From: Eli Zaretskii <eliz@gnu.org>
To: Stefan Kangas <stefankangas@gmail.com>
Cc: ben@bensimms.moe, 73563@debbugs.gnu.org
Subject: bug#73563: [Ben Simms] Performance bottleneck in ns_draw_fringe_bitmap
Date: Mon, 30 Sep 2024 15:26:31 +0300 [thread overview]
Message-ID: <86plol2uq0.fsf@gnu.org> (raw)
In-Reply-To: <CADwFkmn9fhiU7XfXu5Ku+ouuxH=J+cx73n-APP7Gkq4FdywD0g@mail.gmail.com> (message from Stefan Kangas on Mon, 30 Sep 2024 07:21:03 +0000)
> Cc: Ben Simms <ben@bensimms.moe>
> From: Stefan Kangas <stefankangas@gmail.com>
> Date: Mon, 30 Sep 2024 07:21:03 +0000
>
> Hi all, I recently started using Emacs (ns) HEAD on an ARM macos sonoma
> system.
>
> I've noticed that ns_draw_fringe_bitmap is a fairly large performance sink
> when using pixel scrolling (to the point of 99% of cpu time being inside this
> function, with Emacs drawing at approx 5Hz). The slowness here isn't as
> obvious when not pixel scrolling, presumably because Emacs never tries to
> redraw at 60+Hz otherwise.
>
> I have performed some profiling and discovered that in my observed worse case
> situation, of the 99% of cpu time spent in ns_draw_fringe_bitmap, approx 50%
> is spent in [NSBezierPath copy], and approx 30% in [NSBezierPath fill].
According to the posted profile, ns_draw_fringe_bitmap takes much less
than 99% of CPU time, somewhere around 10%. What am I missing?
prev parent reply other threads:[~2024-09-30 12:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-26 11:56 Performance bottleneck in ns_draw_fringe_bitmap Ben Simms
2024-08-05 9:36 ` Mattias Engdegård
2024-09-30 7:21 ` bug#73563: [Ben Simms] " Stefan Kangas
2024-09-30 12:26 ` Eli Zaretskii [this message]
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