A Simulation Execution Manager for ns-3

# A Simulation Execution Manager for ns-3

This is a Python library to perform multiple ns-3 script executions, manage the results and collect them in processing-friendly data structures.

# How does this work?

For complete step-by-step usage and installation instructions, check out our documentation.

# How to cite us

Davide Magrin, Dizhi Zhou, and Michele Zorzi. 2019. A Simulation Execution Manager for ns-3: Encouraging reproducibility and simplifying statistical analysis of ns-3 simulations. In Proceedings of the 22nd International ACM Conference on Modeling, Analysis and Simulation of Wireless and Mobile Systems (MSWIM '19). ACM, New York, NY, USA, 121-125. DOI: https://doi.org/10.1145/3345768.3355942

# Contributing

This section contains information on how to contribute to the project. If you are only interested in using SEM, check out the documentation.

If you want to contribute to sem development, first of all you'll need an installation that allows you to modify the code, immediately see the results and run tests.

## Building the module from scratch

This module is developed using poetry: in order to correctly manage virtual environments and install dependencies, make sure it is installed. Typically, the following is enough:

curl -sSL https://install.python-poetry.org | python3 -


Note that, if poetry's installer does not add poetry's path to your shell's startup file properly, you may need to add source \$HOME/.poetry/env to your startup file. You can tell that you need to add it if your shell cannot find the poetry command the next time you open a terminal window.

Then, clone the repo (or your fork, by changing the url in the following command), also getting the ns-3 installations that are used for running examples and tests:

git clone https://github.com/signetlabdei/sem
cd sem
git submodule update --init --recursive


From the project root, you can then install the package and the requirements with the following:

poetry install


This will also get you a set of tools such as sphinx, pygments and pytest that handle documentation and tests.

Finally, you can spawn a sub-shell using the new virtual environment by calling:

poetry shell


Now, you can start a python REPL to use the library interactively, issue the bash sem program, run tests and compile the documentation of your local copy of sem.

## Running tests

This project uses the pytest framework for running tests. Tests can be run, from the project root, using:

python -m pytest --doctest-glob='*.rst' docs/
python -m pytest -x -n 3 --doctest-modules --cov-report term --cov=sem/ ./tests


These two commands will run, respectively, all code contained in the docs/ folder and all tests, also measuring coverage and outputting it to the terminal.

Since we are mainly testing integration with ns-3, tests require frequent copying and pasting of folders, ns-3 compilations and simulation running. Furthermore, documentation tests run all the examples in the documentation to make sure the output is as expected. Because of this, full tests are far from instantaneous. Single test files can be targeted, to achieve faster execution times, by substituting ./tests in the second command with the path to the test file that needs to be run.

## Building the documentation

Documentation can be built locally using the makefile's docs target:

make docs


## Running examples

The scripts in examples/ can be directly run:

python examples/wifi_example.py


## Installing SEM in pip's editable mode

pip currently requires a setup.py file to install projects in editable mode.

As explained here, poetry actually already generates a setup.py. After building the project, you can extract the file from the archive using the following command:

tar -xvf dist/*.tar.gz --wildcards --no-anchored '*/setup.py' --strip=1


After this step, it becomes possible to install SEM in editable mode.

Davide Magrin

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