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Distributed ONE: scalable parallel network simulation 13

Distributed ONE: scalable parallel network simulation

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Proceedings of the 6th International ICST Conference on simulation Tools and Techniques

作者： Vedavyas Duggirala Calvin J. Ribbens Srinidhi Varadarajan Virginia Tech Dell Inc.

ISBN: (纸本)9781450324649

In this paper we describe a distributed-memory parallel implementation of the Open network Emulator (ONE), a network simulator that combines the controllability of simulation with the direct code execution advantages of emulation and experimental testbeds. ONE uses a scaled real-time model called Relativistic Time (RT). We describe a RT-based reactive global warp detection algorithm to exploit lookahead. The Distributed ONE system provides a platform for network simulation that combines model fidelity (existing network applications can be compiled and instantiated within ONE without modification), temporal fidelity, and good scalability. We present strong and weak scaling performance results for the Distributed ONE system on up to sixteen nodes of a distributed-memory parallel cluster, on simulations involving up to 16,000 virtual hosts.

关键词： time dilation parallel network simulation relativistic time parallel discrete event simulation

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A parallel network simulation PARTITIONING ALGORITHM IN THE COMPLEX PHYSICAL COMPUTING ENVIRONMENT

A PARALLEL NETWORK SIMULATION PARTITIONING ALGORITHM IN THE ...

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2012 IEEE 2nd International Conference on Cloud Computing and Intelligence Systems

作者： Xiangzhan Yu Zhaoxin Zhang Dan Liu School of Computer Science and Technology Harbin Institute of Technology IBM China Design Center

Traditional topology partition of parallel network simulation usually uses topology graph partition, that is to induce actual network simulate task to a weighted graph, Then use certain tools to complete the partition of simulation tasks, such as METIS, Chaco;These traditional tools usually perform very good when the simulation environment is of the same structure. However, in the complex physical computing environment, such as a large number of computing nodes whose calculation ability is different, a wide gap on the communication capabilities and so on, the traditional topology partition tools is difficult to achieve efficiency optimal, resulting in computing power a tremendous waste. Therefore, we introduce a Cluster Instructed Partitioning Algorithm (CIPA), suitable for partitioning simulation tasks for heterogeneous platform. In complex network environment, this method organizes the computing nodes by clustering, and distributes the simulated topology to the computing nodes properly combined with the improved topology graph partition. It can get a balanced partitioning result, and greatly improve the efficiency of the entire system.

关键词： parallel network simulation Topology graph partition Partitioning algorithm Cluster analysis

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Know thy simulation model: analyzing event interactions for probabilistic synchronization in parallel simulations 12

Know thy simulation model: analyzing event interactions for ...

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Proceedings of the 5th International ICST Conference on simulation Tools and Techniques

作者： Georg Kunz Mirko Stoffers James Gross Klaus Wehrle RWTH Aachen University

ISBN: (纸本)9781450315104

Efficiently scheduling and synchronizing parallel event execution constitutes the fundamental challenge in parallel discrete event simulation. Existing synchronization algorithms typically do not analyze event interactions within the simulation model -- mainly to minimize runtime overhead and complexity. However, we argue that disregarding event interactions results in a lack of insight into the behavior of the simulation model, thereby severely limiting synchronization efficiency and thus parallel performance. In this paper, we present a probabilistic synchronization scheme that obtains extensive knowledge of the simulation behavior at runtime to guide event execution. Specifically, we design three heuristics that dynamically derive event dependencies from tracing event interactions and decide whether or not to speculatively execute events. Our evaluation shows that the proposed probabilistic synchronization scheme considerably outperforms traditional conservative and optimistic schemes.

关键词： probabilistic synchronization parallel network simulation

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Runtime efficient event scheduling in multi-threaded network simulation 11

Runtime efficient event scheduling in multi-threaded network...

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Proceedings of the 4th International ICST Conference on simulation Tools and Techniques

作者： Georg Kunz Mirko Stoffers James Gross Klaus Wehrle Communication and Distributed Systems and RWTH Aachen University RWTH Aachen University

ISBN: (纸本)9781936968008

Developing an efficient parallel simulation framework for multiprocessor systems is hard. A primary concern is the considerable amount of parallelization overhead imposed on the event handling routines of the simulator. Besides complex event scheduling algorithms, the main sources of overhead are thread synchronization and locking of shared data. Thus, compared to sequential simulation, the overhead of parallelization may easily outweigh its performance *** introduce two efficient event handling schemes based on our parallel-simulation extension Horizon for OMNeT++. First, we present a push-based event handling scheme to minimize the overhead of thread synchronization and locking. Second, we complement this scheme with a novel event scheduling algorithm that significantly reduces the overhead of parallel event scheduling. Lastly, we prove the correctness of the scheduling algorithm. Our evaluation reveals a total reduction of the event handling overhead of up to 16x.

关键词： multi-threading parallel network simulation performance optimization

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A Mechanism of Predicting network simulation Performance Based on BP Nets

A Mechanism of Predicting Network Simulation Performance Bas...

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IITA International Conference on Control, Automation and Systems Engineering

作者： Yu, Jiahua Yu, Xiangzhan Wu, Gang Liu, LiPing Harbin Inst Technol Sch Comp Sci & Technol Harbin 150006 Peoples R China

ISBN: (纸本)9780769537283

Performance analysis is a key issue in parallel network simulation. This paper proposes a new mechanism of parallel network simulation performance prediction. Analyzing the key factors of impacting parallel simulation performance, six parameters which may determine the time-cost of network simulation is presented. Then we adopt the Back Propagation (BP) network to approximate to the non-linear relation between time-cost and these parameters. So we can carry out a very good prediction to the new network simulation missions with BP nets. This mechanism also does not require configuring all the workstation with same kind of hardware/software environment.

关键词： parallel network simulation Performance Prediction BP Nets

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Experiences applying parallel and interoperable network simulation techniques in on-line simulations of military networks 02

Experiences applying parallel and interoperable network simu...

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Proceedings of the sixteenth workshop on parallel and distributed simulation

作者： Kalyan Perumalla Richard Fujimoto Thom McLean George Riley Georgia Institute of Technology Atlanta GA

ISBN: (纸本)9780769516080

We present a case study in which we apply parallel simulation methods and interoperability techniques to network simulations for simulation-based on-line control of military communication networks. The on-line simulations model actual military networks, including wired shipboard sub-networks connected via satellite links, and wireless mobile devices. The modeled scenario depicts the communication requirements of an amphibious landing where a complex network connects troops ashore and naval vessels. The simulations use a heterogeneous set of tools, including ns2 models for shipboard wired networks, and GloMoSim models for the wireless devices. In this paper, we document the challenges we encountered in applying parallel and interoperable simulation methods, and describe our solutions. We describe our experiences in addressing the interoperability problems that naturally arose due to the heterogeneity of scenario models. We also present a preliminary study on the scalability of real-time performance of parallel network simulations, which is crucial for on-line simulations. Salient system characteristics of the subject military network scenarios are described for the benefit of exposure to the modeling and simulation research community. Our exercise not only highlights the relevance of parallel and distributed simulation techniques to an important real-life problem, but also demonstrates the feasibility of applying those techniques in a practical setting.

关键词： Interoperability parallel network simulation On-line simulation

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