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Experiment scheduling in faster-than-real-time simulation 16

Experiment scheduling in faster-than-real-time simulation

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16th workshop on parallel and distributed simulation

作者： Anagnostopoulos, D Univ Athens Dept Informat Athens 15771 Greece

ISBN: (纸本)0769516084

Faster-than-real-time simulation (FRTS) can be used for the performance evaluation of systems behavior in real time, providing significant capabilities for studying systems with a time-varying behavior. FRTS enables model validation through comparing simulation results with the corresponding system observations. However, experimentation proves to be rather demanding, as both delivering output results and ensuring their reliability must be accomplished within a predetermined time frame. Output analysis of system observations and model results and relevant timing issues are discussed. A method is introduced that determines whether it is possible to execute the "optimal" faster-than-real-time experiment, in which case multiple replications are scheduled for execution, or a compromise has to be made between the ability to predict for the long future and the degree of reliability achieved for predictions. FRTS experimental results are also presented to support the effectiveness of the proposed method.

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State saving for interactive optimistic simulation

State saving for interactive optimistic simulation

引用

11th workshop on parallel and distributed simulation

作者： Franks, S Gomes, F Unger, B Cleary, J Univ of Waikato Hamilton New Zealand

ISBN: (纸本)0818679654

Time Warp's optimistic scheduling requires the maintenance of simulation state history to support rollback in the event of causality violations. State history, and the ability to rollback the simulation, can provide unique functionality for human-in-the-loop simulation environments. This paper investigates the use of Time Warp to output valid simulation state in a near real-time manner re-execute portions of the simulation, and interactively probe simulation values to ascertain underlying causes of transient behavior. A shared-memory, multi-threaded interactive simulation architecture is presented and the additional state saving requirements imposed by interactivity are examined. The shortcomings of existing state saving schemes lead us to propose Multiplexed State Saving (MSS). By interleaving checkpointing and incremental state logs MSS provides bounded rollback costs and asynchronous access to prior simulation state. The interaction algorithms and MSS form a scalable, bounded cost component suitable for use in a real-time interactive Time Warp system.

关键词： Interactive computer systems

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Quantum Algorithms and simulation for parallel and distributed Quantum Computing 2

Quantum Algorithms and Simulation for Parallel and Distribut...

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2nd International workshop on Quantum Computing Software (QCS)

作者： Parekh, Rhea Ricciardi, Andrea Darwish, Ahmed DiAdamo, Stephen Tech Univ Munich Munich Germany

ISBN: (纸本)9781728186740

A viable approach for building large-scale quantum computers is to interlink small-scale quantum computers with a quantum network to create a larger distributed quantum computer. When designing quantum algorithms for such a distributed quantum computer, one can make use of the added parallelization and distribution abilities inherent in the system. An added difficulty to then overcome for distributed quantum computing is that a complex control system to orchestrate the various components is required. In this work, we aim to address these issues. We explicitly define what it means for a quantum algorithm to be distributed and then present various quantum algorithms that fit the definition. We discuss potential benefits and propose a high-level scheme for controlling the system. With this, we present our software framework called Interlin-q, a simulation platform that aims to simplify designing and verifying parallel and distributed quantum algorithms. We demonstrate Interlin-q by implementing some of the discussed algorithms using Interlin-q and layout future steps for developing Interlin-q into a control system for distributed quantum computers.

关键词： distributed quantum computing distributed quantum algorithms quantum software networked control systems

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Improving conservative VHDL simulation performance by reduction of feedback

Improving conservative VHDL simulation performance by reduct...

引用

proceedings of the 1996 10th workshop on parallel and distributed simulation, PADS

作者： Hurford, Joel F. Hartrum, Thomas C. Air Force Inst of Technology

This paper describes two forms of feedback in the simulation runtime of VHDL circuits that greatly influences performance. While circuit feedback and strongly connected components have been observed and documented as detrimental influences to conservative parallel discrete event simulation (PDES) efficiency, that influence has never been quantified. Moreover, in this study, the phenomenon of induced feedback [1] was observed to diminish speedup to the same degree as explicit feedback. In this paper the influence of feedback on simulation runtime is analyzed and an O(n) algorithm for its elimination is presented. In addition, a metric for the quantification of feedback is introduced. By measuring feedback, it is possible to balance its influence on simulation runtime with that of other factors (e.g. load balance, number of processors, machine granularity, etc.) through the use of a cost-based partitioning approach. This paper reports significant improvements in runtime for three circuits due to the prevention of feedback using the partitioning algorithm presented. In addition, strong correlation between the feedback metric and conservative parallel simulation overhead is demonstrated.

