Comments on: How to monitor cpu power consumption in watts on Ubuntu https://www.binarytides.com/monitor-cpu-power-consumption-on-ubuntu/ News, Technology, Entertainment and more Wed, 06 Sep 2023 14:41:17 +0000 hourly 1 https://wordpress.org/?v=6.8.2 By: Silver Moon https://www.binarytides.com/monitor-cpu-power-consumption-on-ubuntu/comment-page-1/#comment-359143 Wed, 06 Sep 2023 14:41:17 +0000 https://www.binarytides.com/?p=14156#comment-359143 In reply to Samuel.

that’s a good idea, specially for a “mobile” form factor device that can tell its heat levels through body touch.

]]> By: Samuel https://www.binarytides.com/monitor-cpu-power-consumption-on-ubuntu/comment-page-1/#comment-358946 Fri, 01 Sep 2023 08:46:01 +0000 https://www.binarytides.com/?p=14156#comment-358946 This is interesting, thanks to turbostat I can see the C-states in a nice table. But I am not sure about the absolute values, especially with only the Watts for “pkg”. With “perf stat” there is also a “psys”. Here two lines from a one-second-run, 1 Joule = 1 Watt/second:

1.26 Joules energy-psys
0.80 Joules energy-pkg
…

Even this energy-psys only “reflects” the Watts indicated by my real (external) power meter. I read between 2.8 – 4.2 W depending on the kernel/distro. Good idling is with 3.2W real, 1W psys and a cool case. Not-so-good is 3.8W real, 3W psys and “feverish” case after 15 minutes. I am not even convinced the power meter manages to measure the (variable?) current precisely.

25 W noturbo, 75% pstate limit
4.0 W minimal activity / bad idling
3.2 W good idling (can even stay at 2.8 W – but how exactly?!?)
1.8 W “freeze”
1.1 W suspend-to-ram
0.9 W (!) Main power Off

This is with a 2017 intel nuc mini-pc. The numbers show you CAN get quite close to “freeze” system state. Feeling the warmth of the case is the best control, especially when the fan is not blowing (yet).

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