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

共 1174 条记录，以下是251-260 订阅

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Global synchronization for optimistic parallel discrete event simulation 93

Global synchronization for optimistic parallel discrete even...

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proceedings of the 7th workshop on parallel and distributed simulation

作者： Nicol, David M. Coll of William and Mary Williamsburg VA United States

ISBN: (纸本)1565550552

A number of optimistic synchronization schemes for parallel simulation rely upon a global synchronization. The problem is to determine when every processor has completed all its work, and there are no messages in transit in the system that will cause more work. Most previous solutions to the problem have used distributed termination algorithms, which are inherently serial;other parallel mechanisms may be inefficient. In this paper we describe an efficient parallel algorithm derived from a common `barrier' synchronization algorithm used in parallel processing. The algorithm's principle attraction is speed, and generality - it is designed to be used in contexts more general than parallel discrete-event simulation. To establish our claim to speed, we compare our algorithm's performance with the standard barrier algorithm, and find that its additional costs are not excessive. Our experiments are conducted using up to 256 processors on the Intel Touchstone Delta.

关键词： Computer simulation

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An efficient sort-based DDM matching algorithm for HLA applications with a large spatial environment 07

An efficient sort-based DDM matching algorithm for HLA appli...

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21st International workshop on Principles of Advanced and distributed simulation (PADS 2007)

作者： Pan, Ke Turner, Stephen John Cai, Wentong Li, Zengxiang Nanyang Technol Univ Sch Comp Engn Parallel & Distributed Comp Ctr Singapore 639798 Singapore

ISBN: (纸本)9780769528984

simulation is a low cost and safe alternative to solve complex problems in various areas. To promote reuse and interoperability of simulation applications and link geographically dispersed simulation components, distributed simulation was introduced. The High Level Architecture (HLA) is the IEEE standard for distributed simulation. To optimize communication efficiency between simulation components, HLA defines a Data Distribution Management (DDM) service group for filtering out unnecessary data exchange. It relies on the computation of overlap between update and subscription regions, which is called matching. In this paper we propose an efficient sort-based DDM matching algorithm for HLA applications with a large spatial environment. A theoretical analysis of our algorithm concludes that it should have good storage and computational scalability. The experimental results have verified the theoretical conclusions by showing that our algorithm has much less storage requirement than the original sort-based matching algorithm and generally has the best computational performance when compared with region-based and the original sort-based matching algorithms.

关键词： distributed decision making Computational modeling Subscriptions Routing Costs distributed computing Computer architecture Filtering Concurrent computing Algorithm design and analysis

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proceedings of the 1996 4th International workshop on Modeling, Analysis, and simulation of Computer and Telecommunication Systems

Proceedings of the 1996 4th International Workshop on Modeli...

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proceedings of the 1996 4th International workshop on Modeling, Analysis, and simulation of Computer and Telecommunication Systems

The proceedings contains 47 papers. Topics discussed include data immersion, computer networks, trace driven simulation, instrumentation, distributed computer systems, computer simulation, algorithms, parallel process... 详细信息

关键词： parallel processing systems

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parallel discrete event simulation using space-time events 2

Parallel discrete event simulation using space-time events

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2nd Euromicro workshop on parallel and distributed Processing, PDP 1994

作者： Ahmed, Hallo BArriga, Luis Ayani, Rassul Stockholm Sweden

ISBN: (纸本)0818653701

In order to guarantee correctness of simulations, conventional parallel Discrete Event simulation models impose a sequential mode of execution on the events belonging to a logical process (LP). This constraint, which is aimed at preserving causality, limits the amount of parallelism that can be exploited within one LP. In this paper, we propose a technique to relax this constraint without compromising correctness of the simulation. The approach is based on associating a scope with each event message. An LP can determine, by comparing scopes, whether any two events in its event list are independent, i.e. can be processed in parallel. This approach is applied to a PDES scheme called the Conservative Time Windows. © 1994 IEEE.

关键词： Discrete event simulation

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Hierarchical federations: An architecture for information hiding

Hierarchical federations: An architecture for information hi...

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15th workshop on parallel and distributed simulation (PADS 2001)

作者： Cai, W. Turner, S.J. Boon Ping Gan School of Computer Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore

In a distributed simulation, simulation components of various types are executed at geographically different locations, forming a simulation federation to create a common virtual environment. Under the High Level Architecture (HLA), information that will be produced and consumed by a simulation component is defined in its object model, and how that information is produced and consumed is well encapsulated inside the simulation component's implementation. However, in the current implementation of the HLA's Runtime Infrastructure (RTI), information hiding between groups of simulation components in a simulation federation is not addressed. In this paper, we discuss how hierarchical federations architectures can be used to tackle this problem. The hierarchical federations architecture adopted in this paper differs from the existing architectures in that it is based on a hybrid approach for inter-operability between simulation federations. To demonstrate the information hiding using the architecture, a distributed semiconductor supply-chain simulation is also described in the paper.

关键词： distributed computer systems

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A performance-oriented comparative study of the Chapel high-productivity language to conventional programming environments 13

A performance-oriented comparative study of the Chapel high-...

