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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261-270 订阅

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Towards parallel Non Serial Dynamic programming for Solving Hard Weighted CSP

Towards Parallel Non Serial Dynamic Programming for Solving ...

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16th Annual International Conference on the principles and practice of Constraint programming

作者： Allouche, David de Givry, Simon Schiex, thomas INRA Unite Biometrie & Intelligence Artificielle UR 875 F-31320 Castanet Tolosan France

ISBN: (纸本)9783642153952

We introduce a parallelized version of tree-decomposition based dynamic programming for solving difficult weighted CSP instances on many cores. A tree decomposition organizes cost functions in a tree of collection of functions called clusters. By processing the tree from the leaves up to the root, we solve each cluster concurrently, for each assignment of its separator, using a state-of-the-art exact sequential algorithm. the grain of parallelism obtained in tins way is directly related to the tree decomposition used. We use a dedicated strategy for building suitable decompositions. We present preliminary results of our prototype running on a cluster with hundreds of cores on different decomposable real problems. this implementation allowed us to solve the last open CELAR radio link frequency assignment instance to optimality.

关键词： Dynamic programming

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principles and practice of Constraint programming, CP 2010 - 16th International Conference, Proceedings

Principles and Practice of Constraint Programming, CP 2010 -...

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16th International Conference on principles and practice of Constraint programming, CP 2010

ISBN: (纸本)364215395X

the proceedings contain 49 papers. the topics discussed include: constraint-directed search in computational finance and economics;constraints, graphs, algebra, logic, and complexity;testing expressibility is hard;applying constraint programming to identification and assignment of service professionals;computing the density of states of Boolean formulas;towards parallel non serial dynamic programming for solving hard weighted CSP;making adaptive an interval constraint propagation algorithm exploiting monotonicity;checking-up on branch-and-check;spatial, temporal, and hybrid decompositions for large-scale vehicle routing with time windows;propagating the bin packing constraint using linear programming;sweeping with continuous domains;a new hybrid tractable class of soft constraint problems;a propagator for maximum weight string alignment with arbitrary pairwise dependencies;and generating special-purpose stateless propagators for arbitrary constraints.

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Architectural Support for Cilk Computations on Many-core Architectures

Architectural Support for Cilk Computations on Many-core Arc...

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

作者： Long, Guoping Fan, Dongrui Zhang, Junchao Chinese Acad Sci Inst Comp Technol Key Lab Comp Syst & Architecture Beijing 100864 Peoples R China

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Exploiting Global Optimizations for OpenMP Programs in the OpenUH Compiler

Exploiting Global Optimizations for OpenMP Programs in the O...

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

作者： Huang, Lei Eachempati, Deepak Hervey, Marcus W. Chapman, Barbara Univ Houston Dept Comp Sci Houston TX 77004 USA

ISBN: (纸本)9781605583976

the advent of new parallel architectures has increased the need for parallel optimizing compilers to assist developers in creating efficient code. OpenUH is a state-of-the-art optimizing compiler, but it only performs a limited set of optimizations for OpenMP programs due to its conservative assumptions of shared memory programming. these limitations may prevent some OpenMP applications from being fully optimized to the extent of its sequential counterpart. this paper describes our design and implementation of a parallel data flow framework, consisting of a parallel Control Flow Graph (PCFG) and a parallel SSA (PSSA) representation in OpenUH, to model data flow for OpenMP programs. this framework enables the OpenUH compiler to perform all classical scalar optimizations for OpenMP programs, in addition to conducting OpenMP specific optimizations.

关键词： Language Performance theory Compiler Analysis OpenMP parallel SSA

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Turbocharging Boosted Transactions or: How I Learnt to Stop Worrying and Love Longer Transactions

Turbocharging Boosted Transactions or: How I Learnt to Stop ...

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

作者： Kulkarni, Chinmay Unsal, Osman Cristal, Adrian Ayguade, Eduard Valero, Mateo Birla Inst Technol & Sci Pilani Rajasthan India Tech Univ Catalunya Catalunya Spain

ISBN: (纸本)9781605583976

Boosted transactions offer an attractive method that enables programmers to create larger transactions that scale well and offer deadlock-free guarantees. However, as boosted transactions get larger, they become more susceptible to conflicts and aborts. We describe a linear-time algorithm to detect transactions that cannot make progress, which transactions need to be aborted, and when. the algorithm guarantees zero false positives with minimal aborts. Our proposals, as implemented in DSTM2, increase the transactional throughput of the system, often by more than 30%.

关键词： Algorithms Performance Concurrency parallel programming transactional memory deadlocks deadlock-detection

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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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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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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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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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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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