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51 Implementation method and can therefore be run as an application. It allows the simulation of a single model partition using the SimulationEngine class. The exact simulation processing can be followed using the log4j logger parallelJavaGpssSimulator.gpss (details of the logging can be found in 5.3.5). In debug mode this logger outputs detailed steps of the simulation. Several test models where used to test the correct implementation of the basic scheduling and the GPSS blocks and other entities. They will not be described in more detail here because the same functionality will be tested again in the final version of the simulator (see validation phase in section 6). 5.2.3 Time Warp Parallel Simulation Engine During the third development phase the parallel simulator was implemented based on the Time Warp synchronisation algorithm. The functionality of the parallel simulator is split into the Simulation Controller side and the Logical Process side, each found in a different package. Figure 14 shows the general architecture and the main classes involved at each side during this development phase. Classes marked with (AO) are instantiated as ProActive Active Objects. Instances of the LogicalProcess class also communicate with each other, for instance in order to exchange Transactions, which is not displayed in Figure 14. Simulate SimulationController (AO) Configuration ModelFileParser LogicalProcess (AO) LogicalProcess (AO) ParallelSimulationEngine ParallelSimulationEngine Partition Partition Figure 14: Parallel simulator main class overview (excluding LPCC)
Simulation Controller side 52 Implementation At the Simulation Controller side is the root package parallelJavaGpssSimulator. It contains the class Simulate, which is the application class that is used to start the parallel simulator. When run the Simulate class will load the configuration from command line arguments or the configuration file, it will also load and parse the simulation model file and then create an Active Object instance of the SimulationController class (the JavaDoc documentation for this class can be found in Appendix E). The SimulationController instance receives the configuration settings and the simulation model when its simulate() method is called. As a result of this call the SimulationController class will read the deployment descriptor file and create the required number of LogicalProcess instances at the specified nodes. Logical Process side The functionality of the Logical Processes is found in the package parallelJavaGpssSimulator.lp. This package contains the LogicalProcess class, the ParallelSimulationEngine class (the JavaDoc documentation for both can be found in Appendix E) and a few helper classes. The LogicalProcess instances are created as Active Objects by the Simulation Controller. After their creation the LogicalProcess instances receive the simulation model partitions and the configuration when their initialize() method is called. When all LogicalProcess instances are initialised then the Simulation Controller calls their startSimulation() method to start the simulation. Figure 15 illustrates the communication flow between the Simulation Controller and the Logical Processes before and at the end of the simulation. The method calls just described can be found at the start of this communication flow. When the Simulation Controller detects that a confirmed simulation end has been reached then all Logical Processes are requested to end the simulation with a consistent state matching that confirmed simulation end using the endOfSimulationByTransaction() method. The Logical Processes will confirm when they reached the consistent simulation state after which the Simulation Controller will request the post simulation report details from each Logical Process. Further specific details about the implementation of the parallel simulator can be found in section 5.3.
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TRANSACTION-ORIENTED SIMULATION IN
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Table of Content II Table of Conten
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IV Table of Content 6 VALIDATION OF
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Figures VI Figures Figure 1: Ad Hoc
Page 9 and 10: Tables VIII Tables Table 1: Change
Page 11 and 12: 2 Introduction synchronisation algo
Page 13 and 14: 2 Fundamental Concepts Fundamental
Page 15 and 16: Figure 1: Ad Hoc Grid architecture
Page 17 and 18: 8 Fundamental Concepts In continuou
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Appendix A: Detailed GPSS Syntax 10
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Reserved word: DEPART Syntax: [] DE
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Reserved word: SEIZE Syntax: [] SEI
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Setting: LpccClusterNumber Default
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Appendix C: Simulator log4j loggers
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Logger: parallelJavaGpssSimulator.l
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114 Appendix D: Structure of the at
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Appendix E: Documentation of select
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!/+/.7/8$ Appendix E: Documentation
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Returns: Appendix E: Documentation
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!"#$%&'()#%*+,"-*.# Appendix E: Doc
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Constructor Detail !"#$%&'$(#$)*$%+
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Validation 1.1, output of simulate:
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Validation 2, output of LP: Appendi
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Appendix F: Validation output logs
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Validation 2, output of simulate: A
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Validation 3.1, output of LP1: Appe
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Validation 4, output of LP1: Append
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simulation for time 2000) (628) 20:
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Validation 4, output of simulate: A
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(135) 19:37:56,477 Total transactio
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(68) 19:37:56,619 by the transactio
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(1295) 14:25:22,740 Simulation stop
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Validation 6.2, output of LP2: (1)
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(32) (1,2) 0 765 Block: TRANSFER 0.
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