Ben <bench(at)silentmedia(dot)com> writes:
> Why would that be a problem if each is configured to listen on different
> addresses?
Because if they're all on the same port number, they're all trying to
use the same Unix socket.
Now, if you are mostly interested in communicating with them over IP,
you could use unix_socket_directory to force their socket files into
different places. This'll be a PITA for local use of Unix socket
connections, but if that's what you want ...
regards, tom lane