关键词： Computer simulation

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Critical causality in istributed virtual environments 16

Critical causality in istributed virtual environments

引用

16th workshop on parallel and distributed simulation, PADS 2002

作者： Zhou, Suiping Cai, Wentong Turner, S.J. Lee, F.B.S. School of Computer Engineering Nanyang Technological University Singapore Singapore

ISBN: (纸本)0769516084

We investigate the causality issue in distributed virtual environments. Causality has been widely studied in parallel and distributed systems. However, most of the work in causality detection and preservation are from a logical time system point of view, which are not generally suitable for distributed virtual environments due to the high cost of the proposed schemes to preserve causality. In this paper, first, critical causal order is defined, which is a relaxation of the "happened before"-based causal relation. Then, causal receive order delivery is proposed with the advantage that both the real-time property of distributed virtual environments and the critical causal order relationship among events are preserved. Finally, an algorithm to achieve causal receive order delivery is given. Our algorithm is easy to implement, and it results in little extra traffic on the network. © 2002 IEEE.

关键词： causality distributed simulation virtual environments

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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...

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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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Analytic performance model for speculative, synchronous, discrete-event simulation

Analytic performance model for speculative, synchronous, dis...

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PADS 2000 - 14th ACM/IEEE/SCS workshop on parallel and distributed simulation

作者： Noble, Bradley L. Chamberlain, Roger D. Southern Illinois Univ Edwardsville Edwardsville United States

Performance models exist that reliably describe the execution time and efficiency of parallel discrete-event simulations executed in a synchronous iterative fashion. These performance models incorporate the effects of processor heterogeneity, other processor load due to shared computational resources, application workload imbalance, and the use of speculative computation. This includes modeling the effects of predictive optimism, a technique for improving the accuracy of speculative assumptions. We extend these models to incorporate correlated workloads across the set of processors and validate the models with two different applications.

关键词： Computer simulation

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Effect of synchronization requirements on the performance of distributed simulations

Effect of synchronization requirements on the performance of...

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proceedings of the 7th workshop on parallel and distributed simulation

作者： Shanker, Murali S. Patuwo, B.Eddy Kent State Univ Kent OH United States

ISBN: (纸本)1565550552

Recent experiments have shown that conservative methods can achieve good performance by exploiting the characteristics of the system being simulated. In this paper we focus on the interrelationship between run time and synchronization requirements of a distributed simulation. A metric that considers the effect of lookahead and the physical rate of transmission of messages, and an arrival approximation that models the effect of synchronization requirements on the run time are developed. It is shown that even when good lookahead is exploited in the system, poor run-time performance is achieved if an inefficient mapping of LPs to processors is used.

关键词： Computer simulation

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Teaching parallel and distributed Computing Concepts in simulation with WRENCH

Teaching Parallel and Distributed Computing Concepts in Simu...

引用

workshop on Education for High Performance Computing (EduHPC)

作者： Tanaka, Ryan da Silva, Rafael Ferreira Casanova, Henri Univ Hawaii Informat & Comp Sci Honolulu HI 96822 USA Univ Southern Calif Informat Sci Inst Marina Del Rey CA USA

ISBN: (纸本)9781728159751

Teaching topics related to high performance computing and parallel and distributed computing in a hands-on manner is challenging, especially at introductory, undergraduate levels. There is a participation challenge due to the need to secure access to a platform on which students can learn via hands-on activities, which is not always possible. There are also pedagogic challenges. For instance, any particular platform provided to students imposes constraints on which learning objectives can be achieved. These challenges become steeper as the topics being taught target more heterogeneous, more distributed, and/or larger platforms, as needed to prepare students for using and developing Cyberinfrastructure. To address the above challenges, we have developed a set of pedagogic activities that can be integrated piecemeal in university courses, starting at freshman levels. These activities use simulation so that students can experience hands-on any relevant application and platform scenarios. This is achieved by capitalizing on the capabilities of the WRENCH and SimGrid simulation frameworks. After describing our approach and the pedagogic activities currently available, we present results from an evaluation performed in an undergraduate university course.

关键词： Computer Science Education High Performance Computing parallel and distributed Computing Cyberinfrastructure simulation

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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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