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

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Reducing the size of routing tables for large-scale network simulation 03

Reducing the size of routing tables for large-scale network ...

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： A. Hiromori H. Yamaguchi K. Yasumoto T. Higashino K. Taniguchi Graduate School of Engineering Science Osaka University Japan Graduate School of Information Science and Technology Osaka University Japan Graduate School of Information Science Nara Institute of Science and Technology Japan

ISBN: (纸本)9780769519708

In simulating large-scale networks, due to the limitation of available resources on computers, the size of the networks and the scale of simulation scenarios are often restricted. Especially, routing tables, which indicate the directions to forward packets, are considered to consume memory space. A simple general routing table requires O(N/sup 2/) space where N is the number of nodes. An algorithmic routing approach recently proposed by Heung et al. only requires O(N) space for representing routing tables, however this can be applied in the case that all the routes between two nodes are contained in a spanning tree (i.e. very limited routing strategies are allowed). We propose a new method to reduce the size of routing tables under any routing strategy. Given a general simple routing table, our method represents a routing table as the combination of an algorithmic routing based table and a general routing table, by translating a part of the given general routing table into the algorithmic routing based one. In order to reduce the size of the routing table, we find a (near-optimal)algorithmic routing based table that represents most part of the given routing table. Our experimental results have shown that our method could reduce the size of the table to 10 % of the given routing table in hierarchical networks.

关键词： Large-scale systems Computational modeling Computer simulation Computer networks Information science Space technology Concurrent computing Routing protocols Network servers Computer architecture

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Interest management in agent-based distributed simulations 03

Interest management in agent-based distributed simulations

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International workshop/Symposium on distributed simulation and Real-Time Applications (DS-RT)

作者： Lihua Wang S.J. Turner Fang Wang Parallel & Distributed Computing Centre Nanyang Technological University Singapore

ISBN: (纸本)9780769520360

distributed simulation enables participants situated in different geographical locations to share a common virtual world, which is called a distributed virtual environment (DVE). Among the different research topics concerned with DVE, there is a current trend of linking multi-agent systems and DVE together. With the properties of autonomy, social ability, reactivity and proactiveness, agents can be used to represent entities in DVE, where fast and accurate decision making is a determining factor of the whole environment. This paper provides a description of integrating agents into an HLA-based distributed simulation. It focuses on how to construct the sensor of an agent with different interest management schemes. Using the JADE (Java agent development framework) agent toolkit and the high level architecture (HLA) in our prototype, a minesweeping game, we outline two different implementations of this game. Due to the dynamic characteristics of agents, a problem of overdue information from the environment is discussed, and we propose an enlarged subscription region method to solve this problem. Moreover, advisories provided by the HLA are adopted to reduce the overheads. Conclusions are drawn based on the experimental results of these implementations.

关键词： Computational modeling Virtual environment Multiagent systems Java Game theory distributed computing Computer simulation Avatars Concurrent computing Joining processes

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Analysis of parallel downloading for large file distribution

Analysis of parallel downloading for large file distribution

引用

IEEE workshop on Future Trends of distributed Computing Systems

作者： S.G.M. Koo C. Rosenberg Dongyan Xu School of Electrical and Computer Engineering Purdue University West Lafayette IN USA Department of Computer Science Purdue University West Lafayette IN USA

Recently, the scheme of parallel downloading (PD) has been adopted by a number of Internet file downloading applications. With the wide deployment of content distribution networks and peer-to-peer networks, PD is expected to be more commonly used for file distribution. There have been experiments showing that PD results in higher aggregated downloading throughput and therefore shorter downloading time experienced by clients. However, these experimental studies focused on the performance experienced by a particular user and did not consider the impact of PD on the network when it is largely deployed. In this paper we present our efforts toward an in-depth understanding of large-scale deployment of PD through simulation and analysis. Our results suggest that while PD may achieve a shorter downloading time, its impact on the network and server is significant. Our analysis is also used for network dimensioning and content distribution service provisioning. We show that with proper admission control and dimensioning, single-server downloading can perform just as well as PD, without the complexity and overhead incurred by PD.

