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

共 1170 条记录，以下是271-280 订阅

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Maya: a multi-paradigm network modeling framework for emulating distributed applications 17

Maya: a multi-paradigm network modeling framework for emulat...

引用

17th workshop on parallel and distributed simulation

作者： Zhou, JL Ji, ZG Takai, M Bagrodia, R Univ Calif Los Angeles Parallel Comp Lab Los Angeles CA 90095 USA

ISBN: (纸本)0769519709

This paper presents Maya, a multi-paradigm, scalable and extensible network modeling framework for emulating distributed applications. A novel three-tier architecture is proposed to integrate three disparate modeling paradigms, namely, discrete event models, analytical models and physical network interfaces into one unified framework of Maya. As the first effort to integrate all three paradigms into one framework, this paper discusses the implementations of Maya using Qualnet, fluid flow based TCP model and physical network interface. It addresses the performance issues involved in attaining the real time constraints imposed by distributed applications and demonstrates the effectiveness of 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%.

关键词： Analytical models Application software Computer networks distributed computing Fluid flow Network interfaces parallel processing Scalability Telecommunication traffic Traffic control

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HLA-based adaptive distributed simulation of wireless mobile systems 17

HLA-based adaptive distributed simulation of wireless mobile...

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17th workshop on parallel and distributed simulation

作者： Bononi, L D'Angelo, G Donatiello, L Univ Bologna Dipartimento Sci Informaz I-40126 Bologna Italy

ISBN: (纸本)0769519709

Wireless networks' models differ from wired ones at least in the innovative dynamic effects of host-mobility and open-broadcast nature of the wireless medium. Topology changes due to simulated hosts' mobility map on causality effects in the "areas of influence" of each mobile device. The analysis of wireless networks Of interest today may include a potentially high number of simulated hosts, resulting in performance and scalability problems for discrete-event sequential simulation tools and methods, on a single physical execution unit (PEU). In a distributed simulation, the main bottleneck becomes the communication and synchronization required to maintain the causality constrains between distributed model components. In this work we propose a HLA-based, dynamic mechanism for the runtime management and allocation of model entities in a distributed simulation of wireless networks models, over a cluster of PEUs. By adopting a runtime evaluation of causal bindings between model entities we map the causal effects of virtual topology changes to dynamic migration of data structures. Preliminary results demonstrate that the prototype heuristics lead to a reduction in the percentage of external communication between the PEUs, limited overheads and performance enhancements for a worst-case scenario.

关键词： Analytical models Computational modeling Computer architecture Discrete event simulation Network topology Performance analysis Personal communication networks Runtime Scalability Wireless networks

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The SPEEDES persistence framework and the standard simulation architecture 17

The SPEEDES persistence framework and the standard simulatio...

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17th workshop on parallel and distributed simulation

作者： Steinman, JS Wong, JW RAM Labs San Diego CA 92121 USA

ISBN: (纸本)0769519709

This paper provides an overview of the SPEEDES persistence framework that is currently used to automate checkpoint/restart for the Joint simulation System. The persistence framework interfaces are documented in this paper and are proposed standards for the Standard simulation Architecture. The persistence framework fundamentally keeps track of memory allocations and pointer references within a high-speed internal database linked with applications. With persistence, an object, and the collection of objects it recursively references through pointers, can be automatically packed into a buffer that is written to disk or sent as a message to another machine. Later, that buffer can be used to reconstruct the object and all of its recursively referenced objects. The reconstructed objects will likely be instantiated at different memory locations. The persistence framework automatically updates all affected pointer references to account for this fact. The persistence framework is fully integrated with the SPEEDES rollback infrastructure and built-in container class libraries that include an implementation of the Standard Template Library. These utilities automate support for optimistic event processing required by many high-performance parallel and distributed time management algorithms. In the future, persistence will enable dynamic load balancing algorithms to migrate complex objects to different processors.

关键词： Buffer storage Containers Heuristic algorithms Laboratories Libraries Load management Network servers Object oriented databases Object oriented modeling Read-write memory

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Power-aware state dissemination in mobile distributed virtual environments 17

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

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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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Resource co-allocation for parallel tasks in computational grids

Resource co-allocation for parallel tasks in computational g...

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

作者： Wang, Lizhe Cai, Wentong Lee, Bu-Sung See, Simon Jie, Wei School of Computer Engineering Nanyang Technological University Singapore Sun Microsystems Inc. Singapore Institute of High Performance Computing Singapore

ISBN: (纸本)0769519849

Tasks running in computational Grids may require multiple types of resources simultaneously. Thus, co-allocation of multiple types of resources is needed when scheduling tasks. Traditional list scheduling heuristics cannot address the problem of resource co-allocation in computational Grids. This paper presents models for computational Grids and parallel tasks running in computational Grids. Based on these models, a parallel task scheduling algorithm for resource co-allocation in computational Grids is proposed. The algorithm identifies the critical resource of parallel tasks and tries to schedule a task as early as possible when all the resources required by the task are available. simulation results show that the algorithm can gain performance improvement, especially in the resource competitive computational Grid. © 2003 IEEE.

关键词： Scheduling algorithms

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