[erlang-questions] Dirty CPU schedulers stuck at zero utilization

Jesse Stimpson <>
Tue Jan 15 23:11:38 CET 2019


Behavior of the schedulers appears to have the same issue with 2093 patch.

But I did notice something new in the msacc output. There is a very brief
period, at approx the same time as the normal schedulers usage spikes,
where all the dirty cpu schedulers have a significant sleep time. I've
included timestamped excerpts below, starting with the increase in dirty
cpu sleep, and ending with a "steady state" utilization.

        Thread      aux check_io emulator       gc    other     port
sleep

{{2019,1,15},{21,57,34}}
dirty_cpu_( 1)    0.00%    0.00%   26.80%    0.00%   22.75%    0.00%
 50.45%
 scheduler( 1)    0.17%    0.00%   98.22%    0.50%    0.18%    0.77%
0.16%

{{2019,1,15},{21,57,36}}
dirty_cpu_( 1)    0.00%    0.00%   76.92%    0.00%   17.73%    0.00%
5.35%
 scheduler( 1)    0.61%    0.00%   94.20%    1.23%    0.61%    3.35%
0.00%

{{2019,1,15},{21,57,38}}
dirty_cpu_( 1)    0.00%    0.00%   87.16%    0.00%    6.52%    0.00%
6.31%
 scheduler( 1)    0.94%    0.14%   93.72%    1.51%    0.63%    2.84%
0.22%

{{2019,1,15},{21,57,39}}
dirty_cpu_( 1)    0.00%    0.00%   87.92%    0.00%    6.85%    0.00%
5.23%
 scheduler( 1)    0.98%    0.14%   90.88%    1.32%    3.71%    2.71%
0.26%

{{2019,1,15},{21,57,40}}
dirty_cpu_( 1)    0.00%    0.00%   67.47%    0.00%   19.51%    0.00%
 13.02%
 scheduler( 1)    1.09%    0.17%   81.95%    1.07%   12.01%    3.08%
0.64%

{{2019,1,15},{21,57,41}}
dirty_cpu_( 1)    0.00%    0.00%   64.25%    0.00%   18.86%    0.00%
 16.88%
 scheduler( 1)    0.99%    0.28%   74.67%    0.98%   19.56%    2.80%
0.71%

Thank you for the continuing support!

Jesse


On Tue, Jan 15, 2019 at 4:14 PM Jesse Stimpson <
> wrote:

> My apologies as I've been distracted by other matters recently. I hope to
> be able to report back within the next few days.
>
> Thanks
>
> On Tue, Jan 15, 2019 at 12:18 PM Frank Muller <>
> wrote:
>
>> Hello Jesse
>>
>> Did Rickard’s patch (PR-2093) fixed your Dirty scheduler issue?
>>
>> Best
>> /Frank
>>
>> Please try the fix in PR-2093 <https://github.com/erlang/otp/pull/2093>
>>>
>>> Regards,
>>> Rickadr
>>> --
>>> Rickard Green, Erlang/OTP, Ericsson AB
>>> _______________________________________________
>>> erlang-questions mailing list
>>> 
>>> http://erlang.org/mailman/listinfo/erlang-questions
>>>
>>
>
> --
>
> <http://www.republicwireless.com/>
>
> Jesse Stimpson
>
> Site Reliability Engineering
>
> m: 9199950424 <(919)%20995-0424>
> RepublicWireless.com <https://republicwireless.com/>
>


-- 

<http://www.republicwireless.com/>

Jesse Stimpson

Site Reliability Engineering

m: 9199950424 <(919)%20995-0424>
RepublicWireless.com <https://republicwireless.com/>
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