关键词： Network servers Analytical models Peer to peer computing Intelligent networks Throughput Tornadoes Concurrent computing Computer science Internet Application software

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The SPEEDES Persistence Framework and the Standard simulation Architecture 03

The SPEEDES Persistence Framework and the Standard Simulatio...

引用

proceedings of the seventeenth workshop on parallel and distributed simulation

作者： Dr. Jeffrey S. Steinman Jennifer W. Wong RAM Laboratories 10525 Vista Sorrento Parkway Suite 220 San Diego CA

ISBN: (纸本)9780769519708

This paper provides an overview of the SPEEDESpersistence framework that is currently used to automatecheckpoint/restart for the Joint simulation System. Thepersistence framework interfaces are documented in thispaper and are proposed standards for the Standardsimulation *** persistence framework fundamentally keeps trackof memory allocations and pointer references within ahigh-speed internal database linked with *** persistence, an object, and the collection of objectsit recursively references through pointers, can beautomatically packed into a buffer that is written to diskor sent as a message to another machine. Later, thatbuffer can be used to reconstruct the object and all of itsrecursively referenced objects. The reconstructed objectswill likely be instantiated at different memory *** persistence framework automatically updates allaffected pointer references to account for this *** persistence framework is fully integrated with theSPEEDES rollback infrastructure and built-in containerclass libraries that include an implementation of theStandard Template Library. These utilities automatesupport for optimistic event processing required by manyhigh-performance parallel and distributed timemanagement algorithms. In the future, persistence willenable dynamic load balancing algorithms to migratecomplex objects to different processors.

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PCI-DMA/CPU handoff for increased effectiveness of checkpointing functionalities in CCL 03

PCI-DMA/CPU handoff for increased effectiveness of checkpoin...

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International workshop/Symposium on distributed simulation and Real-Time Applications (DS-RT)

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

ISBN: (纸本)9780769520360

Checkpointing and Communication Library (CCL) is recently developed software in support of optimistic parallel discrete event simulation on myrinet clusters. Beyond low latency message delivery functionalities, CCL also offers non-blocking checkpointing functionalities supported by a programmable PCI DMA engine on board of myrinet cards. CCL employs resynchronization functionality between PCI DMA activities and CPU activities to maintain the consistency of checkpointed information (i.e. to prevent the CPU from updating information that still needs to be copied through DMAing). If re-synchronization is invoked before the checkpoint operation is completed, simulation activities carried out by the CPU may be forced to wait for checkpoint completion. Since data copy through the PCI DMA is slower than what achievable with the CPU, in pathological situations a re-synchronization period may last more than a whole checkpoint operation performed by the CPU, thus nullifying the potential benefit from offloading checkpointing from the CPU. This paper tackles such an issue by presenting the design and implementation of a handoff mechanism of checkpoint operations between PCI (Peripheral Component Interconnect) DMA (direct memory access)and CPU to enhance the effectiveness of checkpointing functionalities offered by CCL. Although a checkpoint operation is initially entrusted to the PCI DMA, whenever re-synchronization forces the simulation application to wait for its completion, the checkpoint operation is dynamically switched to the CPU, namely the fastest available device, since its timely completion has become a performance critical task for the simulation application.

