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检索条件"任意字段=Proceedings of the seventh workshop on Parallel and distributed simulation"

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Software control systems for parallel simulation 16

Software control systems for parallel simulation

引用

16th workshop on parallel and distributed simulation

作者： Radhakrishnan, R Wilsey, PA Expt Comp Lab Cincinnati OH 45221 USA

ISBN: (纸本)0769516084

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 an), 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 Marp based parallel simulation.

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distributed simulation of timed coloured Petri nets 6

Distributed simulation of timed coloured Petri nets

引用

6th IEEE International workshop on distributed simulation and Real-Time Applications (DS-RT 2002)

作者： Furfaro, A Nigro, L Pupo, F Univ Calabria Dipartimento Elettr Informat & Sistemist Lab Ingn Software I-87036 Cosenza Italy

ISBN: (纸本)0769518532

This paper introduces a Coloured Petri Nets formalism -TCPN- which is suitable for modelling and simulation of complex systems. Novel in TCPN is (i) a timing model which accommodates both unordered and ordered (queue) places;(ii) the adoption of Java as the net inscription language. TCPN is supported by a graphical tool RAINBOW - which allows model design, testing and simulation. A large TCPN model can be split into regions (subnets) whose execution is assigned to different LP/processors of a networked simulator. distributed simulation relies on TUTW an agent-based Time Warp algorithm capable of exploiting temporal uncertainty for improving simulation performance. The paper describes TCPN and its distributed execution kernel. The practical use of TCPN is demonstrated through an example and some experimental results.

关键词： Analytical models Discrete event simulation Java Kernel Performance analysis Petri nets Testing Time warp simulation Timing Uncertainty

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

Experiment scheduling in faster-than-real-time simulation

引用

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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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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XSim:: Real-time analytic parallel simulations 16

<i>XSim</i>:: Real-time analytic parallel simulations

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16th workshop on parallel and distributed simulation

作者： Carothers, CD Rensselaer Polytech Inst Dept Comp Sci Troy NY 12180 USA

ISBN: (纸本)0769516084

Of critical importance to any real-time system is the issue of predictability. We divide overall system predictability into two parts: algorithmic and systemic. Algorithmic predictability is concerned with ensuring that the parallel simulation engine and model from a complexity point of view are able to consistently yield results within a real-time deadline. Systemic predictability is concerned with ensuring that OS scheduling, interrupts and virtual memory overheads are consistent over a real-time period. To provide a framework for investigating systemic predictability, we define a new class of parallel simulation called Extreme simulation or XSim. An XSim is any analytic parallel simulation that is able to generate a statistically valid result by a real-time deadline. Typically, this deadline is between 10 and 100 milliseconds. XSims are expected to provide decision support to existing complex, realtime systems. As a new design and implementation methodology for realizing XSims, we embed a state-of-the-art optimistic simulator into the Linux operating system. In this operating environment, OS scheduling and interrupts are disabled. Given a 50 millisecond model completion deadline, we observe that the XSim has a systemic predictability, measure of 98% compared with only 56% for the same Time Warp system operating in user-level.

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Early cancellation: An active NIC optimization for Time-Warp 16

Early cancellation: An active NIC optimization for Time-Warp

引用

16th workshop on parallel and distributed simulation

作者： Noronha, R Abu-Ghazaleh, NB SUNY Binghamton Dept Comp Sci Binghamton NY 13902 USA

ISBN: (纸本)0769516084

parallel Discrete Event simulation (PDES) on a cluster of workstations is a fine grained application where the communication performance can dictate the effiency of the simulation. The high performance Local/System Area Networks used in high-end clusters are capable of delivering data with high bandwidth and low latency. Unfortunately, the communication rate far out-paces the capabilities of workstation nodes to handle it (I/O bus, memory bus, CPU resources). For this reason, many vendors are offering a programmable processor on the NIC to allow application specific optimization of the communication path. This invites a new implementation model for distributed applications where: (i) application specific communication optimizations can be implemented on the NIC;(ii) portions of the application that are most heavily communicating can be migrated to the NIC;(iii) some messages can be filtered out at the NIC without burdening the primary processor resources;and (iv) critical events are detected and handled early. The aim of our research is to investigate the utility of this model for PDES and to gain initial experiences in the implementation challenges and potential performance improvement. In this paper, we present our experiences with Early Cancellation - an optimization for Time- Varp that cancels messages in place upon early discovery of a rollback. We believe that there is a large scope for additional optimizations using this model.

