Of course I have this running though it's still running older version (been too busy with developing this). It has been running over half a year for my scrapers without a single interruption even though the machine has the worst specs available. I have tested this with Linux/Unix and Windows at least. Of course, I have gotten message from various people saying they are using it. Some have said they migrated from Celery or other alternatives as they found Rocketry more suitable for their needs.

And that's true: it's 100% Python and basically there is a main loop that checks starting conditions of tasks (and some other things) and if a task's starting condition is reached, the task is run. Tasks can be executed synchronously by setting execution as "main" or concurrently with async, threading or multiprocessing. Maybe in the future with another interpreter as well. The main loop is left running in background.

So in short, it's a Python that's constantly loop running. It sleeps defined amount of time after checking a set of tasks to lower the resource consumption but you can also create a task with execution as "main" and do sophisticated sleep like "sleep more when CPU usage is X%" or estimate the time when the next task should start from the tasks' conditions.

And thanks for the positive comment!