A job is run in a worker thread or as a child process ? It reuses the thread / process in subsequent runs?

[blikblum]

In readme and in this comment #88 (comment) points to worker thread but could not find importing 'worker_threads' module in codebase

I am asking because i use playwright that is know to have memory leaks in long runs and would be good to control if thread / process is reused or not.

[GiovaniGuizzo]

Hey @blikblum.

The main engine runs in a child process, and then it spawns worker threads using Piscina.
The threads are reused, but they have an idle timeout and are killed if idle for too long.

[blikblum]

Thanks.

If i set idleWorkerTimeout to 0, the worker will be killed, even if there's already a job queued?

[GiovaniGuizzo]

Yes, if you set it to 0, every time a worker finishes processing a job, it will be killed and a new one will be created when needed. If you set it to >0, workers will be reused. >0 means more performance, ===0 means more isolation.