Tor does not scale well on multi-core machines, this is why fast relays run
multiple tor instances on a single server.

Most packages for other Linux Distributions (Debian, Ubuntu, Fedora, CentOS,
...) ship a multi-instance systemd service file to support multiple tor
instances.

openSUSE currently does not ship such a systemd service file but it would not
require much.

You can have a look at Fedora's multi-instance service file here:
http://pkgs.fedoraproject.org/cgit/rpms/tor.git/tree/tor@.service


The important part is that a package update restarts all tor instances.

General information on systemd multi-instance support:
http://0pointer.de/blog/projects/instances.html

I'm happy to test any multi-instance service files.