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13th International workshop on Programming Models and Applications for Multicores and Manycores (PMAM) part of PPoPP Conference

作者： Helbecque, Guillaume Gmys, Jan Carneiro, Tiago Melab, Nouredine Bouvry, Pascal Univ Lille CNRS CRIStAL UMR 9189 Inria Lille Nord Europe Lille France Univ Luxembourg FSTM Esch Sur Alzette Luxembourg Univ Luxembourg DCS FSTM SnT Luxembourg Luxembourg

ISBN: (纸本)9781450393393

The increase in complexity, diversity and scale of high performance computing environments, as well as the increasing sophistication of parallel applications and algorithms call for productivity-aware programming languages for high-performance computing. Among them, the Chapel programming language stands out as one of the more successful approaches based on the Partitioned Global Address Space programming model. Although Chapel is designed for productive parallel computing at scale, the question of its competitiveness with well-established conventional parallel programming environments arises. To this end, this work compares the performance of Chapel-based fractal generation on shared- and distributed-memory platforms with corresponding OpenMP and MPI+X implementations. The parallel computation of the Mandelbrot set is chosen as a test-case for its high degree of parallelism and its irregular workload. Experiments are performed on a cluster composed of 192 cores using the French national testbed Grid'5000. Chapel as well as its default tasking layer demonstrate high performance in shared-memory context, while Chapel competes with hybrid MPI+OpenMP in distributed-memory environment.

关键词： Chapel MPI Multi-core OpenMP parallel computing Productivity-awareness

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Optimistic distributed simulation based on transitive dependency tracking

Optimistic distributed simulation based on transitive depend...

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proceedings of the 1997 11th workshop on parallel and distributed simulation

作者： Damani, Om P. Wang, Yi-Min Garg, Vijay K. Univ of Texas at Austin Austin TX United States

In traditional optimistic distributed simulation protocols, a logical process (LP) receiving a straggler rolls back and sends out anti-messages. Receiver of an anti-message may also roll back and send out more anti-messages. So a single straggler may result in a large number of anti-messages and multiple rollbacks of some LPs. In our protocol, an LP receiving a straggler broadcasts its rollback. On receiving this announcement, other LPs may roll back but they do not announce their rollbacks. So each LP rolls back at most once in response to each straggler. Anti-messages are not used. This eliminates the need for output queues and results in simple memory management. It also eliminates the problem of cascading rollbacks and echoing, and results in faster simulation. All this is achieved by a scheme for maintaining transitive dependency information. The cost incurred includes the tagging of each message with extra dependency information and the increased processing time upon receiving a message. We also present the similarities between the two areas of distributed simulation and distributed recovery. We show how the solutions for one area can be applied to the other area.

关键词： distributed computer systems

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XSim:: Real-time analytic parallel simulations 16

<i>XSim</i>:: Real-time analytic parallel simulations

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16th workshop on parallel and distributed simulation

作者： Carothers, CD Rensselaer Polytech Inst Dept Comp Sci Troy NY 12180 USA

ISBN: (纸本)0769516084

Of critical importance to any real-time system is the issue of predictability. We divide overall system predictability into two parts: algorithmic and systemic. Algorithmic predictability is concerned with ensuring that the parallel simulation engine and model from a complexity point of view are able to consistently yield results within a real-time deadline. Systemic predictability is concerned with ensuring that OS scheduling, interrupts and virtual memory overheads are consistent over a real-time period. To provide a framework for investigating systemic predictability, we define a new class of parallel simulation called Extreme simulation or XSim. An XSim is any analytic parallel simulation that is able to generate a statistically valid result by a real-time deadline. Typically, this deadline is between 10 and 100 milliseconds. XSims are expected to provide decision support to existing complex, realtime systems. As a new design and implementation methodology for realizing XSims, we embed a state-of-the-art optimistic simulator into the Linux operating system. In this operating environment, OS scheduling and interrupts are disabled. Given a 50 millisecond model completion deadline, we observe that the XSim has a systemic predictability, measure of 98% compared with only 56% for the same Time Warp system operating in user-level.

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Exploring multi-grained parallelism in compute-intensive DEVS simulations 10

Exploring multi-grained parallelism in compute-intensive DEV...

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24th Annual workshop on Principles of Advanced and distributed simulation, PADS 2010

作者： Liu, Qi Wainer, Gabriel Department of Systems and Computer Engineering Carleton University Ottawa ON Canada

ISBN: (纸本)9781424472918

We propose a computing technique for efficient parallel simulation of compute-intensive DEVS models on the IBM Cell processor, combining multi-grained parallelism and various optimizations to speed up the event execution. Unlike most existing parallelization strategies, our approach explicitly exploits the massive fine-grained event-level parallelism inherent in the simulation process, while most of the logical processes are virtualized, making the achievable parallelism more deterministic and predictable. Together, the parallelization and optimization strategies produced promising experimental results, accelerating the simulation of a 3D environmental model by a factor of up to 33.06. The proposed methods can also be applied to other multicore and shared-memory architectures. © 2010 IEEE.

关键词： parallel processing systems

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parallel discrete-event simulation (PDES): a case study in design, development, and performance using SPEEDES

Parallel discrete-event simulation (PDES): a case study in d...

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proceedings of the 9th workshop on parallel and distributed simulation (PADS'95)

作者： Wieland, Frederick Blair, Eric Zukas, Tony MITRE Corp McLean United States

Can parallel simulations efficiently exploit a network of workstations? Why haven't PDES models followed standard modeling methodologies? Will the field of PDES survive, and if so, in what form? Researchers in the PDES field have addressed these questions and others in a series of papers published in the last few years [1,2,3,4]. The purpose of this paper is to shed light on these questions, by documenting an actual case study of the development of an optimistically synchronized PDES application on a network of workstations. This paper is unique in that its focus is not necessarily on performance, but on the whole process of developing a model, from the physical system being simulated, through its conceptual design, validation, implementation, and, of course, its performance. This paper also presents the first reported performance results indicating the impact of risk on performance. The results suggest that the optimal value of risk is sensitive to the latency parameters of the communications network.

关键词： Computer simulation

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