Better support for hybrid CPUs -> and remove fractional cores ?

[KernAttila]

The problem

The current implementation supports full single-threaded/hyper-threaded processors, but does not report hybrid cpus correctly. I have 3 procs:

• AMD Ryzen9 9600HX : 8 Cores - 16 Threads
• Intel i9-11900K : 8 Cores - 16 Threads
• Intel i9-12900HK: 14 Cores - 20 Threads (6 PCores(x2) + 8 ECores)

CueGui:

As seen in CueGui, the first two are ok and reports 8 Cores as expected. But the last one reports 20 Cores instead of 14.

Describe the enhancement

• either fix rqd to correctly report all the physical cores ?
  • (at the risk of not being able to see which one are HT)
• or report logical cores instead of physical cores ?

I would see some benefits to having logical cores reported (please correct my assumptions if they seem false):

• remove the need for "fractional" cores, all values will be coherent and not multiples of 100 (this is very strange on first encounter).
  • (Is there some history on why we have multiples of 100 ?)
• a HT host could handle more small jobs instead of reserving 2 logical cores per small task.
• Have the same number of cores users can see in htop or task manager.

And some potential downfalls:

• Change the core requirement habits : instead of requiring 8 cores, we would need to require 16
  • or even more than 16 on specialized non-x86 CPU architectures like IBM Power.
  • (though 0 or negative would be acceptable req from now on)

Version Number 1.0

[DiegoTavares]

As discussed on the TSC, we should change the GUI to display Physical Cores and Virtual Cores to avoid confusion.