> I don't think Plan 9 has a good "orchestration" story itself
I'm not super familiar with plan 9, but given what I do know, I'm pretty sure that could be done with an rc script. I'm pretty sure that a) you can fork processes after starting them on remote systems, and b) you can query remote systems to figure out which ones have free resources. Given that, it's just a shell / rc script away. Then you just need another script to do the management. ;)