.. Copyright 2022 Max Planck Institute for Software Systems, and National University of Singapore .. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: .. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. .. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. .. _sec-howto: ################################### How To ################################### .. _sec-howto-createrun: ****************************** Create and Run an Experiment ****************************** Experiments are defined in a declarative fashion inside Python modules using classes. Basically, create a `.py` file and add a global variable ``experiments``, a list which contains multiple instances of the class :class:`simbricks.orchestration.experiments.Experiment`, each one describing a standalone experiment. This is very helpful if you wish to evaluate your work in different environments, for example, you may want to swap out some simulator or investigate multiple topologies with different scale. The class :class:`~simbricks.orchestration.experiments.Experiment` provides methods to add the simulators you wish to run. All available simulators can be found in the module :mod:`simbricks.orchestration.simulators`. Instantiating :class:`~simbricks.orchestration.simulators.HostSim` requires you to specify a :class:`~simbricks.orchestration.nodeconfig.NodeConfig`, which contains the configuration for your host, for example its networking settings, how much system memory it should have, and most importantly, which application to run by assigning an :class:`~simbricks.orchestration.nodeconfig.AppConfig`. You can find predefined classes for node and app configs in the module :mod:`simbricks.orchestration.nodeconfig`, feel free to add new ones or just create a new class locally in your experiment's module. The last step to complete your virtual testbed is to specify which virtual components connect to each other. You do this by invoking the respective methods on the simulators you have instantiated. See the different simulator types' base classes in the module :mod:`~simbricks.orchestration.simulators` for more information. A simple and complete experiment module in which a client host pings a server can be found :ref:`below `. If you plan to simulate a topology with multiple hosts, it may be helpful to take a look at the module :mod:`simbricks.orchestration.simulator_utils` in which we provide some helper functions to reduce the amount of code you have to write. Finally, to run your experiment invoke ``/experiments/run.py`` and provide the path to your experiment module. In our docker containers you can just use the following command from anywhere: .. code-block:: bash $ simbricks-run --verbose --force ``--verbose`` prints all simulators' output to the terminal and ``--force`` forces execution even if there already exist result files for the same experiment. If ``simbricks-run`` is not available, you can always do .. code-block:: bash # from the repository's root directory $ cd experiments $ python run.py --verbose --force While running, you can interrupt the experiment using CTRL+C in your terminal. This will cleanly stop all simulators and collect their output in a JSON file in the directory ``experiments/out/``. These are the necessary basics to create and run your first experiment. Have fun. .. literalinclude:: /../experiments/pyexps/simple_ping.py :linenos: :lines: 25- :language: python :name: simple_ping_experiment :caption: A simple experiment with a client host pinging a server, both are connected through a switch. The setup of the two hosts could be simplified by using :func:`~simbricks.orchestration.simulator_utils.create_basic_hosts`. .. _sec-howto-nodeconfig: ******************************** Add a Node or Application Config ******************************** ****************************** Add a Custom Image ****************************** ****************************** Integrate a New Simulator ****************************** The simulator to be integrated should have its SimBricks adapter ready. Here we assume you already implemented SimBricks adapter for the simulator. Please refer to :ref:`Simulator Adapters ` Section for more detail about how a SimBricks adapter works and how someone can implement it. The next step is to add the command for launching the simulator to the orchestration framework. The class :class:`~simbricks.orchestration.simulators.Simulator` in ``experiments/simbricks/orchestration/simulators.py``, provides methods to set the command and configure the parameters to the simulator. There are several child classes inheriting from class :class:`~simbricks.orchestration.simulators.Simulator` including :class:`~simbricks.orchestration.simulators.PCIDevSim`, :class:`~simbricks.orchestration.simulators.NICSim`, :class:`~simbricks.orchestration.simulators.NetSim`, :class:`~simbricks.orchestration.simulators.HostSim` etc. You can create a new class for your simulator inheriting from one of these classes according to the simulator's category. Below is an example of adding a class for ``NS3`` simulator. .. literalinclude:: /../experiments/simbricks/orchestration/simulators.py :linenos: :lineno-start: 585 :lines: 585 - 598 :language: python :name: NS3 simulator class :caption: NS3 simulator class ****************************** Add a New Interface ****************************** .. autoclass:: simbricks.orchestration.experiments.Experiment :members: add_host, add_pcidev, add_nic, add_network .. automodule:: simbricks.orchestration.simulators .. autoclass:: simbricks.orchestration.simulators.HostSim :members: add_pcidev, add_nic, add_netdirect .. autoclass:: simbricks.orchestration.simulators.NICSim :members: set_network .. autoclass:: simbricks.orchestration.simulators.NetSim :members: connect_network .. automodule:: simbricks.orchestration.nodeconfig .. autoclass:: simbricks.orchestration.nodeconfig.NodeConfig :members: .. autoclass:: simbricks.orchestration.nodeconfig.AppConfig :members: .. automodule:: simbricks.orchestration.simulator_utils :members: