[Cin] Rendering multi-threads

[Andrea paz]

I have a CPU 8 cores / 16 threads, but the final rendering uses only
one core. I tried with mp4/h264-5; webm/VP9; mkv/h264-5 e Prores. A 45
min video takes 3h 30m.
I tried adding the parameters "threads=15", "wpp" which should be
active by default and "frame-threads=3"; but the result is the same.
On average I do 15 fps.
Using h264-5 with nvenc takes 1h20m; but the CPU still uses only one
core. On average I make 115 fps.
Using an external engine (handbrake, which uses ffmpeg) you can use
both the Cpu and the GPU; the rendering will take 10m! (but with lower
quality).

Since I'm compiling CinGG (note: all threads are used for compiling),
maybe I need to enable some flags or something like that? Are there
any customizations to do? Or should I set something in the operating
system?

Another question: How do you configure the render farm to use only the
local CPU cores?