efootprint 21.1.2

Digital service environmental footprint model

e-footprint model

A toolkit for exhaustively modeling the environmental impact of digital services.

The current perimeter is the carbon footprint associated with the fabrication and usage of servers, storage, network (usage only) and end-user devices necessary for the existence of a web digital service. It is also now possible to model the production of edge devices (like video game consoles, smartphones, servers, etc.) and describe the unitary usage by device over its usage phase, to get the environmental footprint of the deployed fleet. Edge devices support hierarchical grouping via EdgeDeviceGroup with per-component unit multiplicity (nb_of_units), enabling complex fleet structures with nested device and sub-group counts.

Other environmental impacts (water, rare earth metals, etc.) will be added soon through an integration with the Boavizta API, and the lifecycle phases of device transportation and end of life are currently considered negligible.

Getting started

Installation

Check out INSTALL.md.

Documentation

Here is the link to the e-footprint documentation. There you will find a description of all the e-footprint objects, their parameters, the relationship between the objects and the calculated attributes and their graphs.

Graphical interface

You can explore the model’s graphical interface, which is also open source and found in the Boavizta e-footprint interface repository. Please send an email to e-footprint’s main maintainer, Vincent Villet if you wish to give feedback !

Modeling examples

Checkout our open source e-footprint modeling use cases.

Tutorial

pip install efootprint

You can then run the jupyter notebook tutorial to familiarize yourself with the object logic and generate an object relationship graph and a calculation graph as HTML files in the current folder.

Object relationships graph: usage patterns in deep blue, user journey in blue, user journey steps in pale blue, jobs in gold, infra hardware in red. Hover over a node to get the numerical values of its environmental and technical attributes. For simplifying the graph the Network and Hardware nodes are not shown.

Calculation graph: user inputs in gold, hypothesis in darkred, and intermediate calculations in pale blue. Hover over a node to read the formula.

To launch jupyter:

# Todo once to setup jupyter kernel
poetry run ipython kernel install --user --name=efootprint-kernel
# Start Jupyter server with poetry
poetry run jupyter notebook tutorial.ipynb

Dev setup

Check out INSTALL.md.

Code logic

The code has been architectured to separate modeling from optimization from API logic. The goal is to make contribution to the modeling logic as straightforward as possible.

• Modules that deal with modeling logic are located in efootprint/core.
• Optimizations (having the model rerun the right calculations whenever an input attribute or a link between objects changes) are dealt with in efootprint/abstract_modeling_classes.
• All json serialization / deserialization logic, that is essential for making the web interface work, are found in efootprint/api_utils.

Contributing

Check out CONTRIBUTING.md

License

GNU Affero General Public License v3.0