This paper provides an overview of the SPEEDESpersistence framework that is currently used to automatecheckpoint/restart for the Joint simulation System. Thepersistence framework interfaces are documented in thispaper...
ISBN:
(纸本)9780769519708
This paper provides an overview of the SPEEDESpersistence framework that is currently used to automatecheckpoint/restart for the Joint simulation System. Thepersistence framework interfaces are documented in thispaper and are proposed standards for the Standardsimulation *** persistence framework fundamentally keeps trackof memory allocations and pointer references within ahigh-speed internal database linked with *** persistence, an object, and the collection of objectsit recursively references through pointers, can beautomatically packed into a buffer that is written to diskor sent as a message to another machine. Later, thatbuffer can be used to reconstruct the object and all of itsrecursively referenced objects. The reconstructed objectswill likely be instantiated at different memory *** persistence framework automatically updates allaffected pointer references to account for this *** persistence framework is fully integrated with theSPEEDES rollback infrastructure and built-in containerclass libraries that include an implementation of theStandard Template Library. These utilities automatesupport for optimistic event processing required by manyhigh-performance parallel and distributed timemanagement algorithms. In the future, persistence willenable dynamic load balancing algorithms to migratecomplex objects to different processors.
This paper presents Maya, a multi-paradigm, scalableand extensible network modeling framework for emulatingdistributed applications. A novel three-tier architecture isproposed to integrate three disparate modeling par...
ISBN:
(纸本)9780769519708
This paper presents Maya, a multi-paradigm, scalableand extensible network modeling framework for emulatingdistributed applications. A novel three-tier architecture isproposed to integrate three disparate modeling paradigms,namely, discrete event models, analytical models and physicalnetwork interfaces into one unified framework of *** the first effort to integrate all three paradigms intoone framework, this paper discusses the implementationsof Maya using Qualnet, fluid flow based TCP model andphysical network interface. It addresses the performanceissues involved in attaining the real time constraints imposedby distributed applications and demonstrates the effectivenessof 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%.
The proceedings contain 19 papers. The topics discussed include: conservative simulation using distributed-shared memory;the lookahead in a user-transparent conservative parallel simulator;addressing blocking and scal...
ISBN:
(纸本)0769516084
The proceedings contain 19 papers. The topics discussed include: conservative simulation using distributed-shared memory;the lookahead in a user-transparent conservative parallel simulator;addressing blocking and scalability in critical channel traversing;early cancellation: an active NIC optimization for time-warp;critical causality in distributed virtual environments;a scalable architecture for supporting interactive games on the Internet;evaluation of a sort-based matching algorithm for DDM;lookahead revisited in wireless network simulations;genesis: a system for large-scale parallel network simulation;experiences applying parallel and interoperable network simulation techniques in on-line simulations of military networks;updateable simulation of communication networks;and stone axes and warhammers: a decade of distributedsimulation in aviation research.
The following topics are dealt with: conservative simulation using distributed shared memory; parallelsimulation; optimistic simulation; virtual environments and HLA; network simulation; distributedsimulation; and d...
The following topics are dealt with: conservative simulation using distributed shared memory; parallelsimulation; optimistic simulation; virtual environments and HLA; network simulation; distributedsimulation; and discrete event simulation.
A real-time fault-tolerant multicast protocol is necessary for obtaining high performance in operating distributed real-time computing systems. The purpose of this paper is to show the efficiency of RFRM (Release-time...
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ISBN:
(纸本)0769515762
A real-time fault-tolerant multicast protocol is necessary for obtaining high performance in operating distributed real-time computing systems. The purpose of this paper is to show the efficiency of RFRM (Release-time based Fault-tolerant Real-time Multicast) protocol which is based on the idea of attaching the official release time to each multicast message. As a part of this, a real-time simulation based on the TMO structuring scheme is conducted to evaluate the proposed approach. We experiment a real-time multicast model which does not receive ack-messages toward reducing the message traffic on the network by employing fault detection mechanism. simulation results promised the efficiency of the proposed real-time multicast protocol.
In real-time simulation, the system being simulated should display the same timing behavior as the target system. The simulation accuracy is increased as the simulation time unit is decreased. Although there are sever...
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ISBN:
(纸本)0769515762
In real-time simulation, the system being simulated should display the same timing behavior as the target system. The simulation accuracy is increased as the simulation time unit is decreased. Although there are several models for such a system, the TMO model is particularly appropriate due to its natural support for real-time distributed object oriented programming. This paper discusses the results of the implementation of a real-time airplane-landing simulator on a distributed computing environment using the TMO model.
One of the difficulties inherent to conservative parallel discrete event simulation (PDES) is the need for extraction and explicit specification of the lookahead. In this paper we propose a simulator design which allo...
ISBN:
(纸本)0769516084
One of the difficulties inherent to conservative parallel discrete event simulation (PDES) is the need for extraction and explicit specification of the lookahead. In this paper we propose a simulator design which allows users to build simulation models with lookahead transparently, This is based on the cooperation between PDES experts and the users, and on the reusability, of model components. We introduce the principal design of the simulator and give the results related to its lookahead.
Running a large-scale distributedsimulation may need a large amount of computing resources at geographically different locations. These resources may be from different organizations. The simulation may run for a long...
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ISBN:
(纸本)0769518532
Running a large-scale distributedsimulation may need a large amount of computing resources at geographically different locations. These resources may be from different organizations. The simulation may run for a long period of time and the availability and the amount of computing resources available may change during the course of the simulation execution. Therefore, coordinating and managing the resources for distributedsimulation to complete the simulation efficiently and effectively is a, critical issue. This paper describes a load management system for HLA-based distributedsimulation. The system is constructed on top of a Grid Computing environment supported by Globus. The overall structure of the system is presented in the paper and how the system saves and restores a federate is also discussed in detail.
Ten years ago, MITRE/CAASD built a realtime, Human-In-The-Loop (HITL) research laboratory. The focus of this lab is integration and human factors research for the air traffic control and aviation communities. The last...
ISBN:
(纸本)0769516084
Ten years ago, MITRE/CAASD built a realtime, Human-In-The-Loop (HITL) research laboratory. The focus of this lab is integration and human factors research for the air traffic control and aviation communities. The last ten years have been illuminating in terms of the evolution of laboratory capabilities, infrastructure, and corporate culture. This paper will describe the laboratory environment, its history and vision, and will also provide some examples of how distributedsimulation technology has been applied, and continues to evolve, in a real-world HITL simulation environment serving a broad range of research needs.
This paper threats about a work that is inserted in the context of CRUX project, which aims the conception of a complete environment for parallel programming, in development in the Course of Pos-graduation in Computer...
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ISBN:
(纸本)0769518532
This paper threats about a work that is inserted in the context of CRUX project, which aims the conception of a complete environment for parallel programming, in development in the Course of Pos-graduation in Computer Science of Santa Catarina Federal University. This paper makes an evaluation of performance of several scheduling algorithms of real time found in the bibliography, about a simulation model that represents as the processing as the communication of this multi-computer. The objective was to quantify the effect of the scheduling algorithm and other factors about some metrics of selected performance, in order to verify the applicability of CRUX in real time systems.
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