7.5 Summary

ns-3 includes an extremely rich environment allowing users at several levels to customize the kinds of information that can be extracted from simulations.

There are high-level helper functions that allow users to simply control the collection of pre-defined outputs to a fine granularity. There are mid-level helper functions to allow more sophisticated users to customize how information is extracted and saved; and there are low-level core functions to allow expert users to alter the system to present new and previously unexported information in a way that will be immediately accessible to users at higher levels.

This is a very comprehensive system, and we realize that it is a lot to digest, especially for new users or those not intimately familiar with C++ and its idioms. We do consider the tracing system a very important part of ns-3 and so recommend becoming as familiar as possible with it. It is probably the case that understanding the rest of the ns-3 system will be quite simple once you have mastered the tracing system

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