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International workshop on Wireless Network Algorithm and Theory

作者： Li, Jinbao Zhang, Desheng Guo, Longjiang School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China

ISBN: (纸本)9780769543222

To handle the triple hidden terminal problems, this paper proposes OCO, an asynchronous multi-channel MAC protocol with opportunistic cooperation for wireless sensor networks. By adopting opportunistic cooperation, OCO effectively alleviates, if not eliminates, the triple hidden terminal problems. More importantly, OCO is fully distributed with no requirements of time synchronization or multi-radio scheme, so it is easy to be implemented on the real sensor nodes. Via the theoretical analysis, the opportunistic probability that a node cooperates with its neighbor is obtained. To validate the effectiveness of opportunistic cooperation, extensive simulations and real testbed experiments were conducted. The simulation and experimental results show that when the number of channels is large or the network loads are heavy, OCO improves energy efficiency and throughput significantly compared with other works in the literature. © 2010 IEEE.

关键词： Sensor nodes

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Efficient Master/Worker parallel Discrete Event simulation 09

Efficient Master/Worker Parallel Discrete Event Simulation

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23rd International workshop on Principles of Advanced and distributed simulation

作者： Park, Alfred Fujimoto, Richard M. Georgia Inst Technol Computat Sci & Engn Div Atlanta GA 30332 USA

ISBN: (纸本)9780769537139

The master/worker (MW) paradigm can be used to implement parallel discrete event simulations (PDES) on metacomputing systems. MW PDES applications incur overheads not found in conventional PDES executions executing on tightly coupled machines. We introduce four techniques for reducing these overheads on public resource and desktop grid infrastructures Work unit caching, pipelined state updates, expedited message delivery, and adaptive work unit scheduling mechanisms are described that provide significant reduction in overall overhead when used in tandem. We present performance results showing that an optimized MW PDES system can exhibit performance comparable to a traditional PDES system for a queueing network and a particle physics simulation.

关键词： parallel discrete event simulation conservative synchronization caching PDES metacomputing volunteer computing grid computing simulation desktop grids Master/worker

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parallelizing SystemC Kernel for Fast Hardware simulation on SMP Machines 09

Parallelizing SystemC Kernel for Fast Hardware Simulation on...

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23rd International workshop on Principles of Advanced and distributed simulation

作者： Ezudheen, P. Chandran, Priya Chandra, Joy Simon, Biju Puthur Ravi, Deepak Natl Inst Technol Calicut Calicut Kerala India Intel Corp Santa Clara CA USA

ISBN: (纸本)9780769537139

SystemC is a system-level modeling language and simulation framework which facilitates design and verification of processor designs at different levels. Recently, SystemC is becoming a popular choice for designers of both System-On-Chip (SoC) and embedded processors, clue to its adaptability at cycle as well as transaction levels, and ability to model concurrent processes. However, the single threaded simulation kernel inherent to SystemC, prevents it froth utilizing the potential computing power of symmetric multiprocessing (SMP) machines to speed up hardware simulation. We present a parallel SystemC simulation kernel, which is implemented using parallel programming techniques and leverages the parallel execution capabilities of multi-core machines to speed up hardware simulation. We discuss the mechanism we use for mapping parallel SystemC modules into different cores. Finally we report the performance of the parallelized SystemC kernel using a linear pipelined performance model and a pipelined performance model tailored to exhibit the behavior of real world simulation. Our results demonstrate that the performance improvement obtained by using parallelized SystemC for simulation of the above models is significant and improves with increasing design complexity of the simulated design and the number of cores in the machine running the simulators.

关键词： SoC TLM SystemC Core affinity OSCI SMP

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GPU-based Real-Time Execution of Vehicular Mobility Models in Large-Scale Road Network Scenarios 09

GPU-based Real-Time Execution of Vehicular Mobility Models i...

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23rd International workshop on Principles of Advanced and distributed simulation

作者： Perumalla, Kalyan S. Aaby, Brandon G. Yoginath, Srikanth B. Seal, Sudip K. Oak Ridge Natl Lab Oak Ridge TN 37831 USA

ISBN: (纸本)9780769537139

A methodology and its associated algorithms are presented for mapping a novel, field-based vehicular mobility model onto graphical processing unit computational platform for simulating mobility in large-scale road networks. Of particular focus is the achievement of real-time execution, on desktop platforms, of vehicular mobility on road networks comprised of millions of nodes and links, and multi-million counts of simultaneously active vehicles. The methodology is realized in a system called GARFIELD, whose implementation details and performance study are described The runtime characteristics of a prototype implementation are presented that show real-time performance in simulations of networks at the scale of a few states of the US road networks.

关键词： GPUs parallel simulation Vehicular Mobility Models Transportation Networks

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distributed and parallel Admission Control for Core-stateless Networks

Distributed and Parallel Admission Control for Core-stateles...

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1st International workshop on Education Technology and Computer Science

作者： Shao, Huagang Chen, Xiao Shanghai Inst Technol Dept Comp Sci Shanghai 200235 Peoples R China Shanghai Jiao Tong Univ Shanghai 200030 Peoples R China

ISBN: (纸本)9780769535579

In this paper we propose a scalable admission control scheme for the QoS sensitivity traffic in core-stateless networks. In our scheme, the ingress routers perform admissibility test in a fully distributed and parallel fashion for requests by dint of our bandwidth dividing based virtual link mechanism. Then, we introduce a novel two phase token passing mechanism to adaptively optimize the proportion of bandwidth dividing among contending edge routers according to the dynamic of their traffic. In addition, we adopt a measurement based admission decision-making criterion to gain the benefit of high utilization of statistical multiplexing. Our simulation results are very promising indicating that even under very high request load it is possible to perform admission control and resource allocation in parallel without suffering in terms of response time, packet loss rate, or utilization.

关键词： Core-stateless Admission Control distributed parallel QoS

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2009 ACM/IEEE/SCS 23rd workshop on Principles of Advanced and distributed simulation, PADS '09

2009 ACM/IEEE/SCS 23rd Workshop on Principles of Advanced an...

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2009 ACM/IEEE/SCS 23rd workshop on Principles of Advanced and distributed simulation, PADS '09

ISBN: (纸本)9780769537139

The proceedings contain 18 papers. The topics discussed include: an approach for validation of semantic composability in simulation models;symbiotic simulation model validation for radiation detection applications;causal program slicing;a performance evaluation of the lightweight time warp protocol in optimistic parallel simulation of DEVS-based environmental model;scalable time warp on blue gene supercomputers;real-time security exercises on a realistic interdomain routing experiment platform;modeling and evaluation of rescue operations using mobile communication devices;parallelizing SystemC kernel for fast hardware simulation on SMP machines;GPU-based real-time execution of vehicular mobility models in large-scale road network scenarios;an efficient and adaptive mechanism for parallel simulation replication;and using REST web-services architecture for distributed simulation.

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proceedings of the 2009 workshop on Bio-inspired Algorithms for distributed Systems, BADS '09

Proceedings of the 2009 Workshop on Bio-inspired Algorithms ...

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2009 workshop on Bio-inspired Algorithms for distributed Systems, BADS '09

ISBN: (纸本)9781605585840

The proceedings contain 12 papers. The topics discussed include: characterizing fault tolerance in genetic programming;proactive information caching for efficient resource discovery in a self-structured grid;crystal-growth-inspired algorithms for computational grids;an innovative perspective on mapping in grids;a distributed ant-based algorithm for numerical optimization;evolutionary P2P network adaptively changing its topologies for reliable searching;an evaporative approach to handle dynamics in diffusive aggregation schemes;asynchronous simulation of a self-synchronized duty-cycling mechanism for mobile sensor networks;power-efficient epidemic information dissemination in sensor networks;swarm intelligence based energy saving and load balancing in wireless ad hoc networks;high performance genetic programming on GPU;and fastest parallel molecular algorithms for the elliptic curve discrete logarithm problem over GF(2n).

