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

[Bengt Richter]

Hi Chris and Matteo,

On +2019-10-15 22:11:50 -0700, Bengt Richter wrote:
> 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 :) ...
> --

I note that lscpu only displays one core speed, not all of them.
lscpu is a prettified view of info from /proc/cpuinfo AFAIK,
but the latter shows all cpus:

grep '^cpu MHz' /proc/cpuinfo
right now gets me:

cpu MHz         : 2617.409
cpu MHz         : 2396.652
cpu MHz         : 2167.756
cpu MHz         : 2393.218
cpu MHz         : 2406.541
cpu MHz         : 2524.652
cpu MHz         : 2444.346
cpu MHz         : 2443.544

HTH
__
Regards,
Bengt Richter











> Regards,
> Bengt Richter
> 

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