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

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A parallel neurochip for neural networks implementing the reactive tabu search algorithm: application case studies

A parallel neurochip for neural networks implementing the re...

引用

Euromicro workshop on parallel and distributed Processing

作者： G. Danese I. De Lotto F. Leporati A. Quaglini S. Ramat G. Tecchioili INFM sez. Pavia Pavia Italia Dip. di Informatica e Sistemistica Università di Pavia Italy Neuricam S. p. A Via S. Maria Maddalena Trento Italia

ISBN: (纸本)0769509878

In this work we present two different applications implemented on the neurocomputer Totem Nc3001 from Neuricam Inc. The goal of the experimentation is to test, on real problems, the performance of this powerful parallel unit consisting of 32 Digital Signal Processors (DSPs) and to evaluate its suitability to neural network applications. The first problem implemented is a typical classification algorithm in which the network recognises which points belong to different regions inside a 2D space. The second problem is more computationally heavy and consists of a network able to reproduce the eye movements, if properly stimulated. A comparison is reported between Matlab implementations or handwritten code run on workstations and the performance obtained from the Totem chip.

关键词： Neural networks Artificial neural networks Signal processing algorithms Computational modeling Multilayer perceptrons Digital signal processors Digital signal processing Mathematical model Circuit simulation Testing

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Semi-asynchronous checkpointing for optimistic simulation on a Myrinet based NOW

Semi-asynchronous checkpointing for optimistic simulation on...

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workshop on Principles of Advanced and distributed simulation (PADS)

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

ISBN: (纸本)076951104X

Great effort has been devoted to the design of optimized checkpointing strategies for optimistic parallel discrete event simulators. On the other hand, there is less work being done in the direction of improving the execution mode of any single checkpoint operation. Specifically, checkpoint operations are typically charged to the CPU, thus leading to freezing of the simulation application while checkpointing is in progress, i.e. the execution mode of the checkpointing protocol is typically synchronous. In this paper, we focus on improvements of the execution mode and present a software architecture, designed for Myrinet-based networks of workstations (NOWs), to avoid application freezing during any checkpoint operation, thus moving the execution itself towards an asynchronous mode. This is done by charging checkpoint operations to a hardware component that is distinct from the CPU, namely a DMA (direct memory access) engine. On the other hand, totally asynchronous checkpointing could suffer from data inconsistency whenever the content of a state buffer is accessed for further modifications while a checkpoint operation involving it has not yet completed. To avoid this, the architecture includes functionalities for resynchronization on demand. We have used these functionalities to implement an execution mode of the checkpointing protocol that we refer to as semi-asynchronous. By the results of an experimental study, we argue that the semi-asynchronous mode can be an effective solution to almost completely remove the delay associated with any checkpoint operation from the completion time of the simulation.

关键词： Checkpointing Design optimization Application software Discrete event simulation Protocols Software architecture Software design Workstations Hardware Engines

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Effective values: an approach for characterizing dependability parameters

Effective values: an approach for characterizing dependabili...

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International Conference and workshop on Engineering of Computer-Based Systems

作者： S. Noureddine A. Lehmann Department of Computer Engineering University of Federal Armed Forces Munich Germany

ISBN: (纸本)0769510868

The authors discuss a novel direction for evaluating system dependability. The research efforts outlined are part of a special focus concerning the dependability of complex distributed systems at the Department of Computer Engineering of the Federal Armed Forces University in Munich, Germany. Our approach emphasizes the behavior of components after they have been embedded in a system. We use the notion of effective values for the analysis and estimation of key dependability parameters. The concept is targeted to unify performance characterization with the dependability. Besides analysis, we report on some simulation results, which were in favor of our assumptions.

关键词： Hardware Application software Availability distributed computing Computer applications Computer science Military computing Concurrent computing parallel algorithms Computational complexity

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distributed motion planning for modular robots with unit-compressible modules

Distributed motion planning for modular robots with unit-com...

