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Software control systems for parallel simulation 02

Software control systems for parallel simulation

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proceedings of the sixteenth workshop on parallel and distributed simulation

作者： Radharamanan Radhakrishnan Philip A. Wilsey Experimental Computing Laboratory Cincinnati OH

ISBN: (纸本)9780769516080

parallel simulations using optimistic synchronization strategies such as Time Warp, operate with no regard to global synchronization since this results in greater parallelism and lower synchronization cost. However, like virtual memory, the parallel simulators may end up thrashing instead of performing useful work. The complication in using a Time Warp simulator is then to configure it suitably for good performance and avoid thrashing. Unfortunately, the optimal configuration is not generally static among different applications or even throughout an entire run of a single application. Thus, online feedback control systems are deployed to govern the adjustment of input parameters in our Time Warp simulation kernel. The design and implementation of effective feedback control systems can be difficult; the extra processing is pure overhead that must be absorbed by any performance gains delivered. The problem is further complicated when attempting to build a simulation kernel that is designed efficiently to operate with many different applications. In this paper, we introduce a control-centric architecture that is used to monitor and manage different parts of a Time Warp simulator. Specifically, we extend concepts from control theory such as adaptive control and stability, to better understand and design hierarchically-distributed run-time control systems for Time Warp based parallel simulation.

关键词： parallel Discrete-Event simulation Time Warp distributed simulation Run-time Control Control Theory

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Efficient distributed simulation of a communication switch with bursty sources and losses 00

Efficient distributed simulation of a communication switch w...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： A. S. McGough I. Mitrani Computing Science Department University of Newcastle Newcastle upon Tyne NE1 7RU

ISBN: (纸本)9780769506678

Algorithms for simulating an ATM switch on a distributed memory multiprocessor are described. These include parallel generation of bursty arrival streams, along with the marking and deleting of lost cells due to buffer overflows. These algorithms increase the amount of computation carried out independently by each processor, and reduce the communication between the processors. When the number of cells lost is relatively small, the run time of the simulation is approximately O(N/P), where N is the total number of cells simulated and P is the number of processors. The cells are processed in intervals of fixed length; that length affects the structure and the performance of the algorithms.

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Large-scale TCP models using optimistic parallel simulation 03

Large-scale TCP models using optimistic parallel simulation

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workshop on Principles of Advanced and distributed simulation (PADS)

作者： G. Yaun C.D. Carothers Shivkumar Kalyanaraman Department of Computer Science Rensselaer Polytechnic Institute Troy NY USA Department of Electrical and Computer Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

ISBN: (纸本)9780769519708

Internet data traffic is doubling each year, yet bandwidth does not appear to be growing as fast as expected and thus short falls in available bandwidth, particularly at the "last mile" may result. To address these bandwidth allocation and congestion problems, researchers are proposing new overlay networks that provide a high quality of service and a near lossless guarantee. However, the central question raised by these new services is what impact will they have in the large? To address these and other network engineering research questions, high performance simulation tools are required. However, to date, optimistic techniques have been viewed as operating outside of the performance envelope for Internet protocols, such as TCP, OSPF and BGP. We dispel those views and demonstrate that optimistic protocols are able to efficiently simulate large scale TCP scenarios for realistic, network topologies using a single Hyper-Threaded computing system costing less than $7000 USD. For our real world topology, we use the core AT&T US network. Our optimistic simulator yields extremely high efficiency and many of our performance runs produce zero rollbacks. Our compact modelling framework reduces the amount of memory required per TCP connection and thus our memory overhead per connection for one of our largest experimental network topologies was 2.6 KB. That value was comprised of all events used to model TCP packets, TCP connection state and routing information.

关键词： Large-scale systems Network topology Internet Bandwidth Protocols Computational modeling Telecommunication traffic Traffic control Channel allocation Quality of service

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Cluster computing vs. Cray T3E-a case study from numerical field theory

Cluster computing vs. Cray T3E-a case study from numerical f...

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Euromicro workshop on parallel and distributed Processing

作者： G. Arnold N. Eicker T. Lippert K. Schilling Department of Physics University of Wuppertal Wuppertal Germany

ISBN: (纸本)0769509878

We compare the performance of a simulation code for lattice quantum electrodynamics, running on the cluster computer ALiCE (Alpha-Linux-Cluster-Engine) and the Cray T3E-1200 system. We present results from simulations using the novel parallelized multicanonical hybrid Monte Carlo algorithm. We merge multicanonical simulation techniques with the hybrid Monte Carlo algorithm to achieve a parallel scheme, and thus to be able to fight the notorious metastabilities by use of high performance parallel computers. We demonstrate for this application field that ALiCE is superior to the Cray T3E-1200 by factors of about 1.3 to 2.

关键词： Computational modeling Computer simulation Quantum computing Monte Carlo methods Clustering algorithms Lattices Electrodynamics Metastasis Concurrent computing High performance computing

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Integrating library modules into special purpose parallel algorithms

Integrating library modules into special purpose parallel al...

