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检索条件"任意字段=Proceedings of the sixteenth workshop on Parallel and distributed simulation"

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Parts-oriented and distributed task planning for multiple robots

Parts-oriented and distributed task planning for multiple ro...

引用

International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： T. Nagata J.-i. Hirai Department of Computer Science and Communication Engineering Kyushu University Fukuoka Japan

Assembly task planning for multiple robots is highly complicated and cumbersome. A new assembly task planning system for multiple robots is proposed to avoid this problem and to improve the flexibility and the reliability in assembly tasks. In this system, parts with which a machine is composed are handled as part-objects and plans for assembling the machine are automatically generated as results of autonomous behaviors of these objects. The outline of the planning system, based on this concept is described. Some simulation results using a cooperative computational model are given.< >

关键词： Robotic assembly parallel robots Robotics and automation Manipulators Assembly systems Computational modeling Mobile robots Computer science Process planning Large-scale systems

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Granular security for a science gateway in structural bioinformatics

Granular security for a science gateway in structural bioinf...

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3rd International workshop on Science Gateways for Life Sciences 2011, IWSG-Life 2011

作者： Gesing, Sandra Grunzke, Richard Balaskó, Ákos Birkenheuer, Georg Blunk, Dirk Breuers, Sebastian Brinkmann, André Fels, Gregor Herres-Pawlis, Sonja Kacsuk, Peter Kozlovszky, Miklos Krüger, Jens Packschies, Lars Schäfer, Patrick Schuller, Bernd Schuster, Johannes Steinke, Thomas Szikszay Fabri, Anna Wewior, Martin Müller-Pfefferkorn, Ralph Kohlbacher, Oliver Zentrum Für Bioinformatik Eberhard-Karls-Universität Tübingen Germany Zentrum Für Informationsdienste und Hochleistungsrechnen Technische Universität Dresden Germany MTA SZTAKI Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary Paderborn Center for Parallel Computing Universität Paderborn Germany Department Für Chemie Universität zu Köln Germany Department Chemie Universität Paderborn Germany Fakultät Chemie TU Dortmund Germany Regionales Rechenzentrum Universität zu Köln Germany Konrad-Zuse-Institut Für Informationstechnik Berlin Germany Forschungszentrum Jülich Germany

Structural Bioinformatics is concerned with computational methods for the analysis and modeling of three-dimensional molecular structures. There is a plethora of computational tools available to work with structural data on a large scale. Using these tools on distributed computing infrastructures (DCI), however, is often hampered by a lack of suitable interfaces. The MoSGrid (Molecular simulation Grid) science gateway provides an intuitive user interface to several widelyused tools in structural bioinformatics. It ensures the confidentiality, integrity and availability of data via a granular security concept which covers all layers of the infrastructure. The concept applies SAML (Security Assertion Markup Language) and allows trust delegation from the user interface layer across the high-level middleware layer and the grid middleware layer down to the HPC facilities. SAML assertions had to be integrated into the MoSGrid infrastructure in several places: the workflow-enabled grid portal WS-PGRADE, the gUSE (grid User Support Environment) DCI services, and the cloud file system XtreemFS. The security infrastructure presented here allows single sign-on and thus lowers the hurdle for users to utilize large HPC infrastructures for structural bioinformatics. Copyright © 2011 for the individual papers by the papers authors.

关键词： User interfaces

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Performance comparison of real-time architectures using simulation

Performance comparison of real-time architectures using simu...

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IEEE International Conference on Embedded and Real-Time Computing Systems and Applications (RTCSA)

作者： Heejo Lee K. Toda Jong Kim K. Nishida E. Takahashi Y. Yamaguchi Department of Computer Science & Engineering Pohang University of Science and Technology Pohang South Korea Electro Technical Laboratory Tsukuba Japan

This paper presents a performance comparison of real-time system architectures. A discrete event-driven, task-based simulator is developed for evaluating the performance of parallel and distributed real-time systems. Real-time system components such as processor, network architectures, and scheduling policy are included in the simulator. simulation results show that priority-based communication and scheduling are more suitable for real-time systems than FIFO-based. The strategy of having a dedicated processor, which produces no effect on task execution by scheduling and packet/interrupt handling, is proven to enhance schedulability and predictability. This paper suggests a method for finding an appropriate real-time architecture for users having real-time requirements through the performance prediction of real-time systems.