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IEEE International workshop on Intelligent Robots and Systems (IROS)

作者： Z. Butler S. Byrnes D. Rus Department of Computer Science Dartmouth College USA

The ability of self-reconfigurable robots to solve a variety of robot tasks comes in part from their use of a large number of modules. Effective use of these systems requires parallel actuation and planning, both for efficiency and independence from a central controller. This paper presents the PacMan algorithm, a technique for distributed actuation and planning. This algorithm was developed for systems with unit-compressible modules, such as the crystalline robot. We also describe some analytical properties of the PacMan planning and actuation, and discuss simulation and hardware experiments.

关键词： Motion planning Centralized control Crystallization Control systems parallel robots Legged locomotion Robotics and automation Shape control Computer science Educational institutions

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A causality based time management mechanism for federated simulation

A causality based time management mechanism for federated si...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： Bu-Sung Lee Wentong Cai Junlan Zhou School of Computer Engineering Nanyang Technological University Singapore

ISBN: (纸本)076951104X

One of the six categories of management services provided in the Run Time Infrastructure (RTI) to federated simulations is time management. Currently, it provides only two message ordering policies, that is, time stamp ordering and receipt ordering. Temporal anomalies occurring during the execution of federation due to the heterogeneous latencies in the communication network are not handled in receipt ordering. While time stamp ordering eliminates the temporal anomalies entirely, it incurs great communication latency, and huge bandwidth requirement. The paper presents a novel time management mechanism which provides a less costly message ordering service, namely causal ordering, to federates. It does not require the specification of lookahead and allows federates that do not require stringent message ordering properties to achieve much more efficient execution. A series of experiments has been carried out to benchmark the performance of this new time management mechanism and the results show that it includes a slight overhead compared to the receipt ordering mechanism but achieves significant performance improvement over the time stamp ordering mechanism.

关键词： Delay Computational modeling Technology management Engineering management Bandwidth Computer simulation Communication networks Runtime Large-scale systems Communication system control

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Causality representation and cancellation mechanism in time warp simulations

Causality representation and cancellation mechanism in time ...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： M. Chetlur P.A. Wilsey Department of ECECS Experimental Computing Laboratory Cincinnati OH USA

ISBN: (纸本)076951104X

The Time Warp synchronization protocol allows causality errors and then recovers from them with the assistance of a cancellation mechanism. Cancellation can cause the rollback of several other simulation objects that may trigger a cascading rollback situation where the rollback cycles back to the original simulation object. These cycles of rollback can cause the simulation to enter an unstable (or thrashing) state where little real forward simulation progress is achieved. To address this problem, knowledge of causal relations between events can be used during cancellation to avoid cascading rollbacks and to initiate early recovery operations from causality errors. In this paper we describe a logical time representation for Time Warp simulations that is used to disseminate causality information. The new timestamp representation, called Total Clocks, has two components: (i) a virtual time component, and (ii) a vector of event counters similar to Vector clocks. The virtual time component provides a one dimensional global simulation time and the vector of event counters records event processing rates by the simulation objects. This time representation allows us to disseminate causality information during event execution that can be used to allow early recovery, during cancellation. We propose a cancellation mechanism using Total Clocks that allows cascading rollbacks in Time Warp simulations that have FIFO communication channels.

关键词： Time warp simulation Clocks Computational modeling Synchronization Counting circuits Discrete event simulation Laboratories Protocols Acceleration

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An agent-based DDM for High Level Architecture

An agent-based DDM for High Level Architecture

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： G. Tan Liang Xu F. Moradi S. Taylor School of Computing National University of Singapore Singapore Swedish Defence Research Agency Sweden Department of Info. Sys. & Computing Brunei University Uxbridge UK

