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

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Performance modeling of the IDES framework 97

Performance modeling of the IDES framework

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： David M. Nicol Michael M. Johnson Ann S. Yoshimura Michael E. Goldsby Dept. of Computer Science Dartmouth College Hanover NH Sandia National Laboratories Livermore CA

ISBN: (纸本)9780818679650

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 work load and architectural parameters. A new parallel algorithm for terminating the window quickly is also described and analyzed.

关键词： IDES project stockpile stewardship parallel programming parallel algorithm Breathing-Time-Buckets large scale portable parallel simulator discrete event simulation work load performance modeling window termination architectural parameters Sandia National Laboratories synchronization protocol

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Conservative synchronization in object-oriented parallel battlefield discrete event simulations 97

Conservative synchronization in object-oriented parallel bat...

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： James B. Hiller Thomas C. Hartrum Department of Electrical and Computer Engineering School of Engineering Air Force Institute of Technology Wright-Patterson AFB OH

ISBN: (纸本)9780818679650

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： null message algorithm load imbalance conservative synchronization military computing spatially decomposed simulation simulation system design deadlock generic simulation attributes execution time savings parallel battlefield discrete event simulations logical correctness performance gain object-oriented simulation

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Stack-free process-oriented simulation 97

Stack-free process-oriented simulation

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： C. J. M. Booth D. I. Bruce Defence Evaluation and Research Agency St. Andrews Road Malvern WORCS WR14 3PS UK

ISBN: (纸本)9780818679650

The process interaction world view is widely used in the general simulation community for its expressive power, and is supported by most modern simulation languages. In parallel discrete event simulation, however, its use remains comparatively rare due to the perceived inefficiency (and difficulty) of parallel *** present a new implementation strategy for parallel process-oriented simulation languages. This innovative, semantics-based approach directly addresses two common concerns of such languages. By concentrating on the intrinsic threads of control, we avoid the proliferation of simulation objects (and their associated costs) that might result from a naive translation. More fundamentally, the primary costs associated with process-oriented languages -- those of context switching between stacks and, in an optimistic setting, of saving the state of these stacks -- are entirely eliminated since our explicit use of continuations avoids the need for stacks in the first place. We similarly obtain cheap and natural thread preemption.

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Dynamic load balancing strategies for conservative parallel simulations 97

Dynamic load balancing strategies for conservative parallel ...

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： Azzedine Boukerche Sajal K. Das Center for Research in Parallel and Distributed Computing Department of Computer Sciences University of North of Texas Denton TX

ISBN: (纸本)9780818679650

This paper studies the problem of load balancing for conservative parallel simulations for execution on a multicomputer. The synchronization protocol makes use of Chandy-Misra null-messages. We propose a dynamic load balancing algorithm which assumes no compile time knowledge about the workload parameters. It is based upon a process migration mechanism, and the notion of CPU-queue length, which indicates the workload at each *** examine two variations for the algorithm which we refer to as centralized and multi-level hierarchical methods, in the context of queueing network simulation of a torus. The torus was chosen because it of its many cycles aid in the formation of deadlock making it a stress test for any conservative synchronization protocols. Our experiments indicate that our dynamic load balancing schemes significantly reduce the run time of an optimized version of Chandy-Misra null message approach, and decreases by 30-40\% the synchronization overhead when compared to the use of a static partitioning algorithm. Significantly, the results obtained also indicate that the multi-level scheme always outperforms both the centralized load balancing approach and the static partitioning algorithm.

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Dag consistent parallel simulation: a predictable and robust conservative algorithm 97

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

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： Wentong Cai Emmanuelle Letertre Stephen J. Turner School of Applied Science Nanyang Technological University Singapore 639798 IFSIC Universié de Rennes I Campus de Beaulieu 35042 Rennes Cedex France and Dept. of Computer Science University of Exeter Exeter EX4 4PT U.K. Dept. of Computer Science University of Exeter Exeter EX4 4PT U.K.

ISBN: (纸本)9780818679650

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.

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Speculative parallel simulation with an adaptive throttle scheme 97

Speculative parallel simulation with an adaptive throttle sc...

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： Seng Chuan Tay Yong Meng Teo Siew Theng Kong Department of Information Systems & Computer Science National University of Singapore Lower Kent Ridge Road Singapore 119260

ISBN: (纸本)9780818679650

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 E (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.

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Optimistic distributed simulation based on transitive dependency tracking 97

Optimistic distributed simulation based on transitive depend...

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： Om P. Damani Yi-Min Wang Vijay K. Garg Dept. of Computer Sci. Uni. of Texas at Austin AT&T Labs-Research Murray Hill NJ Dept. of Elect. & Comp. Eng Uni. of Texas at Austin

ISBN: (纸本)9780818679650

In traditional optimistic distributed simulation protocols, a logical process (LP) receiving a straggler rolls back and sends out anti-messages. The 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 the authors' 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. They also present the similarities between the two areas of distributed simulation and distributed recovery. They show how the solutions for one area can be applied to the other area.

关键词： straggler logical process anti-messages transitive dependency information distributed recovery message tagging time warp simulation memory management transitive dependency tracking optimistic distributed simulation protocols rollback broadcasting optimistic distributed simulation process rollback dependency information

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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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distributed interactive simulation for synthetic forces

Distributed interactive simulation for synthetic forces

引用

Heterogeneous Computing workshop

作者： P. Messina S. Brunett D. Davis T. Gottschalk D. Curkendall L. Ekroot H. Siegel Center for Advanced Computing Research California Institute of Technology Pasadena CA USA The ALPHA Group Jet Propulsion Laboratory Pasadena CA USA

Interactive simulation of battles is a valuable tool for training. The behavior and movement of hundreds or thousands of entities (tanks, trucks, airplanes, missiles, etc.) is currently simulated using dozens or more workstations on geographically distributed LANs connected by WANs. The simulated entities can move, fire weapons, receive "radio" messages, etc. The terrain that they traverse may change dynamically, for example due to rains turning dirt roads into mud or bombs forming craters. Thus the entities need to receive frequent information about the state of the terrain and the location and state of other entities. Typically, information is updated several times a second. As the number of simulated entities grows, the number of messages that need to be sent per unit of time can grow to unmanageable numbers. One approach to reducing the number of messages is to keep track of what entities need to know about which other entities and only send information to the entities that need to know. For example, tanks in Germany need not know about a change of course of a ship in the Pacific. This technique for reducing messages is known as interest management. Caltech and its Jet Propulsion Laboratory have implemented a simulation of this type on several large-scale parallel computers, exploiting both the compute power and the fast messaging fabric of such systems. The application is implemented using a heterogeneous approach. Some nodes are used to simulate entities, some to manage a database of terrain information, some to provide interest management functions, and some to route messages to the entities that do need to receive the information. Some of these tasks require more memory than others, some require faster processing capability.

关键词： Power system management Weapons Computational modeling Concurrent computing Airplanes Missiles Workstations Fires Rain Turning

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State saving for interactive optimistic simulation 97

State saving for interactive optimistic simulation

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proceedings of the eleventh workshop on parallel and distributed simulation

作者： Steve Franks Fabian Gomes Brian Unger John Cleary Department of Computer Science University of Waikato Te Whare Wananga o Waikato Hamilton New Zealand and Department of Computer Science The University of Calgary 2500 University Drive N.W. Calgary Alberta T2N 1N4 Canada Department of Computer Science The University of Calgary 2500 University Drive N.W. Calgary Alberta T2N 1N4 Canada Department of Computer Science University of Waikato Te Whare Wananga o Waikato Hamilton New Zealand

ISBN: (纸本)9780818679650

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.

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