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IEEE International workshop on Software Engineering for parallel and distributed Systems

作者： T. Rauber G. Runger Institut für Informatik Universität Halle Wittenberg Halle Germany Fachbereich Informatik Universität des Saarlandes Saarbruecken Germany

Most programs from scientific computing can benefit from the use of numerical libraries which provide efficient implementations for standard solution methods that often occur in numerical simulations. This is especially true for parallel scientific computing. A methodology that allows the integration of library functions without any additional programming effort would ease this programming style. The authors address the question how to integrate library procedures into hierarchically organized parallel programs. The hierarchical structure of a specific algorithms results from a top-down decomposition into submethods which can be realized by library functions. The integration of library functions not only requires a correct specification of data dependencies between different modules but has also to take into account a possible distribution of data among the processors. They present algorithms for the adaptation of library modules such that their functional type and underlying data distribution fit into the hierarchical framework. The adaptation includes the construction of dataflow graphs that can be used to determine data distributions for the library modules such that a minimal global execution time results.

关键词： Libraries parallel algorithms Scientific computing Functional programming Data analysis Numerical simulation Numerical models Algorithm design and analysis Computational modeling Nonlinear equations

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On extending parallelism to serial simulators 95

On extending parallelism to serial simulators

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proceedings of the ninth workshop on parallel and distributed simulation

作者： David Nicol Philip Heidelberger Department of Computer Science The College of William and Mary Williamsburg VA IBM T.J. Watson Research Center P.O. Box 704 Yorktown Heights NY

ISBN: (纸本)9780818671203

This paper describes an approach to discrete event simulation modeling that appears to be effective for developing portable and efficient parallel execution of models of large distributed systems and communication networks. In this approach, the modeler develops sub-models using an existing sequential simulation modeling tool, using the full expressive power of the tool. A set of modeling language extensions permit automatically synchronized communication between sub-models; however, the automation requires that any such communication must take a non-zero amount of simulation time. Within this modeling paradigm, a variety of conservative synchronization protocols can transparently support conservative execution of sub-models on potentially different processors. A specific implementation of this approach, U.P.S. (Utilitarian parallel Simulator), is described, along with performance results on the Intel Paragon.

关键词： utilitarian parallel simulator protocols discrete event simulation modeling performance discrete event simulation modeling language extensions large distributed systems synchronization protocols synchronisation communication networks Intel Paragon serial simulators

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Techniques for wrapping scientific applications to CORBA components

Techniques for wrapping scientific applications to CORBA com...

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International workshop on High-Level parallel Programming Models and Supportive Environments

作者： T. Forkert G.K. Kloss C. Krause A. Schreiber Deutsches Zentrum für Luft-und Raumfahrt e. V. Simulation and Software Technology Cologne Germany

This paper presents wrapping techniques that we have developed in order to integrate applications into the scientific workflow management system TENT. These techniques take into account the varying degrees of controllability found for each application and utilize various kinds of communication mechanisms between application and the associated wrapper. We also give an outline of the principles of component technology employed in the CORBA based TENT environment. In addition, the means by which applications can be connected through their associated wrappers and TENT components to form distributed workflows are presented. It is demonstrated how TENT provides the user with a homogeneous perspective on scientific workflows running in a distributed environment and how he is enabled to efficiently configure and control these workflows by means of the TENT component model.

关键词： Wrapping Application software Computational modeling Graphical user interfaces Data visualization distributed computing Workflow management software Maintenance engineering Environmental management Software packages

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Model structure and load balancing in optimistic parallel discrete event simulation 00

Model structure and load balancing in optimistic parallel di...

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proceedings of the fourteenth workshop on parallel and distributed simulation

作者： Tapas K. Som Robert G. Sargent IBM and Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY Simulation Research Group Department of Electrical Engineering and Computer Science Syracuse University Syracuse NY

ISBN: (纸本)9780769506678

The concept of strong groups is introduced to describe the structure of simulation models. It is shown that logical processes within strong groups process at approximately the same rate and that different strong groups can progress at different rates. An algorithm based on the rates of the strong groups is presented to balance the load among the physical processors and for flow control.

关键词： flow control simulation model structure parallel simulation load balancing optimistic protocols

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Virtual cut-through implementation of the HB packet switching routing algorithm

Virtual cut-through implementation of the HB packet switchin...

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Euromicro workshop on parallel and distributed Processing

作者： P. Palazari M. Coli ENEA Rome Italy Electronic Engineering Department University of Roma La Sapienza Rome Italy

In the last years, since the early 80's, wormhole and virtual cut through routing modalities have replaced packet switching and circuit switching schemes. We give the theoretical bases to implement hole based (HB) routing algorithm (M. Coli and P. Palazzari, 1995) by using the virtual cut through modality. After reviewing the theory of HB routing, we demonstrate some theorems which allow us to use such a theory, developed for the packet switching case, also for the virtual cut through modality (HB-VCT routing algorithm). The main features of HB-VCT are its full adaptivity, the high fault tolerance capabilities and the low HW requirement. Furthermore, low latencies and high bandwidths are achievable because the use of virtual channels can be avoided. Some simulated results are presented in order to show the good traffic balance capabilities and the fault tolerant behavior of HB-VCT. simulation is also used to show the influence on throughput of traffic intensity and of a HB-VCT control parameter (the timeout).

关键词： Packet switching Routing System recovery Fault tolerance Delay Switching circuits Bandwidth Buffer storage Throughput parallel machines

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The dynamic load balancing of clustered time warp for logic simulation 96

The dynamic load balancing of clustered time warp for logic ...

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proceedings of the tenth workshop on parallel and distributed simulation

作者： Hervé Avril Carl Tropper School of Computer Science McGill University Montréal Canada H3A 2A7 and Hutchison Avenue Software Corporation Montréal Canada School of Computer Science McGill University Montréal Canada H3A 2A7

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