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

共 1360 条记录，以下是331-340 订阅

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Power-aware state dissemination in mobile distributed virtual environments 17

Power-aware state dissemination in mobile distributed virtua...

引用

17th workshop on parallel and distributed simulation

作者： Shi, WD Perumalla, K Fujimoto, R Georgia Inst Technol Coll Comp Atlanta GA 30332 USA

ISBN: (纸本)0769519709

In distributed simulations, such as multi-player distributed virtual environments (DVE), power consumption traditionally has not been a major design factor. However, emerging battery-operated mobile computing platforms require revisiting DVE implementation approaches for maximizing power efficiency. In this paper we explore some implications of power considerations in DVE implementation over mobile handhelds connected by wireless networks. We focus on the state dissemination problem in DVEs and propose a new power-aware dead reckoning framework for power-efficient state dissemination. We highlight a fundamental tradeoff between state consistency and power consumption, and present an adaptive dead reckoning algorithm that attempts to dynamically optimize the tradeoff at runtime. We present a quantitative evaluation of our approach using a synthetic DVE benchmark application.

关键词： Batteries Computational modeling Dead reckoning Energy consumption Mobile computing Network interfaces Personal digital assistants Power measurement Virtual environment Wireless networks

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parallel Adaptive Mobile Web Clipping 03

Parallel Adaptive Mobile Web Clipping

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proceedings of the Sixth ACM International workshop on Modeling, Analysis and simulation of Wireless and Mobile Systems, MSWiM 2003

作者： Vrenios, Alexander Distributed Systems Research Lab 1565 E. Marconi Ave. Phoenix AZ 85022 United States

We describe a unique approach to improving the performance of a Web clipping portal by exploiting inherent parallelism in the syntax of widely used markup languages, and by employing a parallel computing platform as a... 详细信息

ISBN: (纸本)1581137664

关键词： World Wide Web

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proceedings of the International workshop on Challenges of Large Applications in distributed Environments, CLADE 2003

Proceedings of the International Workshop on Challenges of L...

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International workshop on Challenges of Large Applications in distributed Environments, CLADE 2003

ISBN: (纸本)0769519849

The proceedings contain 16 papers. The topics discussed include: distributed parallel computing using windows desktop systems;a load balancing tool for distributed parallel loops;a diskless checkpointing algorithm for super-scale architectures applied to the fast Fourier transform;dynamic replication to improve input/output scalability of genomic alignment;towards a grid-based architecture for traditional Chinese medicine;towards a grid-based architecture for traditional Chinese medicine;issues in runtime algorithm selection for grid environments;resource co-allocation for parallel tasks in computational grids;scalable state replication with weak consistency;runtime support for changing the communication model in large scale applications;impact of admission and cache replacement policies on response times of jobs on data grids;and distributing simulation work based on component activity: a new approach to partitioning hierarchical DEVS models.

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Hybrid Packet/Fluid flow network simulation 17

Hybrid Packet/Fluid flow network simulation

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17th workshop on parallel and distributed simulation

作者： Kiddle, C Simmonds, R Williamson, C Unger, B Univ Calgary Dept Comp Sci Calgary AB T2N 1N4 Canada

ISBN: (纸本)0769519709

Packet-level discrete-event network simulators use an event to model the movement of each packet in the network. This results in accurate models, but requires that many events are executed to simulate large, high bandwidth networks. Fluid-based network simulators abstract the model to consider only changes in rates of traffic flows. This can result in large performance advantages, though information about the individual packets is lost making this approach inappropriate for many simulation and emulation studies. This paper presents a hybrid model in which packet flows and fluid flows coexist and interact. This enables studies to be performed with background traffic modeled using fluid flows and foreground traffic modeled at the packet level. Results presented show up to 20 times speedup using this technique. Accuracy is within 4% for latency and 15% for jitter in many cases.

关键词： network simulation simulation abstraction techniques fluid simulation scalable network simulation

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Utility analysis of parallel simulation 17

Utility analysis of parallel simulation

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17th workshop on parallel and distributed simulation

作者： Nicol, DM Dartmouth Coll Hanover NH 03755 USA

ISBN: (纸本)0769519709

parallel computers are used to execute discrete-event simulations in contexts where a serial computer is unable to provide answers fast enough, and/or is unable to hold the simulation state in memory. Traditional research in parallel simulation has focused on the degree to which a parallel simulator provides speedup. This paper takes a different view and asks how a parallel simulator provides increased user defined utility as a result of being able to simulate larger problem sizes. We develop a model where the utility of simulating a particular simulation is an increasing function of the problem size, and ask whether overall utility accrues faster on a parallel computer if one uses it to simulate one large problem in parallel, several smaller problem instances concurrently and each in parallel, or concurrently many small problem instances on single processors. We show that under our model assumptions, utility is accrued faster either by running one large problem instance in parallel using all the available processors, or by running one small problem instance per processor, concurrently. When we consider how to optimize the utility per unit cost we find that one either runs a large problem using all available processors, multiple small problems with one per processor or a small problem using exactly one processor Determination of the optimal configuration depends on the user's assessment of how rapidly utility grows with the problem size. Our main contribution is to show the linkage between the effectiveness of parallel simulation and a user's perception of the value of larger problem sizes. We show that if that utility grows less than linearly in the problem size, then use of parallelism is sub-optimal. We give precise relationships between our model parameters that govern when parallelism optimizes utility, and when it optimizes price-performance. We see that when model parameters are in a "normal" range, a user's perception of utility must grow significantly-e.g.

