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The ALICE O2 software repository contains the framework, as well as the detector specific, code for the reconstruction, calibration and simulation for the ALICE experiment at CERN for Run 3 and 4. It also encompasses the commonalities such as the data format, and the global algorithms like the global tracking. Other repositories in AliceO2Group contain a number of large common modules, for instance for Monitoring or Configuration.


The main entry point for O2 information is here. A quickstart page can be found under

Building / Installation

In order to build and install O2 with aliBuild you can follow this tutorial.

Issue tracking system

We use JIRA to track issues. Report a bug here. Add the JIRA issue key (e.g. O2-XYZ) to the PR title or in a commit message to have the PR/commit appear in the JIRA ticket.

Coding guidelines

The Coding Guidelines are here. See below how to format your code accordingly.


Documentation pages:

make doc will generate the doxygen documentation. To access the resulting documentation, open doc/html/index.html in your build directory. To install the documentation when calling make install turn on the variable DOC_INSTALL.

Doxygen documentation is also available online here

Build system (cmake) and directory structure

The code organisation is described here. The build system (cmake) is described here.


Rules and instructions are available in the repository CodingGuidelines.