Re: fftwf tests running for 25+ hours - is this normal?

[Bengt Richter]

On +2019-10-15 11:32:38 -0700, Chris Marusich wrote:
> Hi Bengt and Matteo,
> 
> Bengt Richter <address@hidden> writes:
> 
> > Have you checked sensors for overheating that might induce CPU clock 
> > throttling?
> 
> Actually, yes, I happened to be watching dmesg output at the time, and I
> did notice these messages (no similar messages have been printed since
> then, which was many hours ago):
> 
> --8<---------------cut here---------------start------------->8---
> [180270.045081] mce: CPU1: Core temperature above threshold, cpu clock 
> throttled (total events = 124733)
> [180270.045567] mce: CPU1: Core temperature/speed normal
> [180570.044352] mce: CPU1: Core temperature above threshold, cpu clock 
> throttled (total events = 134902)
> [180570.044838] mce: CPU1: Core temperature/speed normal
> [180875.663432] mce: CPU1: Core temperature above threshold, cpu clock 
> throttled (total events = 143897)
> [180875.663918] mce: CPU1: Core temperature/speed normal
> [181175.748616] mce: CPU1: Core temperature above threshold, cpu clock 
> throttled (total events = 153503)
> [181175.749103] mce: CPU1: Core temperature/speed normal
> [181476.496915] mce: CPU1: Core temperature above threshold, cpu clock 
> throttled (total events = 171377)
> [181476.497401] mce: CPU1: Core temperature/speed normal
> [181776.914264] mce: CPU1: Core temperature above threshold, cpu clock 
> throttled (total events = 185828)
> [181776.914751] mce: CPU1: Core temperature/speed normal
> [182076.914391] mce: CPU1: Core temperature/speed normal
> [182377.322112] mce: CPU1: Core temperature above threshold, cpu clock 
> throttled (total events = 231578)
> [182377.322598] mce: CPU1: Core temperature/speed normal
> --8<---------------cut here---------------end--------------->8---
> 
> Is this throttling permanent, or is the throttling released after the
> temperature returns to normal?

In my case, throttling ceased as soon as temps normalized.
If it happens to me again, I will try

lscpu|grep -i '^CPU m'

to see if the throttling is shown in the first number
which right now gets me:

CPU MHz:                         2697.781
CPU max MHz:                     3500.0000
CPU min MHz:                     800.0000

again:

CPU MHz:                         2102.444
CPU max MHz:                     3500.0000
CPU min MHz:                     800.0000

Yeah, so that first number is a current sample.
So I guess 800 could make something run 3x or more longer.

... Hm. I think I am going to see about dust-bunnies in the air ducts :) ...
--
Regards,
Bengt Richter