GNU bug report logs -
#47711
27.1; Deferred highlighting support in `completion-all-completions', `vertico--all-completions`
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Reported by: Daniel Mendler <mail <at> daniel-mendler.de>
Date: Sun, 11 Apr 2021 20:52:01 UTC
Severity: normal
Found in version 27.1
Done: Daniel Mendler <mail <at> daniel-mendler.de>
Bug is archived. No further changes may be made.
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> From: Dmitry Gutov <dgutov <at> yandex.ru>
> Date: Sat, 14 Aug 2021 05:55:17 +0300
> Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 48841 <at> debbugs.gnu.org,
> 47711 <at> debbugs.gnu.org
>
> On 13.08.2021 15:05, João Távora wrote:
> > If one removes these lines, the process becomes much faster, but there is a
> > problem with highlighting. My idea is indeed to defer highlighting by not
> > setting the 'face property directly on that shared string, but some
> > other property
> > that is read later from the shared string by compliant frontents.
>
> I haven't done any direct benchmarking, but I'm pretty sure that this
> approach cannot, by definition, be as fast as the non-mutating one.
Daniel seems to think otherwise, AFAIU.
> Because you go through the whole list and mutate all of its elements,
> you have to perform a certain bit of work W x N times, where N is the
> size of the whole list.
>
> Whereas the deferred-mutation approach will only have to do its bit
> (which is likely more work, like, WWW) only 20 times, or 100 times, or
> however many completions are displayed. And this is usually negligible.
>
> However big the difference is going to be, I can't say in advance, of
> course, or whether it's going to be shadowed by some other performance
> costs. But the non-mutating approach should have the best optimization
> potential when the list is long.
So I guess the suggestion to have a benchmark is still useful, because
the estimations of which approach has better performance vary between
you three. So maybe producing such benchmarks would be a good step?
This bug report was last modified 172 days ago.
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