I forgot Devuan is the fork of Debian with Systemd stripped out.
Well, it is. Install and configure Open MPI or MPICH on multiple connected Devuan Beowulf systems and you have a Beowulf cluster. As a bonus, your new Beowulf cluster is systemd free.
Not really a bonus in my book, but I am sure it is for some folks.
I forgot Devuan is the fork of Debian with Systemd stripped out.