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7th International workshop on Systems and Network Telemetry and Analytics (SNTA)

作者： Cafaro, Massimo Epicoco, Italo Pulimeno, Marco Univ Salento Lecce Italy

ISBN: (纸本)9798400706486

In this paper we deal with the problem of monitoring network latency. Indeed, latency is a key network metric related to both network performance and Quality of Service, since it directly impacts on the overall user's experience. High latency leads to unacceptably slow response times of network services, and may increase network congestion and reduce the throughput, in turn disrupting communications and the user's experience. A common approach to monitoring network latency takes into account the frequently skewed distribution of latency values, and therefore specific quantiles are monitored, such as the 95th, 98th, and 99th percentiles. We present a parallel, message-passing based version of the FRUGAL algorithm that can be used for monitoring network latency quickly and accurately. A distributed version is also discussed.

关键词： Latency Quantile Stream parallel Computing distributed Computing

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proceedings of the 1995 7th IEEE Symposium on parallel and distributed Processing

Proceedings of the 1995 7th IEEE Symposium on Parallel and D...

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proceedings of the 1995 7th IEEE Symposium on parallel and distributed Processing

the proceedings contains 96 papers. Topics discussed include distributed computing, scheduling, parallel processing systems, routing, data communication systems, algorithms, computer architecture, processor allocation, interconnection networks, computer operating systems, data structures, program compilers, parallel programming, mapping techniques in computer systems, performance evaluation, input/output systems, computer simulation, fault tolerance and detection.

关键词： parallel processing systems

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Node-disjoint multipath routing and distributed cross-layer QoS guarantees in mobile ad hoc networks

Node-disjoint multipath routing and distributed cross-layer ...

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7th ACIS International Conference on Software Engineering, Artificial Intelligence, Networking, and parallel and distributed Computing/7th ACIS International workshop on Self-Assembling Networks

作者： Li, Xuefei Cuthbert, Laurie Queen Mary Univ London Dept Elect Engn London England

ISBN: (纸本)076952611X

In this paper, a novel distributed Cross-Layer QoS (DCLQ) architecture based on node disjoint multipath routing is proposed to provide QoS guarantees for realtime traffic and best-effort traffic in mobile ad hoc networks. Without any extra control overhead, DCLQ can schedule packets of real-time flows according to their perhop QoS requirements. DCLQ implements per-hop delay QoS-aware priority scheduling and QoS consideration of IvMC layer to ensure that real-timeflows and best-effort flows can achieve their desired service level.

关键词： Routers

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TributaryPCA: distributed, Streaming PCA for In Situ Dimension Reduction with Application to Space Weather simulations 7

TributaryPCA: Distributed, Streaming PCA for In Situ Dimensi...

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7th International workshop on Data Analysis and Reduction for Big Scientific Data (DRBSD)

作者： Wang, Yu Klein, Natalie Morley, Steven Jordanova, Vania Henderson, Michael Biswas, Ayan Lawrence, Earl Univ Michigan Ann Arbor MI 48105 USA Los Alamos Natl Lab Los Alamos NM 87545 USA

ISBN: (纸本)9781728186726

Computer simulations continue to grow in size and complexity and are moving towards exascale. simulations at this scale can generate outputs that exceed both storage capacity and the bandwidth available for transferring to storage, making traditional offline statistical inference challenging. therefore, it is desirable to embed statistical analyses in the simulation framework while the simulation is running - a strategy called in situ inference - to alleviate the burden of storage. In this work, we focus on adapting Principal Component Analysis (PCA) - a statistical method for reducing dimensionality of big data - to the in situ setting. We develop TributaryPCA: a distributed version of Oja's algorithm for streaming PCA that uses the Message Passing Interface (MPI) standard. Our approach significantly reduces data storage requirements of offline PCA and avoids excessive communication across compute nodes. We illustrate the method using data generated from the SHIELDS Framework for space weather simulation.

关键词： Dimension reduction distributed data In situ inference Principal component analysis Space weather

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A simulation model of task cluster scheduling in distributed systems 7

A simulation model of task cluster scheduling in distributed...

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7th IEEE workshop on Future Trends of distributed Computing Systems, FTDCS 1999

作者： Karatza, Helen D. Department of Informatics Aristotle University of Thessaloniki Thessaloniki54006 Greece

ISBN: (纸本)076950468X

this paper addresses issues of task clustering-the coalition of several fine grain tasks into single coarser grain tasks called task clusters-and task cluster scheduling on distributed processors. the performance of various scheduling schemes is studied and compared for a variety of workloads. simulation results indicate that the scheduling policy that gives priority to the cluster with the smallest cumulative service demand of all its tasks performs better than the other policies examined. © 1999 IEEE.

关键词： Scheduling

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Statistical methodology for WEB-based simulation 7

Statistical methodology for WEB-based simulation

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

作者： Biles, WE Kleijnen, JPC Univ Louisville Dept Ind Engn Louisville KY 40292 USA

ISBN: (纸本)0769520367

this paper describes a procedure for assigning simulation trials to a set of parallel processors for the purpose of conducting a simulation study, involving a complex simulation model, in near real time. Unlike distributed simulation, where a complex simulation model is decomposed and its parts run in a parallel environment, the parallel replications approach discussed here involves running simulation replications to completion for the entire model. the unique element here is that the workload involved in running the simulation study is too time consuming to execute on a single workstation, so that the simulation analyst must utilize computer resources available through the web. New statistical methodology is needed for running a complex simulation study in a web-based, parallel replications environment.

