of HPF and this paper offers insight into the power of expression and ease of implementation of this extension.

关键词： parallel processing systems

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Accelerating CUDA Graph Algorithms at Maximum Warp 11

Accelerating CUDA Graph Algorithms at Maximum Warp

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16th acm symposium on principles and practice of parallel programming

作者： Hong, Sungpack Kim, Sang Kyun Oguntebi, Tayo Olukotun, Kunle Stanford Univ Comp Syst Lab Stanford CA 94305 USA

ISBN: (纸本)9781450301190

Graphs are powerful data representations favored in many computational domains. Modern GPUs have recently shown promising results in accelerating computationally challenging graph problems but their performance suffers heavily when the graph structure is highly irregular, as most real-world graphs tend to be. In this study, we first observe that the poor performance is caused by work imbalance and is an artifact of a discrepancy between the GPU programming model and the underlying GPU architecture. We then propose a novel virtual warp-centric programming method that exposes the traits of underlying GPU architectures to users. Our method significantly improves the performance of applications with heavily imbalanced workloads, and enables trade-offs between workload imbalance and ALU underutilization for fine-tuning the performance. Our evaluation reveals that our method exhibits up to 9x speedup over previous GPU algorithms and 12x over single thread CPU execution on irregular graphs. When properly configured, it also yields up to 30% improvement over previous GPU algorithms on regular graphs. In addition to performance gains on graph algorithms, our programming method achieves 1.3x to 15.1x speedup on a set of GPU benchmark applications. Our study also confirms that the performance gap between GPUs and other multi-threaded CPU graph implementations is primarily due to the large difference in memory bandwidth.

关键词： Algorithms Performance parallel graph algorithms CUDA GPGPU

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Experiences using Adaptive Concurrency in Transactional Memory with Lee's Routing Algorithm 08

Experiences using Adaptive Concurrency in Transactional Memo...

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acm sigplan symposium on principles and practice of parallel programming (PPoPP 08)

作者： Ansari, Mohammad Kotselidis, Christos Jarvis, Kim Lujan, Mikel Kirkham, Chris Watson, Ian Univ Manchester Manchester M13 9PL Lancs England

Experience in profiling Lee9;s routing algorithm, a new complex TM application, showed that transactional applications may exhibit dynamic exploitable parallelism, i.e. the amount of useful parallelism available at... 详细信息

ISBN: (纸本)9781595939609

Experience in profiling Lee's routing algorithm, a new complex TM application, showed that transactional applications may exhibit dynamic exploitable parallelism, i.e. the amount of useful parallelism available at any point in time varies during the execution of the application. Obviously, executing too many transactions at times when the available parallelism is low will lead to high contention and wasted computation in aborted transactions, and vice versa. Current Transactional Memory (TM) implementations do not account for this behavior. this work employs adaptive concurrency to dynamically adjust the number of threads executing transactions concurrently. Our preliminary evaluation is performed in DSTM2 using Lee's routing algorithm, both of which were simple to modify to enable adaptive concurrency, and shows significant reduction in resource usage, and modest performance gains.

关键词： Adaptive Concurrency DSTM2 Transactional Memory

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Using Data Structure Knowledge for Efficient Lock Generation and Strong Atomicity

Using Data Structure Knowledge for Efficient Lock Generation...

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15th acm sigplan symposium on principles and practice of parallel programming

作者： Upadhyaya, Gautam Midkiff, Samuel P. Pai, Vijay S. Purdue Univ W Lafayette IN 47907 USA

ISBN: (纸本)9781605587080

To achieve high-performance on multicore systems, shared-memory parallel languages must efficiently implement atomic operations. the commonly used and studied paradigms for atomicity are fine-grained locking, which is both difficult to program and error-prone;optimistic software transactions, which require substantial overhead to detect and recover from atomicity violations;and compiler-generation of locks from programmer-specified atomic sections, which leads to serialization whenever imprecise pointer analysis suggests the mere possibility of a conflicting operation. this paper presents a new strategy for compiler-generated locking that uses data structure knowledge to facilitate more precise alias and lock generation analyses and reduce unnecessary serialization. Implementing and evaluating these ideas in the Java language shows that the new strategy achieves eight-thread speedups of 0.83 to 5.9 for the five STAMP benchmarks studied, outperforming software transactions on all but one benchmark, and nearly matching programmer-specified fine-grained locks on all but one benchmark. the results also indicate that compiler knowledge of data structures improves the effectiveness of compiler analysis, boosting eight-thread performance by up to 300%. Further, the new analysis allows for software support of strong atomicity with less than 1% overhead for two benchmarks and less than 20% for three others. the strategy also nearly matches the performance of programmer-specified fine-grained locks for the SPECjbb2000 benchmark, which has traditionally not been amenable to static analyses.

关键词： Algorithms Performance Design Automatic lock generation transactional memory parallel programming

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the Tasks with Effects Model for Safe Concurrency 13

The Tasks with Effects Model for Safe Concurrency

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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

Today9;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... 详细信息

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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CPMA: An Efficient Batch-parallel Compressed Set Without Pointers 24

CPMA: An Efficient Batch-Parallel Compressed Set Without Poi...

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29th acm sigplan Annual symposium on principles and practice of parallel programming (PPoPP)

作者： Wheatman, Brian Burns, Randal Buluc, Aydin Xu, Helen Johns Hopkins Univ Baltimore MD 21218 USA Lawrence Berkeley Natl Lab Lawrence KS USA Georgia Inst Technol Atlanta GA USA

ISBN: (纸本)9798400704352

this paper introduces the batch-parallel Compressed Packed Memory Array (CPMA), a compressed, dynamic, ordered set data structure based on the Packed Memory Array (PMA). Traditionally, batch-parallel sets are built on pointerbased data structures such as trees because pointer-based structures enable fast parallel unions via pointer manipulation. Whencompared with cache-optimized trees, PMAswere slower to update but faster to scan. the batch-parallel CPMA overcomes this tradeoff between updates and scans by optimizing for cache-friendliness. On average, the CPMA achieves 3x faster batch-insert throughput and 4x faster range-query throughput compared with compressed PaC-trees, a state-of-the-art batch-parallel set library based on cache-optimized trees. We further evaluate the CPMA compared with compressed PaC-trees and Aspen, a state-of-the-art system, on a realworld application of dynamic-graph processing. the CPMA is on average 1.2x faster on a suite of graph algorithms and 2x faster on batch inserts when compared with compressed PaC-trees. Furthermore, the CPMA is on average 1.3x faster on graph algorithms and 2x faster on batch inserts compared with Aspen.

关键词： packed memory array batch-parallel compression data structures dynamic graphs

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