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检索条件"任意字段=Proceedings of the 1997 11th Workshop on Parallel and Distributed Simulation"

共 93 条记录，以下是11-20 订阅

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State saving for interactive optimistic simulation

State saving for interactive optimistic simulation

引用

11th workshop on parallel and distributed simulation

作者： Franks, S Gomes, F Unger, B Cleary, J Univ of Waikato Hamilton New Zealand

ISBN: (纸本)0818679654

Time Warp's optimistic scheduling requires the maintenance of simulation state history to support rollback in the event of causality violations. State history, and the ability to rollback the simulation, can provide unique functionality for human-in-the-loop simulation environments. this paper investigates the use of Time Warp to output valid simulation state in a near real-time manner re-execute portions of the simulation, and interactively probe simulation values to ascertain underlying causes of transient behavior. A shared-memory, multi-threaded interactive simulation architecture is presented and the additional state saving requirements imposed by interactivity are examined. the shortcomings of existing state saving schemes lead us to propose Multiplexed State Saving (MSS). By interleaving checkpointing and incremental state logs MSS provides bounded rollback costs and asynchronous access to prior simulation state. the interaction algorithms and MSS form a scalable, bounded cost component suitable for use in a real-time interactive Time Warp system.

关键词： Interactive computer systems

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Performance modeling of the IDES framework

Performance modeling of the IDES framework

引用

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

作者： Nicol, David M. Johnson, Michael M. Yoshimura, Ann S. Goldsby, Michael E. Dartmouth Coll Hanover NH United States

the IDES project at Sandia National Laboratories is developing a large scale portable parallel simulator for use in stockpile stewardship. IDES will use the Breathing-Time-Buckets synchronization protocol;to support IDES development, this paper studies a performance model and describes performance experiments on expected workload and architectural parameters. A new parallel algorithm for terminating the window quickly is also described and analyzed.

关键词： parallel processing systems

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Timestamp representations for virtual sequences

Timestamp representations for virtual sequences

引用

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

作者： Cleary, John G. McWha, J.A.David Pearson, Murray Univ of Waikato Hamilton New Zealand

the problem of executing sequential programs in parallel using the optimistic algorithm Time Warp is considered. this is done by first mapping the sequential execution to a control tree and then assigning timestamps to each node in the tree. For such timestamps to be effective in either hardware or software they must be finite, this implies that they must be periodically rescaled to allow old timestamps to be reused. A number of timestamp representations are described and compared on the basis of their complexity;the frequency and cost of rescaling;and the cost of performing basic operations, including comparison and creation of new timestamps.

关键词： parallel processing systems

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Breadth-first rollback in spatially explicit simulations

Breadth-first rollback in spatially explicit simulations

引用

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

作者： Deelman, Ewa Szymanski, Boleslaw K. Rensselaer Polytechnic Inst Troy United States

the efficiency of parallel Discrete Event simulations that use the optimistic protocol is strongly dependent on the overhead incurred by rollbacks. this paper introduces a novel approach to rollback processing which limits the number of events rolled back as a result of a straggler or antimessage. the method, called Breadth-First Rollback (BFR), is suitable for spatially explicit problems where the space is discretized and distributed among processes and simulation objects move freely in the space. BFR uses incremental state saving, allowing the recovery of causal relationships between events during rollback. these relationships are then used to determine which events need to be rolled back. Our results demonstrate an almost linear speedup - a dramatic improvement over the traditional approach to rollback processing.

关键词： parallel processing systems

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Asynchronous parallel algorithms for test set partitioned fault simulation

Asynchronous parallel algorithms for test set partitioned fa...

引用

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

作者： Krishnaswamy, Dilip Banerjee, Prithviraj Rudnick, Elizabeth M. Patel, Janak H. Univ of Illinois Urbana IL United States

We propose in this paper two new asynchronous parallel algorithms for test set partitioned fault simulation. the algorithms are based on a new two-stage approach to parallelizing fault simulation for sequential VLSI circuits in which the test set is partitioned among the available processors. these algorithms provide the same result as the previous synchronous two stage approach. However, due to the dynamic characteristics of these algorithms and due to the fact that there is very minimal redundant work, they run faster than the previous synchronous approach. A theoretical analysis comparing the various algorithms is also given to provide an insight into these algorithms. the implementations were done in MPI and are therefore portable to many parallel platforms. Results are shown for a shared memory multiprocessor.

关键词： parallel algorithms

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distributed numerical/simulative algorithm for the analysis of large continuous time Markov chains

Distributed numerical/simulative algorithm for the analysis ...