关键词： clusters global virtual time programmable NIC Time Warp event simulation

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parallel implementation of composite events 22

Parallel implementation of composite events

引用

22nd International Conference on distributed Computing Systems

作者： Shmueli, M Etzion, O Technion Israel Inst Technol IL-32000 Haifa Israel

ISBN: (纸本)0769515886

Composite events are required for many applications that require obtaining events from various sources, correlating them, and activating appropriate actions. One of the major issues in composite event system is scalability. This paper reports on a research that follows the situation concept of the Amit system, and proposes a parallel execution model for the event composition. The paper describes the model and its difficulties, and shows its usefulness using simulation results.

关键词： active technology parallel processing scalability

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An implementation of a distributed algorithm for detection of local knots and cycles in directed graphs based on the CSP model and Java 6

An implementation of a distributed algorithm for detection o...

引用

6th IEEE International workshop on distributed simulation and Real-Time Applications (DS-RT 2002)

作者： de Souza, GP Pfitscher, GH Univ Brasilia Dept Comp Sci BR-70910900 Brasilia DF Brazil

ISBN: (纸本)0769518532

Cycles and knots in directed graphs are problems that can be associated with deadlocks in database and communication systems. Many algorithms to detect cycles and knots in directed graphs were proposed. Boukerche and Tropper have proposed a distributed algorithm that solve the problem in a efficient away. Their algorithm has a message complexity of 2m vs. (at least) 4m for the Chandy and Misra algorithm, where in is the number of links in the graph, and requires 0 (n log n) bits of memory, where n is the number of nodes. We have implemented Boukerche and Tropper's algorithm according to the construction of processes of the CSP model. Our implementation was done. using JCSP, an implementation of CSP for Java, and the results are presented.

关键词： Algorithm design and analysis Communication systems Computer aided software engineering Database systems distributed algorithms Fault tolerant systems Frequency IP networks Java System recovery

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The design of the distributed ABELS brokering system

The design of the distributed ABELS brokering system

引用

6th IEEE International workshop on distributed simulation and Real-Time Applications (DS-RT 2002)

作者： Wilson, LF Xie, B Kimpel, JM Mills-Tettey, GA Johnston, G Dartmouth Coll Thayer Sch Engn Hanover NH 03755 USA

ISBN: (纸本)0769518532

Many simulations and other applications need to interact seamlessly with distributed data resources. The Agent-Based Environment for Linking simulations (ABELS) allows the formation of a dynamic "data and simulation cloud" that links a heterogeneous collection of networked resources. ABELS consists of three major types of components: user entities that serve as data producers and/or consumers, a brokering system for organizing and linking the various participants, and generic local agents that connect simulations and data resources to the cloud of participants. This paper presents the design of the distributed brokering system, which is implemented using Java and Sun Microsystems' Jini technology.

关键词： Java programming language

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Automatic construction of hierarchical federations architecture 6

Automatic construction of hierarchical federations architect...

引用

6th IEEE International workshop on distributed simulation and Real-Time Applications (DS-RT 2002)

作者： Cai, WT Li, GG Turner, SJ Lee, BS Liu, L Nanyang Technol Univ Sch Comp Engn Singapore 639798 Singapore

ISBN: (纸本)0769518532

The High Level Architecture allows simulation components Of various hypes to be joined together into a federation to create a common virtual environment. However with the increased complexity of simulations, not all user requirements can be satisfied by a flat federation. The requirement of selective information hiding naturally suggests a Hierarchical Federations Architecture (HFA) where federations are organized into hierarchies so that a federation appears as a federate in an upper level federation. In order to provide reusability and interoperability at the federation level, a federation should be able to participate in different super-federations without requiring code modification. In this paper we present an approach to automatically construct the HFA. We describe the information that must be provided by the participating user federations and how this is used to construct the Universal Object Model (UOM) used by the super-FOMs (the FOMs of super-federations). We show how the structure for selective information hiding is generated from the user information and how gateway federates are automatically constructed to support super-FOM independence.

关键词： distributed simulations HLA federation community hierarchical federations HLA bridge (Proxy federate or gateway federate) reusability interoperability and selective information hiding

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