[1996]

Can't say about listeners. But connection poolers introduced more problems than I cared to fix. So now I routinely use 3000 connections, and have 9000 set up for peaks. It eats a little more ram but it is more stable.

[takeda]

connections aren't free[1] after reducing number of connections from 200 to 60 my commit throughput doubled.

[1] https://brandur.org/postgres-connections

[taffer]

> It eats a little more ram but it is more stable.

It also eats a lot more cpu cycles:

https://www.youtube.com/watch?v=xNDnVOCdvQ0

[directionless]

It's a good route, if you're running your own. I'm mostly in clouds, and they've got lower limits