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Fix #440

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> According to [this](https://github.com/foxlet/macOS-Simple-KVM/issues/319#issuecomment-1003775896), macOS only supports power-of-two cores. But you can increase the number of sockets to get the virtual cores you need.
> 
> If you need 6 cores, go with:
> 
> ```
> -e EXTRA='-smp 6,sockets=3,cores=2'
> ```
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@ -642,13 +642,15 @@ Or
#### Use more CPU Cores/SMP
This will use all available cores; adjust accordingly to the day of the week:
Examples:
```
-e CPU_STRING=$(nproc) \
```
`-e EXTRA='-smp 6,sockets=3,cores=2'`
This will use `-smp $(nproc)`
`-e EXTRA='-smp 8,sockets=4,cores=2'`
`-e EXTRA='-smp 16,sockets=8,cores=2'`
Note, unlike memory, CPU usage is shared. so you can allocate all of your CPU's to the container.
### Confirm your user is part of the the Docker group, KVM group, libvirt group