引用

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

作者： Buchholz, Peter Universitaet Dortmund Dortmund Germany

A distributed algorithm is introduced for the analysis of large continuous time Markov chains (CTMCs) by combining in some sense numerical solution techniques and simulation. CTMCs are described as a set of processes communicating via message passing. the state of a process is described by a probability distribution over a set of reachable states rather than by a single state. simulation is used to determine event times and messages types to be exchanged, whereas transitions are realized by vector matrix products as in iterative numerical analysis techniques. In this way, the state space explosion of numerical analysis is avoided, but it is still possible to determine more detailed results than with simulation. parallelization of the algorithm is realized applying a conservative synchronization scheme, which exploits the possibility of precomputing event times as already proposed for parallel simulation of CTMCs. In contrast to a pure simulation approach, the amount of computation is increased, whereas the amount of communication keeps constant. Hence it is possible to achieve even on a workstation cluster a significant speedup.

关键词： Markov processes

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Conservative synchronization in object-oriented parallel battlefield discrete event simulations

Conservative synchronization in object-oriented parallel bat...

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

作者： Hiller, James B. Hartrum, thomas C. Air Force Inst of Technology Wright-Patterson AFB OH United States

We present a conservative strategy for spatially decomposed parallel discrete event battlefield simulation. the traditional null message algorithm provides a foundation from which a mapping to generic simulation attributes can be made. We informally discuss preservation of logical correctness and freedom from deadlock. Experimental results demonstrate the potential execution time savings when load imbalance is not dominant;more importantly, they highlight improvement opportunities in spite of potential load imbalance. the net result is that a very reasonable performance gain can be delivered for little effort in a way that supports good simulation system design principles. the approach is straightforward and can be easily implemented as part of a more general sequential or parallel simulation support environment. While the approach is expressed in terms of battlefield simulation, its essence applies to many simulation applications.

关键词： parallel processing systems

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MRE: A flexible approach to multi-resolution modeling

MRE: A flexible approach to multi-resolution modeling

引用

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

作者： Natrajan, Anand Reynolds Jr., Paul F. Srinivasan, Sudhir Univ of Virginia Charlottesville United States

Multi-resolution representation of simulated entities is considered essential for a growing portion of distributed simulations. Heretofore, modelers have represented entities at just one level of resolution, or have represented concurrent representations in an inconsistent manner. We address the question of the cost of maintaining multiple, concurrent representations. We present a brief overview of our concept of a Multiple Resolution Entity (MRE) and Attribute Dependency Graph (ADG) both originally described elsewhere, and then compare simulation and consistency costs of some approaches, including our own MRE/ADG-based approach, to multi-resolution modeling. the cost analysis presented here is the first known analysis of its type, and will provide a basis for simulation designers to determine the best, and most cost-effective approach to supporting simulation of entities at different levels of resolution concurrently.

关键词： distributed computer systems

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Dag consistent parallel simulation: A predictable and robust conservative algorithm

Dag consistent parallel simulation: A predictable and robust...

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

作者： Cai, Wentong Letertre, Emmanuelle Turner, Stephen J. Nanyang Technological Univ Singapore Singapore

We present a novel approach to parallel discrete event simulation based on the Cilk model of multithreaded computation. Cilk's runtime system not only manages the low-level aspects of program execution, but also provides the user with an algorithmic model of performance which can be used to predict the execution time of a parallel simulation. Moreover, a Cilk application can `scale down' to run on a single processor with nearly the same performance as that of serial code. A conservative parallel discrete event simulation algorithm has been developed in which communication between logical processes is achieved using Cilk's virtual memory model, dag consistent shared memory. the simulation executes in cycles, where each cycle involves a divide and conquer computation. Although local lookahead information can be exploited, the algorithm is robust in that it also calculates a global simulation time for each cycle. It can therefore be used for applications where zero lookahead may occur.

关键词： parallel processing systems

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Speculative parallel simulation with an adaptive throttle scheme

Speculative parallel simulation with an adaptive throttle sc...

引用

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

作者： Tay, Seng Chuan Teo, Yong Meng Kong, Siew theng Natl Univ of Singapore Singapore Singapore

Excessive rollback recoveries due to overoptimistic event execution in Time Warp simulators often degrade their runtime performance. this paper presents a two-sided throttling scheme to dynamically adjust the event execution speed of Time Warp simulators. the proposed throttle is based on a new concept called global progress window, which allows the individual simulation process to be positioned on a global time scale, thereby to accelerate or suspend their event execution. As each simulation process can be throttled to a steady state, excessive rollback recoveries due to causality errors can be avoided. To quantify the effect of rollbacks and for purpose of comparing different Time Warp implementations, we propose two new measures called RPE (number of Rollback events Per committed Event), and Ε (relative Effectiveness in reducing rollback overhead). Our implementation results show that the proposed throttle effectively regulates the proceeding of each simulation process, resulting in a significant reduction in rollback thrashing and elapsed time.

关键词： parallel processing systems

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