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

[Édouard Debry]

On lun., janv. 11 2021, Andrea Corallo wrote:
> Édouard Debry <edouard.debry@gmail.com> writes:
>
> > On lun., janv. 11 2021, Édouard Debry wrote:
> > > On dim., janv. 10 2021, Andrea Corallo wrote:
> > > > Édouard Debry <edouard.debry@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.
>
> Yes, `comp-deferred-compilation-deny-list'.

Thanks ! In fact I just discovered this settings as you answered 
me and

(require 'comp)
(setq comp-deferred-compilation-deny-list '("color-theme-*"))

in my init file does the job.

> > 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)
>
> I don't think so.
>
>   Andrea