Simulation is often based on random events.
Therefore, if you want a real time implementation, then if 2 events are
seperated by minutes, then you would just have to wait. Ns-2 is
event-oriented, and therefore if there is nothing to do between 2
events, then the clock is incremented, and you do not have to wait.
In the other hand, suppose you have a large simulation with a lot of
users. In case a complex treatment has to be done at each user's
equipment, then the computer would have to do it all, with NO real-time
guarantee !
Thirdly, ns-2 is a supported by a whole community, and freely available;
if you can find a real-time simulator please let me know, but I do not
see any.
-source-
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