Contributions to Simulation Speed-Up by Eugen Lamers

By Eugen Lamers

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In the global-step all steps are simulated concurrently. The order of collecting a state and starting retrials is changed and reflects a recursive procedure. Both approaches can have multiple steps and are implemented in MuSICS. 4 System state A system state can have many parameters depending on the simulated model. In a simple single server queue, the system state consists of the number of packets or jobs in the queue, the remaining service time of the currently served packet, and the remaining time until the next packet is generated.

Here, a Poisson process is assumed if there is no further knowledge about the process. 12) follows. 12) has not been applied, or that the conditional probabilities PIi+1 |Ii have been estimated badly. If all this is not the case and the simulation is well configured, the linear selection should be preferred because of the prevention of additional computation overhead. 4 Combination of single-step and global-step A combination of the single-step method with the global-step method can use the advantages of both methods.

3, the RESTART-specific actions have to be initiated and controlled. The control of the RESTART/LRE procedure is bound to the evaluation of a single random variable. The process of the network component which provides the values for the random variable has to perform the evaluation. It has to initiate the store and restore operations on all involved simulation objects on all processes. The main aspect which disqualifies this approach for MuSICS is the very frequent transfer of job related data between the processes representing the network nodes.

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