How s-tui compute Power Consumption of package, core and other stuff ?

[kuolemaaa]

Is there a resource on the sysfs that tells the instantaneous power ?
Is there a way to know where it get this information ?
I'm not talking about a laptop, notebook or something with batteries. I'm talking about on a classic desktop computer (intel)

[amanusk]

You are welcome to inspect the code :)
The power is read from dedicated Intel and AMD registers. On Intel this is called Intel RAPL. It is quite well documented.

RAPL does not rely on battery drainage to estimate power.

It used to be possible to read these registers w/o root access, but this was changed in more recent Linux kernels, as it exposes a side channel security risk.

[kuolemaaa]

On Intel this is called Intel RAPL

Is that the thing on /sys/class/powercap/intel-rapl ? I found measurements of energy consumed since I don't know. I didn't find any instant power absorption

I gathered all my courage and inspected the code and it seems it was as I feared: difference between two energy reading divided by time interval.

as it exposes a side channel security risk.

very cool