Hi, I have been using thread-per-core (-T1C) maven flag for couple months when building engine on my machine. I have not seen any issues related to such parallel maven goals execution so I submitted a patch that enables it by default: https://gerrit.ovirt.org/#/c/107567/ The main benefit is significantly reduced build time ( ~30% in my case but it greatly depends on the hardware/vm you run the build on) Please let me know if you can think about any corner cases when this setting would cause some instability. Posting review comments would be the preferred option :) thanks! -- Artur Socha Senior Software Engineer, RHV Red Hat