关键词： Real time systems Discrete event simulation Job shop scheduling Processor scheduling Computational modeling Predictive models Computer architecture Computer aided manufacturing Computer simulation Computer science

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Massively parallel simulations of ATM systems 96

Massively parallel simulations of ATM systems

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proceedings of the tenth workshop on parallel and distributed simulation

作者： Krishnan Kumaran Boris Lubachevsky Anwar Elwalid Department of Physics Rutgers University Piscataway NJ and AT&T Bell Labs Murray Hill NJ Lucent Technologies Bell Labs Innovations 600 Mountain Avenue Murray Hill NJ

ISBN: (纸本)9780818675393

We simulate models of ATM communication systems on a massively parallel SIMD computer. Fast simulations of ATM models are needed because the regimes of interest usually involve high volumes of traffic and low failure rates. Unexpected practical and theoretical difficulties, partly due to the massive parallelism and SIMD aspects, were encountered and we show how to cope with them. In a replica-parallel simulation of an ATM system, large variations in computed statistics are caused by small differences in the distribution of employed random number generators. A comparison of these distributions using a secondary statistical measure served to disambiguate the results. It was also found that time-parallel simulations of ATM systems with Markov sources can be efficiently performed using parallel prefix methods only when the sources have a small number of states, while more complex sources require end-state matching for efficient simulation. We discovered that, with the proper choice of initial state distributions and partial regeneration points, the time and memory requirements can be much improved. Our simulations were carried out on the MasPar MP-1216 system with 16,384 processors, which was compared against an SGI workstation. We achieved about 60%-70% efficiency (speed-up of approx 35 compared to the ideal of approx 51).

关键词： random sampling markov sources replica-parallel time-parallel order statistics parallel prefix

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The treatment of state in optimistic systems 95

The treatment of state in optimistic systems

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proceedings of the ninth workshop on parallel and distributed simulation

作者： David Bruce Defence Research Agency st. Andrews Road Malvern Worcestershire WR14 3PS United Kingdom

ISBN: (纸本)9780818671203

Optimistic computation methods typically save copies of objects' state information, so that they can recover from erroneous “over-optimistic” computations. Such state saving is generally time and space consuming, and can be rather complicated both to implement and to use.I show how the data structure community's theory of persistence can be used not only to analyse and explain the treatment of state in optimistic systems, but also as a simple yet general mechanism for performing the necessary state saving with minimal impact on application *** results based on a benchmark application and an existing optimistic simulator are presented, showing that providing support for fully general object states is a realistic and practical option. In addition, I show how some existing state saving techniques—including support for shared state—can be derived, and discuss a number of ways in which the model might be extended.

关键词： state saving optimistic methods parallel discrete event simulation persistent data structures

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Effectiveness of global event queues in rollback reduction and load balancing 95

Effectiveness of global event queues in rollback reduction a...

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proceedings of the ninth workshop on parallel and distributed simulation

作者： Sushil K. Prasad Basem Naqib Mathematics and Computer Science Georgia State University Atlanta

ISBN: (纸本)9780818671203

Compared to highly optimized optimistic simulators which use local event queues for individual processors on a shared-memory computer, we demonstrate that employing a single global event queue drastically reduces the number of rollbacks, brings down the storage requirements, and achieves superior load balance. On a bus-based Silicon Graphics multiprocessor, these virtues consistently translated into faster execution times and higher speedups on those synthetic networks of medium- to coarse-grained logical processes which were ridden with rollbacks and load imbalance on local-queue-based simulators. A dynamic randomization-based load distribution scheme for local-event-queue simulators is also shown to be an effective improvement.

关键词： discrete event simulation global event queues shared-memory computer global event queue rollback reduction load balancing parallel algorithms data structures shared memory systems resource allocation load distribution scheme

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PCI-DMA/CPU handoff for increased effectiveness of checkpointing functionalities in CCL 03

PCI-DMA/CPU handoff for increased effectiveness of checkpoin...

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International workshop/Symposium on distributed simulation and Real-Time Applications (DS-RT)

作者： A. Santoro F. Quaglia Dipartimento di Informatica e Sistemistica Università di Roma La Sapienza Rome Italy

