I noticed that if you have too few pm_children set then some requests hang until timeout. This surprised me - I’d expect an immediate error, but it’s more like a tarpit! For ages I was thinking my server was not performant, then I noticed via top that it wasn’t doing or waiting while the browser was.

I have two questions:

1. If you have pm_max_children=1 and you occupy that and submit another request, what actually happens? (I’m proxying through nginx.) HTTP doesn’t have a “40_ Come back later”.

2. (if life deals you lemons…) if you can generate a tarpit that doesn’t use server resources, this could be quite useful to know about too!