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检索条件"任意字段=Proceedings of the 19th ACM SIGPLAN symposium on Principles and practice of parallel programming"

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Impala: a middleware system for managing autonomic, parallel sensor systems 03

Impala: a middleware system for managing autonomic, parallel...

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9th acm sigplan symposium on principles and practice of parallel programming

作者： Liu, T Martonosi, M Princeton Univ Dept Comp Sci Princeton NJ 08544 USA Princeton Univ Dept Elect Engn Princeton NJ 08544 USA

ISBN: (纸本)9781581135886

Sensor networks are long-running computer systems with many sensing/compute nodes working to gather information about their environment, process and fuse that information, and in some cases, actuate control mechanisms in response. Like traditional parallel systems, communication between nodes is of fundamental importance, but is typically accomplished via wireless transceivers. One further key attribute of sensor networks is that they are almost always long-running systems, intended to operate in situ, with minimal direct human intervention, for months or years. this requirement for long-running autonomy mandates careful design of the runtime system that manages applications on each node, to ensure reliability and ease of upgrades over the life of the system. this paper describes Impala, a middleware architecture that enables application modularity, adaptivity, and repair-ability in wireless sensor networks. Impala allows software updates to be received via the node's wireless transceiver and to be applied to the running system dynamically. In addition, Impala also provides an interface for on-the-fly application adaptation in order to improve the performance, energy-efficiency, and reliability of the software system. Impala has been designed to be a part of the ZebraNet mobile sensor network, but we are also prototyping it within HP/Compaq iPAQ Pocket PC handhelds. We present performance data for both real system measurements of the Pocket PC version as well as simulations of a full mobile sensor system deployment. Overall, Impala is a lightweight runtime system that can greatly improve system reliability, performance, and energy-efficiency. the ideas introduced here for sensor networks have applicability more broadly in other long-running autonomous parallel systems as well.

关键词： design experimentation performance sensor networks middleware system software adaptation software update

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Proceeding of the acm sigplan symposium on principles and practice of parallel programming, PPOPP

Proceeding of the ACM SIGPLAN symposium on principles and pr...

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8th acm sigplan symposium on principles and practice of parallel programming

the proceedings contains 14 papers from the conference on the proceedings of the acm sigplan symposium on principles and practice of parallel programming, PPOPP. Topics discussed include: reference idempotency analysis: a framework for optimizing speculative execution;pointer and escape analysis for multithread programs;language support for motion-order matrices;efficient load balancing for wide-area divide-and-conquer applications;scalable queue-based spin locks with timeout;contention ellimination by replication of sequential sections in distributed shared memory programs;and accurate data redistribution cost estimation in software distributes shared memory systems.

关键词： parallel processing systems

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parallel programming challenges for Internet-scale computing (Entropia) 01

Parallel programming challenges for Internet-scale computing...

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8th acm sigplan symposium on principles and practice of parallel programming

作者： Chien, A.A. Entropia Inc. University of California San Diego CA United States

No abstract available.

ISBN: (纸本)9781581133462

No abstract available.

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parallel computing in 2010: Opportunities and challenges in a networked world 01

Parallel computing in 2010: Opportunities and challenges in ...

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8th acm sigplan symposium on principles and practice of parallel programming

作者： Foster, I. Argonne National Laboratory and University of Chicago

No abstract available.

ISBN: (纸本)9781581133462

No abstract available.

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Pointer and escape analysis for multithreaded programs 01

Pointer and escape analysis for multithreaded programs

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8th acm sigplan symposium on the principles and practice of parallel Computing

作者： Salcianu, A Rinard, M MIT Comp Sci Lab Cambridge MA 02139 USA

ISBN: (纸本)9781581133462

this paper presents a new combined pointer and escape analysis for multithreaded programs. the algorithm uses a new abstraction called parallel interaction graphs to analyze the interactions between threads and extract precise points-to, escape, and action ordering information for objects accessed by multiple threads. the analysis is compositional, analyzing each method or thread once to extract a parameterized analysis result that can be specialized for use in any context. It is also capable of analyzing programs. that use the unstructured form of multithreading present in languages such as Java and standard threads packages such as POSIX threads. We have implemented the analysis in the MIT Flex compiler for Java and used the extracted information to 1) verify that programs correctly use region-based allocation constructs, 2) eliminate dynamic checks associated with the use of regions, and 3) eliminate unnecessary synchronization. Our experimental results show that analyzing the interactions between threads significantly increases the effectiveness of the region analysis and region check elimination, but has little effect for synchronization elimination.

关键词： thREADS Multithreading Java Java programming language Pointer Unix operating system Escape Analysis

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LogGPS: A parallel computational model for synchronization analysis 01

LogGPS: A parallel computational model for synchronization a...

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8th acm sigplan symposium on the principles and practice of parallel Computing

作者： Ino, F Fujimoto, N Hagihara, K Osaka Univ Grad Sch Engn Sci Osaka 5608531 Japan

ISBN: (纸本)9781581133462

We present a new parallel computational model, named Log-GPS, which captures synchronization. the LogGPS model is an extension of the LogGP model, which abstracts communication on parallel platforms. Although the LogGP model captures long messages with one bandwidth parameter (G), it does not capture synchronization that is needed before sending a long message by high-level communication libraries. Our model has one additional parameter, S, defined as the threshold for message length, above which synchronous messages are sent. We also present some experimental results using both models. the results include (1) a verification of the LogGPS model, (2) an example of synchronization analysis using an MPI program and (3) a comparison of the models. the results indicate that the LogGPS model is more accurate than the LogGP model, and analyzing synchronization costs is important when improving parallel program performance.

