Contributions to Simulation Speed-Up: Rare Event Simulation by Eugen Lamers

By Eugen Lamers

Eugen Lamers explains the primary of simulation speed-up typically and soon demonstrates the approach Restart for the simulation of infrequent occasions. He introduces the temporary Dynamic Simulation inspiration, built for the making plans of cellular radio networks.

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Extra info for Contributions to Simulation Speed-Up: Rare Event Simulation and Short-Term Dynamic Simulation for Mobile Network Planning (Advanced Studies Mobile Research Center Bremen)

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The number of events necessary for the service of a single packet is increased from a single event for the end of the service time in non-PS simulations to g in PS simulations, one event for each partial removal of a packet in service. To prevent PS from influencing the behaviour of the other nodes in the network model, e. , the packet inter-arrival times at the other nodes, the departure event takes place at the same time as it would do in non-PS simulations. This means, the succeeding nodes are not informed about the partial end of the service of the packet before the service time has completely elapsed.

It appears natural to consider the possibilities to combine these approaches and to find out which way of parallelisation provides optimum additional speed-up for RESTART simulations. It is essential to note that the parallelisation approach is not applied to a straightforward simulation method but on the RESTART simulation speed-up method. 1. In the following it is shown which aspects have been considered for the development of distributed RESTART. The simulation toolkit MuSICS mentioned in chapter 3 has been extended with the implementation to produce the simulation results presented in this chapter.

Three different systematics classify the parallelisation of simulations. They are introduced briefly in the following. 1 Functional division The functional division considers the different functions from the simulators’ view. A simulator needs to generate (pseudo-)random number sequences, to evaluate and possibly to post-process the obtained results and to visualise them. From each of these elements more than one can exist. But there is only one control program which represents the actual simulation while all other processes represent auxiliary functions.

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