GNU bug report logs - #45751
[feature/native-comp] emacs keeps running 100% of CPU

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From: Édouard Debry <edouard.debry <at> gmail.com>
To: Andrea Corallo <akrl <at> sdf.org>
Cc: 45751 <at> debbugs.gnu.org
Subject: bug#45751: [feature/native-comp] emacs keeps running 100% of CPU
Date: Mon, 11 Jan 2021 00:10:46 +0100

On lun., janv. 11 2021, Édouard Debry wrote:
> On dim., janv. 10 2021, Andrea Corallo wrote:
>> Édouard Debry <edouard.debry <at> gmail.com> writes:
>>
>>> I noticed that when launching emacs on linux (debian buster),
>>> it keeps on running 100% of the CPU and seems to gradually eat 
>>> all
>>> memory, approximately 1-2% every minute.
>>>
>>> It seems related to native compiling. In the
>>> *Async-native-compile-log* I read :
>>>
>>> <=============================>
>>> Compiling
>>> /home/edouard/.emacs.d/elpa/color-theme-sanityinc-solarized-20200805.603/color-theme-sanityinc-solarized.el...
>>
>> I see a similar issue with sanityinc-tomorrow.el, the 
>> compilation is way
>> slower than any other one but it completes eventually.  I guess 
>> is the
>> same issue you see and with sufficient RAM also 
>> sanityinc-solarized
>> should complete.
>>
>> In case of of sanityinc-tomorrow I think is because of
>> `color-theme-sanityinc-tomorrow'.  This is a single function 
>> that after
>> macro expansion becomes enormous.
>>
>> We need to make the compiler robust against these corner cases, 
>> I'll
>> have a look this week into adding some logic for that.
>>
>> Thanks
>>
>>   Andrea
>
> I have waited for approximately one hour and until linux became 
> totally unresponsive, I
> had to reboot.
>
> I am not 100% sure it is because of emacs compiling the color 
> theme package and eating
> all memory,
> but I never had such a crash on linux since I own this laptop 
> and I had exactly the same
> crash on
> windows 10 with emacs native-comp eating all memory.
>
> So most probably, my previous bug is related to that. I could 
> try another theme and see
> if this still happens.
>
> Regards

Also, is there a way to prevent emacs native-comp to compile some 
packages, some kind
of blacklist. I would prefer at the moment because I am used to 
this color theme.

Do you think there may be a noticeable difference on emacs's 
performance between a
color theme natively compiled (*eln) or just byte compiled (*elc)

Regards

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