GNU logs - #73563, boring messages

Message sent to ben@HIDDEN, bug-gnu-emacs@HIDDEN:

Subject: bug#73563: [Ben Simms] Performance bottleneck in ns_draw_fringe_bitmap
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--0000000000002a887a0623510c8e
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I'm forwarding this to the bug tracker so that we don't lose track of
it.

Original message:
https://lists.gnu.org/r/emacs-devel/2024-06/msg00900.html

-------------------- Start of forwarded message --------------------
From: Ben Simms <ben@HIDDEN>
Date: Wed, 26 Jun 2024 13:56:43 +0200
Subject: Performance bottleneck in ns_draw_fringe_bitmap
To: emacs-devel@HIDDEN

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--0000000000002a887a0623510c8e--

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Stefan Kangas <stefankangas@HIDDEN>
Subject: bug#73563: Acknowledgement ([Ben Simms] Performance bottleneck in
 ns_draw_fringe_bitmap)
Message-ID: <handler.73563.B.17276833795514.ack <at> debbugs.gnu.org>
References: <CADwFkmn9fhiU7XfXu5Ku+ouuxH=J+cx73n-APP7Gkq4FdywD0g@HIDDEN>
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Reply-To: 73563 <at> debbugs.gnu.org
Date: Mon, 30 Sep 2024 08:03:03 +0000

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Subject: bug#73563: [Ben Simms] Performance bottleneck in ns_draw_fringe_bitmap
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Resent-Date: Mon, 30 Sep 2024 12:28:02 +0000
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To: Stefan Kangas <stefankangas@HIDDEN>
Cc: ben@HIDDEN, 73563 <at> debbugs.gnu.org
Date: Mon, 30 Sep 2024 15:26:31 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <CADwFkmn9fhiU7XfXu5Ku+ouuxH=J+cx73n-APP7Gkq4FdywD0g@HIDDEN>
 (message from Stefan Kangas on Mon, 30 Sep 2024 07:21:03 +0000)
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> