Under the hood, it uses good ol' fork and keeps track of the generated process IDs. It's surprisingly simple. You can check out the relevant source here: https

Under the hood, it uses good ol' fork and keeps track of the generated process IDs. It's surprisingly simple. You can check out the relevant source here: https://github.com/rails/solid_queue/blob/main/lib%2Fsolid_queue%2Fsupervisor.rb#L77-L89 https://github.com/rails/solid_queue/blob/main/lib%2Fsolid_q...