关键词： Analytical models Computational modeling Computer simulation Concurrent computing Context modeling Cost function Couplings Discrete event simulation Educational institutions parallel processing

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CCL v3.0: Multiprogrammed semi-asynchronous checkpoints 17

CCL v3.0: Multiprogrammed semi-asynchronous checkpoints

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17th workshop on parallel and distributed simulation

作者： Quaglia, F Santoro, A Univ Roma La Sapienza Dipartimento Informat & Sistemist I-00198 Rome Italy

ISBN: (纸本)0769519709

CCL (Checkpointing and Communication Library) is a recently developed software in support of optimistic parallel simulation on myrinet based clusters. Beyond classical low latency message delivery functionalities, this library implements CPU offloaded, semi-asynchronous checkpointing functionalities based on data transfer capabilities provided by a programmable DMA engine on board of myrinet network cards. The latest version of CCL (v2.4), designed for M2M-PCI32C myrinet cards, only supports monoprogrammed semi-asynchronous checkpoints. This forces re-synchronization between CPU and DMA activities each time a new checkpoint request must be issued at the simulation application level while the last issued one is still being carried out by the DMA engine. In this paper we present CCL v3.0 that, exploiting hardware features of more advanced M3M-PCI64C myrinet cards, supports multiprogrammed semi-asynchronous checkpoints. The multiprogrammed approach allows higher degree of concurrency between checkpointing and other simulation specific operations carried out by the CPU, with obvious benefits on performance. We also report the results of the evaluation of those benefits for the case of a personal communication system simulation application.

关键词： Checkpointing Concurrent computing Costs Delay Discrete event simulation Engines Hardware Reduced instruction set computing Remuneration Software libraries

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Implementation of a collaborative web-based simulation modeling environment 7

Implementation of a collaborative web-based simulation model...

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7th International Symposium on distributed simulation and Real-Time Applications

作者： Wang, YH Liao, YC Tatung Univ Dept Informat Management Taipei Taiwan

ISBN: (纸本)0769520367

In view of the fact that communication and interaction are major factors to the success of a simulation project, this paper presents an integrated architecture with group communication and model design which is implemented to form a collaborative Web-based DEVS (Discrete Event System Specification) simulation environment over the Internet. Our system shows a paradigm-shifting activity to differ from the so-called one-person-alone Web-based simulation. During the entire modeling process the system will utilize an XML document and present its corresponding DEVS digraph-model applet and model code frame so that users in different places could view the same model and exchange their opinions and comments at the same time thus producing better result. This paper also demonstrates our implementation with a modeling example to illustrate how group interaction is to facilitate and improve the Web-based model design.

关键词： Collaboration Collaborative work Computational modeling Discrete event simulation Discrete event systems Information management Internet Java Power system modeling XML

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proceedings seventh IEEE International Symposium on distributed simulation and Real-Time Applications

Proceedings Seventh IEEE International Symposium on Distribu...

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

The following topics are dealt with: high level architecture (HLA) and grid issues; real time systems; quality of service (QoS) and multimedia; parallel and distributed simulation; methodology and Web-based simulation... 详细信息

关键词： Real time systems Multimedia computing parallel processing Internet Virtual reality Collaborative work

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Performance evaluation of the managed bandwidth service with QoS guarantees 7

Performance evaluation of the managed bandwidth service with...

引用

7th International Symposium on distributed simulation and Real-Time Applications

作者： Bouras, C Kapoulas, V Primpas, D Comp Technol Inst Patras 26221 Greece

ISBN: (纸本)0769520367

This paper describes a solution to extend the Managed Bandwidth Service (MBS), which is provided on a backbone network using MPLS VPNs, to non-MPLS domains and also evaluates it. It is based on the Class Based Weighted Fair Queueing mechanism (CBWFQ) [4] and describes the way it should be implemented to provide guaranteed bandwidth connections. In particular, CBWFQ can provide assured bandwidth connections when simultaneously leads to efficient bandwidth utilization. In addition, the proposed solution is being tested on simulation environment (using the Network Simulator) in order to evaluate its performance characteristics. On the simulation tests had been reserved specific amount of bandwidth for specific flows and their throughput was measured in order to understand if the proposed solution works well. Finally, the results are very well and prove that this method can guarantee bandwidth for every flow in all network conditions (congested or uncongested). At last, the paper presents a technical example of router configuration for implementing the MBS service according to the basic proposed solution.

关键词： managed bandwidth service quality of service simulation performance evaluation

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PCI-DMA/CPU handoff for increased effectiveness of checkpointing functionalities in CCL 7

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

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7th International Symposium on distributed simulation and Real-Time Applications

作者： Santoro, A Quaglia, F Univ Roma La Sapienza Dipartimento Informat & Sistemist I-00198 Rome Italy

ISBN: (纸本)0769520367

Checkpointing and Communication Library (CCL) is a 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 a re-synchronization 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 DMA 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 Clocks Delay Discrete event simulation Engines Pathology Remuneration Software libraries Synchronization

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