So it was just a weekend of coding so far, lots more to do. Right now I have everything hard coded to just split into half based on my example server of 64, 4, 400. If you look at the script:

https://github.com/andrewarrow/shellmates/blob/main/firecrac...

You can see lots of hard coded stuff just to get it to work at Hetzner on rockylinux9. I think I can make the script a lot more customizable in the UI and let you do all sort of fancy splits! Firecracker does support fractional CPU allocation through CPU shares and quota settings. When you configure a Firecracker microVM, you can specify:

CPU shares (relative weight)

CPU quota (maximum usage in microseconds per period)

CPU period (measurement period in microseconds)

As long as the server has rockylinux9 I think it should work anywhere!