The proceedings contain 23 papers from the conference on the 18th workshop on parallel and distributedsimulation, PADS 2004. The topics discussed include: simulation validation using direct execution of wireless ad-h...
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ISBN:
(纸本)0769521118
The proceedings contain 23 papers from the conference on the 18th workshop on parallel and distributedsimulation, PADS 2004. The topics discussed include: simulation validation using direct execution of wireless ad-hoc routing protocols;detailed OFDM modeling in network simulation of mobile ad-hoc networks;event reconstruction in time warp;just-in-time cloning;towards grid-aware time warp;and the effect of detail on ethernet simulation.
Copyright and Reprint Permissions: Abstracting is permitted with credit to the source. Libraries may photocopy beyond the limits of US copyright law, for private use of patrons, those articles in this volume that carr...
Copyright and Reprint Permissions: Abstracting is permitted with credit to the source. Libraries may photocopy beyond the limits of US copyright law, for private use of patrons, those articles in this volume that carry a code at the bottom of the first page, provided that the per-copy fee indicated in the code is paid through the Copyright Clearance Center. The papers in this book comprise the proceedings of the meeting mentioned on the cover and title page. They reflect the authors' opinions and, in the interests of timely dissemination, are published as presented and without change. Their inclusion in this publication does not necessarily constitute endorsement by the editors or the Institute of Electrical and Electronics Engineers, Inc.
If a model shall be executed in a parallel, distributed instead of a sequential manner typically the entire simulation engine has to be exchanged. To adapt the simulation layer more easily to the requirements of a con...
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ISBN:
(纸本)0769521118
If a model shall be executed in a parallel, distributed instead of a sequential manner typically the entire simulation engine has to be exchanged. To adapt the simulation layer more easily to the requirements of a concrete model to be run in a specific environment a component based simulation layer has been developed for JAMES. A set of different simulator components demonstrates that a component-based design facilitates the exchange of simulators and their combination.
parallelsimulation and distributedsimulation sometimes appear to be two different worlds. Where parallelsimulation aims at increasing the speed of a single model by distributing it over more processors, distributed...
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ISBN:
(纸本)0769521118
parallelsimulation and distributedsimulation sometimes appear to be two different worlds. Where parallelsimulation aims at increasing the speed of a single model by distributing it over more processors, distributedsimulation looks at ways to link entire models or federates that run on different computers. In the case of distributedsimulation, the models themselves are hard to distribute, and often they each run on one processor as a monolithic model. This paper advocates to build the more traditional simulation models in such a way, that they can be easily distributed. As simulationists, we can learn from component-based theory from the software engineering field to prepare our models for distribution, and parts of our models for reuse. The results of several projects show that componentizing simulation models can have many advantages. The results also show that it is not easy to create models in a componentized way, and that current methods for simulation model building should be adapted.
Time-parallelsimulation offers the potential of massive parallelization of a simulation application, due to the amount of achievable parallelism not being restricted by the decomposability of the state space of a sim...
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ISBN:
(纸本)0769521118
Time-parallelsimulation offers the potential of massive parallelization of a simulation application, due to the amount of achievable parallelism not being restricted by the decomposability of the state space of a simulation model. Unfortunately, the potential speedup of a time-parallelsimulation highly depends on the ability to match final and initial states of adjacent time intervals. Depending on the properties of the underlying simulation model, it might be feasible to accept a simulation iteration, even if the states of adjacent time intervals do not match exactly. This leads to the concept of approximative state matching in time-parallelsimulation, which is introduced in this paper Experiments with a prototypical implementation of a simple simulation model show encouraging results in terms of simulation speedup and introduced error.
With parallel and Discrete Event simulation (PDES) techniques, the runtime performance of detailed wireless network simulation can be improved significantly without compromising fidelity of the simulation results. How...
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ISBN:
(纸本)0769521118
With parallel and Discrete Event simulation (PDES) techniques, the runtime performance of detailed wireless network simulation can be improved significantly without compromising fidelity of the simulation results. However modelling characteristics of wireless communications such as signal propagation and interference may severely hinder the potential speedup yielded by PDES. This paper proposes various optimization techniques to address three major concerns in achieving efficient parallel execution of wireless network simulation: i.e., (1) reducing communication and computation overhead of simulating signal propagation across multiple logical processes;(2) reducing synchronization overhead among logical processes;(3) minimizing event scheduling overhead within individual logical processes. These techniques have been implemented in a parallel version of GloMoSim and QualNet. The experimental results with mobile ad hoc networking scenarios demonstrate that the proposed optimization techniques can improve the performance of parallel wireless network simulation by up to an order of magnitude.
The parallel (and distributed) Discrete Event simulation (PADS) community - over it's more than 20 years of existence has achieved remarkable results in getting the execution of simulations of discrete event syste...
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ISBN:
(纸本)0769521118
The parallel (and distributed) Discrete Event simulation (PADS) community - over it's more than 20 years of existence has achieved remarkable results in getting the execution of simulations of discrete event systems faster, involving multiple, logically and/or physically dispersed, communicating computational resources. A solid, mature and empirically approved body of foundational concepts, models, systems, methods and algorithms are at hand and well documented in more than 50.000 pages of research papers. PADS simulation engines, model and software libraries, and operating systems have proven feasibility and applicability of these results in solving real world problems. Despite the (healthy) self-criticism of it's proponents ("Will the field survive?"), PADS was - and is - a success! With this talk we aim at a prospect for the challenges posed by the emerging new models of computational and communication, the evolving new paradigms of interaction and coordination, the new styles of system design, and even the availability of new technologies, for which - in my opinion - no other community qualifies better than the PADS community.
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