| Issue |
EPJ Web Conf.
Volume 337, 2025
27th International Conference on Computing in High Energy and Nuclear Physics (CHEP 2024)
|
|
|---|---|---|
| Article Number | 01006 | |
| Number of page(s) | 6 | |
| DOI | https://doi.org/10.1051/epjconf/202533701006 | |
| Published online | 07 October 2025 | |
https://doi.org/10.1051/epjconf/202533701006
Thoroughly testing and integrating hundreds of Pull Requests per month: ROOT’s new Cost-efficient and Feature Rich GitHub-based CI
1 CERN, Geneva, Switzerland
2 Fermi National Laboratory, Batavia, U.S.A.
3 University of Princeton, Princeton, U.S.A.
* e-mail: danilo.piparo@cern.ch
** e-mail: axel.naumann@cern.ch
*** e-mail: shahzad.muzaffar@cern.ch
**** e-mail: ole.morud@cern.ch
† e-mail: pcanal@fnal.com
‡ e-mail: stephan.hageboeck@cern.ch
§ e-mail: vassil.vassilev@cern.ch
Published online: 7 October 2025
ROOT is an open source framework, freely available on GitHub, at the heart of data acquisition, processing and analysis of HE(N)P experiments, and beyond. It is developed collaboratively: contributions are not authored only by ROOT team members, but also by the user community at large: developers and scientists from universities, labs as well as the private sector. More than 1500 GitHub Pull Requests are merged on average per year. It is in this context that code integration acquires a primary role. The review of code contributions isn’t enough: not only they need to be thoroughly reviewed, they also need to be thoroughly tested through a powerful CI infrastructure on several different platforms to comply with the high code quality standards of the project. Since the end of 2023, ROOT moved its continuous integration system from Jenkins to GitHub Actions. In this contribution, we characterise the transition to the GitHub CI, focussing on our strategy, its implementation and the lessons learned, as well as the advantages the new system offers with respect to the previous one. Particular emphasis will be given to the evaluation of the cost-benefit ratio for Jenkins and GitHub Actions for the ROOT project. We also describe how we manage to run in less than one hour thousands of unit, integration, functional and end-to-end tests on different flavours of Windows, four versions of macOS, as well as about ten of the most used Linux distributions, taking advantage of the CERN computing infrastructure.
© The Authors, published by EDP Sciences, 2025
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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