pgbounce max_client_conn and default_pool_size

[Yetkin Öztürk <yetkin85@xxxxxxxxx>]

What is the adequate pgbounce max_client_conn ,default_pool_size values for a postgres config which has max_connections = 400.

We want to move to pgbouncer to let postgres do the only db job but it confused us.  We have over 120 databases in a single postgres engine with as i said  max_connections = 400 .

120+ databases are driven from 3 separate web servers, we are planning to install pgbounce to three of them.

PS: in source code of pgbouncer it looks like opens separate fd's for max_client_conn * default_pool_size value.

Regards,

Yetkin Öztürk