关键词： parallel processing systems

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Statistical scalability analysis of communication operations in distributed applications 01

Statistical scalability analysis of communication operations...

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8th acm sigplan symposium on the principles and practice of parallel Computing

作者： Vetter, JS McCracken, MO Lawrence Livermore Natl Lab Ctr Appl Sci Comp Livermore CA 94551 USA

ISBN: (纸本)9781581133462

Current trends in high performance computing suggest that users will soon have widespread access to clusters of multiprocessors with hundreds, if not thousands, of processors. this unprecedented degree of parallelism will undoubtedly expose scalability limitations in existing applications, where scalability is the ability of a parallel algorithm on a parallel architecture to effectively utilize an increasing number of processors. Users will need precise and automated techniques for detecting the cause of limited scalability. this paper addresses this dilemma. First, we argue that users face numerous challenges in understanding application scalability: managing substantial amounts of experiment data, extracting useful trends from this data, and reconciling performance information with their application's design. Second, we propose a solution to automate this data analysis problem by applying fundamental statistical techniques to scalability experiment data. Finally, we evaluate our operational prototype on several applications, and show that statistical techniques offer an effective strategy for assessing application scalability. In particular, we find that non-parametric correlation of the number of tasks to the ratio of the time for communication operations to overall communication time provides a reliable measure for identifying communication operations that scale poorly.

关键词： Scalability Experimental data statistical techniques Consumers Communication Research Automated recording parallel architectures Surgery Multiprocessor High Performance Computing parallel algorithms

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Dynamic adaptation to available resources for parallel computing in an autonomous network of workstations 01

Dynamic adaptation to available resources for parallel compu...

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8th acm sigplan symposium on the principles and practice of parallel Computing

作者： Rencuzogullari, U Dwarkadas, S Univ Rochester Dept Comp Sci Rochester NY 14627 USA

ISBN: (纸本)9781581133462

Networks of workstations (NOWs), which are generally composed of autonomous compute elements networked together, axe an attractive parallel computing platform since they offer high performance at low cost. the autonomous nature of the environment, however, often results in inefficient utilization due to load imbalances caused by three primary factors: 1) unequal load (compute or communication) assignment to equally-powerful compute nodes, 2) unequal resources at compute nodes, and 3) multiprogramming. these load imbalances result in idle waiting time on cooperating processes that need to synchronize or communicate data. Additional waiting time may result due to local scheduling decisions in a multiprogrammed environment. In this paper, we present a combined approach of compile-time analysis, run-time load distribution, and operating system scheduler cooperation for improved utilization of available resources in an autonomous NOW. the techniques we propose allow efficient resource utilization by taking into consideration all three causes of load imbalance in addition to locality of access in the process of load distribution. the resulting adaptive load distribution and cooperative scheduling system allows applications to take advantage of parallel resources when available by providing better performance than when the loaded resources axe not used at all.

关键词： unbalanced load Load distribution parallel PROCESSING (COMPUTERS) networks of workstations Workstations autonomous network

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Contention elimination by replication of sequential sections in distributed shared memory programs 01

Contention elimination by replication of sequential sections...

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8th acm sigplan symposium on principles and practice of parallel programming

作者： Lu, H. Cox, A.L. Zwaenepoel, W. Department of Computer Science Rice University Houston TX 77005 United States

ISBN: (纸本)9781581133462

In shared memory programs contention often occurs at the transition between a sequential and a parallel section of the code. As all threads start executing the parallel section, they often access data just modified by the thread that executed the sequential section, causing a flurry of data requests to converge on that processor. We address this problem in a software distributed shared memory system by replicating the execution of the sequential sections on all processors. Communication during this replicated sequential execution is reduced by using multicast. We have implemented replicated sequential execution with multicast support in OpenMP/NOW, a version of of OpenMP that runs on networks of workstations. We do not rely on compile-time data analysis, and therefore we can handle irregular and pointer-based applications. We show significant improvement for two pointer-based applications that suffer from severe contention without replicated sequential execution.

关键词： parallel processing systems

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Accurate data redistribution cost estimation in software distributed shared memory systems 01

Accurate data redistribution cost estimation in software dis...

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8th acm sigplan symposium on principles and practice of parallel programming

作者： Morris III, D.G. Lowenthal, D.K. Hewlett-Packard Company 19447 Pruneridge Avenue Cupertino CA 95014 United States

ISBN: (纸本)9781581133462

Distributing data is one of the key problems in implementing efficient distributed-memory parallel programs. the problem becomes more difficult in programs where data redistribution between computational phases is considered. the global data distribution problem is to find the optimal distribution in multi-phase parallel programs. Solving this problem requires accurate knowledge of data redistribution cost. We are investigating this problem in the context of a software distributed shared memory (SDSM) system, in which obtaining accurate redistribution cost estimates is difficult. this is because SDSM communication is implicit: It depends on access patterns, page locations, and the SDSM consistency protocol. We have developed integrated compile- and run-time analysis for SDSM systems to determine accurate redistribution cost estimates with low overhead. Our resulting system, SUIF-Adapt, can efficiently and accurately estimate execution time, including redistribution, to within 5% of the actual time in all of our test cases and is often much closer. these precise costs enable SUIF-Adapt to find efficient global data distributions in multiple-phase programs.

关键词： parallel processing systems

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