ISBN: (纸本)076951104X

The Data Distribution Management (DDM) service is one of the six services provided in the Runtime Infrastructure (RTI) of High Level Architecture (HLA). Its purpose is to perform data filtering and reduce irrelevant data communicated between federates. The two DDM schemes proposed for RTI, region based and grid based DDM, are oriented to send as little irrelevant data to subscribers as possible, but only manage to filter part of this information and some irrelevant data is still being communicated. Previously (G. Tan et al., 2000), we employed intelligent agents to perform data filtering in HLA, implemented an agent based DDM in RTI (ARTI) and compared it with the other two filtering mechanisms. The paper reports on additional experiments, results and analysis using two scenarios: the AWACS sensing aircraft simulation and the air traffic control simulation scenario. Experimental results show that compared with other mechanisms, the agent based approach communicates only relevant data and minimizes network communication, and is also comparable in terms of time efficiency. Some guidelines on when the agent based scheme can be used are also given.

关键词： distributed decision making Air traffic control Analytical models Runtime Information filtering Information filters Intelligent agent Aircraft Aerospace control Guidelines

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A causality based time management mechanism for federated simulation 01

A causality based time management mechanism for federated si...

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proceedings of the fifteenth workshop on parallel and distributed simulation

作者： Bu-Sung Lee Wentong Cai Junlan Zhou School of Computer Engineering Nanyang Technological University Singapore

ISBN: (纸本)9780769511047

One of the six categories of management services provided in the Run Time Infrastructure (RTI) to federated simulations is Time Management. Currently, it provides only two message ordering policies, that is, time stamp ordering and receive ordering. Temporal anomalies occurred during the execution of federation due to the heterogeneous latencies in the communication network are not handled in receive ordering. White time stamp ordering eliminates the temporal anomalies entirely, it incurs great communication latency and huge handwidth requirement. This paper presents a new time management mechanism which provides a less costly message ordering service, namely causal ordering, to federates. It does not require the specification of lookahead and allows federates that do not require stringent message ordering properties to achieve much more efficient execution. A series of experiments has been carried out to benchmark the performance of this new time management mechanism and the results show that if incurs a slight overhead compared to receive ordering mechanism but achieves significant performance improvement over time stamp ordering mechanism.

关键词： multicasting time management causal order delivery time stamp ordering direct dependency happen-before relationship distributed simulation

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Semi-asynchronous checkpointing for optimistic simulation on a Myrinet based NOW 01

Semi-asynchronous checkpointing for optimistic simulation on...

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proceedings of the fifteenth workshop on parallel and distributed simulation

作者： Francesco Quaglia Andrea Santoro Dipartimento di Informatica e Sistemistica Università di Roma "La Sapienza" Via Salaria 113 00198 Roma Italy

ISBN: (纸本)9780769511047

Great effort has been devoted to the design of optimized checkpointing strategies for optimistic parallel discrete event simulators. On the other hand there is less work in the direction to improve the execution mode of any single checkpoint operation. Specifically, checkpoint operations are typically charged to the CPU, thus leading to freezing of the simulation application while checkpointing is in progress, i.e. the execution mode of the checkpointing protocol is typically synchronous. In this paper we focus on improvements of the execution mode and present a software architecture, designed for myrinet based Network of Workstations (NOWs), to avoid application freezing during any checkpoint operation, thus moving the execution itself towards an asynchronous mode. This is done by charging checkpoint operations to a hardware component distinct from the CPU, namely a DMA engine. On the other hand, totally asynchronous checkpointing could suffer from data inconsistency whenever the content of a state buffer is accessed for further modifications while a checkpoint operation involving it is not yet completed. To avoid this, the architecture includes functionalities for resynchronization on demand. We have used these functionalities to implement an execution mode of the checkpointing protocol we refer to as semi-asynchronous. By the results of an experimental study we argue that the semi-asynchronous mode can be an effective solution to almost completely remove the delay associated with any checkpoint operation from the completion time of the simulation.

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proceedings Fourteenth workshop on parallel and distributed simulation

Proceedings Fourteenth Workshop on Parallel and Distributed ...

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workshop on Principles of Advanced and distributed simulation (PADS)

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