  Travis CI handles automatically thousands of builds every day to, amongst
other things, provide valuable feedback to thousands of open-source developers.
In this paper, we investigate Travis CI to firstly understand who is using it,
and when they start to use it. Secondly, we investigate how the developers use
Travis CI and finally, how frequently the developers change the Travis CI
configurations. We observed during our analysis that the main users of Travis
CI are corporate users such as Microsoft. And the programming languages used in
Travis CI by those users do not follow the same popularity trend than on
GitHub, for example, Python is the most popular language on Travis CI, but it
is only the third one on GitHub. We also observe that Travis CI is set up on
average seven days after the creation of the repository and the jobs are still
mainly used (60%) to run tests. And finally, we observe that 7.34% of the
commits modify the Travis CI configuration. We share the biggest benchmark of
Travis CI jobs (to our knowledge): it contains 35,793,144 jobs from 272,917
different GitHub projects.