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Sequence-preserving parallel IP lookup using multiple SRAM-based pipelines

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JOURNAL OF parallel AND distributed COMPUTING 2009年第9期69卷 778-789页

作者： Jiang, Weirong Prasanna, Viktor K. Univ So Calif Ming Hsieh Dept Elect Engn Los Angeles CA 90089 USA

SRAM (static random access memory)-based pipelined algorithmic solutions have become competitive alternatives to TCAMs (ternary content addressable memories) for high-throughput IP lookup. Multiple pipelines can be utilized in parallel to improve the throughput further. However, several challenges must be addressed to make such solutions feasible. First, the memory distribution over different pipelines, as well as across different stages of each pipeline, must be balanced. Second, the traffic among these pipelines should be balanced. Third, the intra-flow packet order (i.e. the sequence) must be preserved. In this paper, we propose a parallel SRAM-based multi-pipeline architecture for IP lookup. A two-level mapping scheme is developed to balance the memory requirement among the pipelines as well as across the stages in each pipeline. To balance the traffic, we propose an early caching scheme to exploit the data locality inherent in the architecture. Our technique uses neither a large reorder buffer nor complex reorder logic. Instead, a flow-aware queuing scheme exploiting the flow information is used to maintain the intra-flow sequence. Extensive simulation using real-life traffic traces shows that the proposed architecture with 8 pipelines can achieve a throughput of up to 10 billion packets per second, i.e. 3.2 Tbps for minimum size (40 bytes) packets, while preserving intra-flow packet order. (c) 2009 Elsevier Inc. All rights reserved.

关键词： IP lookup Pipeline SRAM Router

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Congestion Control Algorithm based on Loss Trend Oriented to Many-to-many Reliable Multicast

Congestion Control Algorithm based on Loss Trend Oriented to...

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3rd International workshop on e-Activity (IWEA2009)/10th ACIS International Conference on Software Engineering Artificial Intelligence, Networking and parallel/distributed Computing

作者： Liu Li Zhou Zhong Liu Dongmei Wu Wei State Key Lab Virtual Real Technol & Syst Beijing 100191 Peoples R China Beihang Univ Sch Comp Sci & Engn Beijing 100191 Peoples R China

ISBN: (纸本)9780769536422

Congestion control algorithms of existing reliable multicast protocols are mainly derived from end-to-end model, which has high resource requirements and sometimes suppresses the package sending too much. Many-to-many reliable multicast requires efficient congestion control over a one-to-many model. It's an important mechanism to use many-to-many multicast in LAN (Local Area Network) in distributed simulation. In this paper, a congestion control algorithm based on loss trend for many-to-many reliable multicast is proposed. It predicts future package loss of receivers on the analysis of historic loss and buffer variety, and then control the congestion by adjusting the sending rate in advance. This algorithm aims at the reliable multicast in LAN. The main idea of the algorithm is to lower the possibility of multicast package loss, and then the nodes can afford the cost of package recovery. It alleviates the congestion on the depression of package loss possibility by regulating the sending rate. Experiment results indicate that the algorithm can keep a high throughput of many-to-many reliable multicast with relatively real-time performance.

关键词： many-to-many reliable multicast congestion control distributed simulation

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Eurographics Symposium on parallel Graphics and Visualization, EGPGV 2009

Eurographics Symposium on Parallel Graphics and Visualizatio...

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9th Eurographics Symposium on parallel Graphics and Visualization, EGPGV 2009

ISBN: (纸本)9783905674156

The proceedings contain 14 papers. The topics discussed include: time-constrained high-fidelity rendering on local desktop grids;interactive physical simulation on multicore architectures;dynamic grid refinement for fluid simulations on parallel graphics architectures;simulation of radio wave propagation by beam tracing;parallelized matrix factorization for fast BTF compression;parallelized matrix factorization for fast BTF compression;fast parallel unbiased diffeomorphic atlas construction on multi-graphics processing units;a flexible adaptation service for distributed rendering;wait-free shared-memory irradiance cache;data-parallel hierarchical link creation for radiosity;and a decomposition approach for optimizing large-scale parallel image composition on multi-core MPP systems.

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