关键词： Analytical models Computational modeling Computer simulation Industrial engineering Information systems Lifting equipment Predictive models Real time systems Statistical analysis Workstations

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Adaptive Time Warp simulation of timed Petri nets

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IEEE TRANSACTIONS ON SOFTWARE ENGINEERING 1999年第2期25卷 237-257页

作者： Ferscha, A Univ Vienna Inst Angew Informat A-1080 Vienna Austria

Time Warp (TW), although generally accepted as a potentially effective parallel and distributed simulation mechanism for timed Petri nets, can reveal deficiencies in certain model domains. Particularly, the unlimited optimism underlying TW can lead to excessive aggressiveness in memory consumption due to saving state histories, and waste of CPU cycles due to overoptimistically progressing simulations that eventually have to be "rolled back" Furthermore, in TW simulations executing in distributed memory environments,the communication overhead induced by the rollback mechanism can cause pathological overall simulation performance. In this work, an adaptive optimism control mechanism for TW is developed to overcome these shortcomings. By monitoring and statistically analyzing the arrival processes of synchronization messages, TW simulation progress is probabilistically throttled based on the forecasted timestamp of forthcoming messages. Two classes of arrival process characterizations are studied, reflecting that a natural tradeoff exists among the computational and space complexity, and the respective prediction accuracy: While forecasts based on metrics of central tendency are computationally cheap but yield inadequate predictions for correlated arrivals (thus negatively affecting performance), time series based forecast methods give higher prediction accuracy, but at higher computational cost. the sensitivity of the adaptive optimism control with respect to forecast accuracy and computational overhead is analyzed for very large Petri net simulation models executed with the TW protocol on the Meiko CS-2 multiprocessor, and for a stress case scenario on the CM-5. Empirical evidence is delivered showing that: 1) probabilistic optimism control, regardless of the communication-computation speed ratio of the target execution platform, automatically finds the most appropriate synchronization policy in the spectrum between optimistic TW and conservative Chandy/Misra/Bryant

关键词： adaptive distributed simulation Petri nets Time Warp optimism control CS-2 CM-5

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An open interface for parallelization of traffic simulation 7

An open interface for parallelization of traffic simulation

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

作者： Igbe, D Kalantery, N Ijaha, S Winter, S Univ Westminster Ctr Parallel Comp London W1W 6UW England

ISBN: (纸本)0769520367

In this paper, we present the implementation of a parallel road traffic. simulation using the concept of Lane Cut Points (LCPs) in the Spider programming environment. LCPs are storage buffers inserted into lane data structures at the road network partition edges. Vehicles enter a partition at the edges from an LCP and exit a partition edge into an LCP at the end of every simulation. step. Spider, a parallel programming environment, which runs on PVM, coordinates the execution of the parallel traffic simulation.

关键词： Buffer storage Computational modeling Costs Data structures Microscopy Roads Scalability Telecommunication traffic Traffic control Vehicles

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A distributed Algorithm for Two-Way Multiple-Relay Networks

A Distributed Algorithm for Two-Way Multiple-Relay Networks

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IEEE 7th Sensor Array and Multichannel Signal Processing workshop (SAM)

作者： Lameiro, C. Via, J. Santamaria, I. Univ Cantabria Commun Engn Dept DICOM E-39005 Santander Spain

ISBN: (纸本)9781467310710

In this paper we propose an efficient transmission strategy for the two-way relay channel (TWRC) with multiple relays, when these are multiple-input multiple-output (MIMO) transceivers that apply the amplify-and-forward (AF) protocol. Although the optimal beamforming strategy is known, it requires a central node, with channel state information (CSI) of the entire network, to compute all the beamforming matrices, which is impractical. To reduce the overhead, in this paper we present a distributed algorithm for the computation of the relay beamforming matrices. the proposed algorithm divides the problem in two stages. First, each relay computes its own beamforming matrix in parallel using only local CSI. Next, a distributed beamforming is applied to make the signals add up coherently at the nodes. Although the proposed algorithm is suboptimal, we show through simulations that it performs very close to the optimal achievable rate region.

关键词： Amplify-and-forward (AF) distributed beamforming multiple-input multiple-output (MIMO) two-way relay channel (TWRC)

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A framework for executing parallel simulation using RTI 7

A framework for executing parallel simulation using RTI

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

作者： Yuan, ZJ Cai, WT Low, MYH Nanyang Technol Univ Sch Comp Engn Parallel & Distributed Comp Ctr Singapore 639798 Singapore

ISBN: (纸本)0769520367

the Grid enables large-scale resource sharing and makes it viable for running large-scale parallel and distributed simulations. the High Level Architecture (HLA) paradigm provides a software platform and interoperability interface for simulation components to utilize these hardware resources. However, neither the Grid nor the HLA provides mechanism for resource management for parallel and distributed simulations. It is also noticed that substantial effort is required for writing program that conforms to the Runtime Infrastructure (RTI) requirements because of its complexity. In this paper, we introduce a framework for designing and executing parallel simulation using the RTI. the framework is also designed to assist load balancing and checkpointing. With the code library from our framework, the modeler is able to complete the design of a parallel simulation that runs on RTI by specifying the simulation configuration and the handling detail of each event. Our framework incorporates automatic code generation. It also uses Data Distribution Management to route simulation events (interactions) to achieve efficient use of network bandwidth.

关键词： HLA DDM federate model parallel simulation code generation Java

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