[elric]

> you're almost always going to have some sort of singleton object somewhere in your application which just has these three pools, pre-configured for use

I'm bemused by this statement, and I can't figure out whether this is an assertion rooted in supreme confidence, or just idle, wishful thinking.

That being said, giving threading advice in a virtualized and containerized world is tricky. And while these three categories seem sensible, mapping the functions of any non-trivial system onto them is going to be difficult, unless the system was specifically designed around it.