ISBN: (纸本)9780769520360

Checkpointing and Communication Library (CCL) is recently developed software in support of optimistic parallel discrete event simulation on myrinet clusters. Beyond low latency message delivery functionalities, CCL also offers non-blocking checkpointing functionalities supported by a programmable PCI DMA engine on board of myrinet cards. CCL employs resynchronization functionality between PCI DMA activities and CPU activities to maintain the consistency of checkpointed information (i.e. to prevent the CPU from updating information that still needs to be copied through DMAing). If re-synchronization is invoked before the checkpoint operation is completed, simulation activities carried out by the CPU may be forced to wait for checkpoint completion. Since data copy through the PCI DMA is slower than what achievable with the CPU, in pathological situations a re-synchronization period may last more than a whole checkpoint operation performed by the CPU, thus nullifying the potential benefit from offloading checkpointing from the CPU. This paper tackles such an issue by presenting the design and implementation of a handoff mechanism of checkpoint operations between PCI (Peripheral Component Interconnect) DMA (direct memory access)and CPU to enhance the effectiveness of checkpointing functionalities offered by CCL. Although a checkpoint operation is initially entrusted to the PCI DMA, whenever re-synchronization forces the simulation application to wait for its completion, the checkpoint operation is dynamically switched to the CPU, namely the fastest available device, since its timely completion has become a performance critical task for the simulation application.

关键词： Checkpointing Discrete event simulation Engines Synchronization Remuneration Software libraries Delay Pathology Clocks

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Load balancing for conservative simulation on shared memory multiprocessor systems 00

Load balancing for conservative simulation on shared memory ...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Boon Ping Gan Yoke Hean Low Sanjay Jain Stephen J. Turner Wentong Cai Wen Jing Hsu Shell Ying Huang Gintic Institute of Manufacturing Technology 71 Nanyang Drive Singapore 638075 School of Applied Science Nanyang Technological University Nanyang Avenue Singapore 639798

ISBN: (纸本)9780769506678

Load balancing is a crucial factor in achieving good performance for parallel discrete event simulations. In this paper, we present a load balancing scheme that combines both static partitioning and dynamic load balancing. The static partitioning scheme maps simulation objects to logical processes before simulation starts while the dynamic load balancing scheme attempt to balance the load during runtime. The static scheme involves two steps. First, the simulation objects that contribute to small lookahead are merged together by using a merging algorithm. Then a partitioning algorithm is applied. The merging is needed to ensure a consistent performance for our dynamic scheme. Our dynamic scheme is tailor-made for an asynchronous simulation protocol that does not rely on null messages. The performance study on a supply-chain simulation shows that the partitioning algorithm and dynamic load balancing are important in achieving good performance.

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Active virtual network management protocol 99

Active virtual network management protocol

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proceedings of the thirteenth workshop on parallel and distributed simulation

作者： Stephen F. Bush General Electric Corporate Research and Development KWC-512 One Research Circle Niskayuna NY

ISBN: (纸本)9780769501550

This paper introduces a novel algorithm, the Active Virtual Network Management Protocol, for predictive network management. It explains how the Active Virtual Network Management Protocol facilitates the management of an active network by allowing future predicted state information within an active network to be available to network management algorithms. This is accomplished by coupling ideas from optimistic discrete event simulation with active networking. The optimistic discrete event simulation method used is a form of self-adjusting Time Warp. It is self-adjusting because the system adjusts for predictions which are inaccurate beyond a given tolerance. The concept of a streptichron and autoanaplasis are introduced as mechanisms which take advantage of the enhanced flexibility and intelligence of active packets. Finally, it is demonstrated that the Active Virtual Network Management Protocol is a feasible concept.

关键词： Network Management Optimistic Discrete Event simulation Self-Prediction Active Networks

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A workstation-based parallel direct-execution simulator 97

A workstation-based parallel direct-execution simulator

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： Phillip M. Dickens Illinois Insititute of Technology

ISBN: (纸本)9780818679650

It is important to understand and efficiently predict the performance of large codes executing on massively parallel machines. However, these very large machines are scarce, expensive, and generally unavailable to large segments of the research community. It is therefore important to implement performance analysis tools for such machines on platforms that are readily available to the research community at large. To meet this need, we have ported LAPSE, a parallel direct-execution simulator, from the Intel Paragon to an ordinary cluster of workstations. The goal of this research is to provide researchers the opportunity to study codes designed for execution on a massively parallel machine while physically executing on a workstation cluster. However, we encountered significant performance problems when moving to a workstation cluster, due primarily to high communication and context switching costs. To reduce these costs, we implemented the virtual processors of the simulated system using light-weight threads rather than heavy-weight Unix processes. In this paper, we discuss the issues involved in moving from a process-based to a thread-based simulator, and demonstrate up to a four fold increase in performance by doing so.

关键词： parallel direct-execution simulator performance analysis tools thread-based simulator workstation cluster discrete event simulation workstation-based parallel direct-execution simulator heavy-weight Unix processes Intel Paragon high communication costs LAPSE light-weight threads context switching costs massively parallel machines

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