关键词： Checkpointing Discrete event simulation Engines Synchronization Remuneration Software libraries Delay Pathology Clocks

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Maya: a Multi-Paradigm Network Modeling Framework 03

Maya: a Multi-Paradigm Network Modeling Framework

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proceedings of the seventeenth workshop on parallel and distributed simulation

作者： Junlan Zhou Zhengrong Ji Mineo Takai Rajive Bagrodia University of California Los Angeles Parallel Computing Laboratory 3809 Boelter Hall Los Angeles CA

ISBN: (纸本)9780769519708

This paper presents Maya, a multi-paradigm, scalableand extensible network modeling framework for emulatingdistributed applications. A novel three-tier architecture isproposed to integrate three disparate modeling paradigms,namely, discrete event models, analytical models and physicalnetwork interfaces into one unified framework of *** the first effort to integrate all three paradigms intoone framework, this paper discusses the implementationsof Maya using Qualnet, fluid flow based TCP model andphysical network interface. It addresses the performanceissues involved in attaining the real time constraints imposedby distributed applications and demonstrates the effectivenessof using analytical models in Maya. Furthermore, it identifies the negative impact on real time performance through the computation intensive ordinary differential equation (ODE) solver in the fluid flow model. A new approach to interleaved executions of the fluid flow model is proposed to hide ODE solver turnaround time. As a result, the percentage of packets missing their deadlines has been reduced from more than 6% to less than 0.2%.

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proceedings - 16th workshop on parallel and distributed simulation, PADS 2002

Proceedings - 16th Workshop on Parallel and Distributed Simu...

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16th workshop on parallel and distributed simulation, PADS 2002

ISBN: (纸本)0769516084

The proceedings contain 19 papers. The topics discussed include: conservative simulation using distributed-shared memory;the lookahead in a user-transparent conservative parallel simulator;addressing blocking and scalability in critical channel traversing;early cancellation: an active NIC optimization for time-warp;critical causality in distributed virtual environments;a scalable architecture for supporting interactive games on the Internet;evaluation of a sort-based matching algorithm for DDM;lookahead revisited in wireless network simulations;genesis: a system for large-scale parallel network simulation;experiences applying parallel and interoperable network simulation techniques in on-line simulations of military networks;updateable simulation of communication networks;and stone axes and warhammers: a decade of distributed simulation in aviation research.

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proceedings 16th workshop on parallel and distributed simulation

Proceedings 16th Workshop on Parallel and Distributed Simula...

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workshop on Principles of Advanced and distributed simulation (PADS)

The following topics are dealt with: conservative simulation using distributed shared memory; parallel simulation; optimistic simulation; virtual environments and HLA; network simulation; distributed simulation; and d...

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The lookahead in a user-transparent conservative parallel simulator 16

The lookahead in a user-transparent conservative parallel si...

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16th workshop on parallel and distributed simulation

作者： Solcany, V Safarik, J Slovak Univ Technol Bratislava Dept Comp Sci & Engn FEEIT Bratislava 81219 Slovakia

ISBN: (纸本)0769516084

One of the difficulties inherent to conservative parallel discrete event simulation (PDES) is the need for extraction and explicit specification of the lookahead. In this paper we propose a simulator design which allows users to build simulation models with lookahead transparently, This is based on the cooperation between PDES experts and the users, and on the reusability, of model components. We introduce the principal design of the simulator and give the results related to its lookahead.

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A load management system for running HLA-based distributed simulations over the grid 6

A load management system for running HLA-based distributed s...

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6th IEEE International workshop on distributed simulation and Real-Time Applications (DS-RT 2002)

作者： Cai, WT Turner, SJ Zhao, HF Nanyang Technol Univ Sch Comp Engn Parallel & Distributed Proc Lab Singapore 639798 Singapore

ISBN: (纸本)0769518532

Running a large-scale distributed simulation may need a large amount of computing resources at geographically different locations. These resources may be from different organizations. The simulation may run for a long period of time and the availability and the amount of computing resources available may change during the course of the simulation execution. Therefore, coordinating and managing the resources for distributed simulation to complete the simulation efficiently and effectively is a, critical issue. This paper describes a load management system for HLA-based distributed simulation. The system is constructed on top of a Grid Computing environment supported by Globus. The overall structure of the system is presented in the paper and how the system saves and restores a federate is also discussed in detail.

关键词： distributed simulation HLA load management system grid computing globus

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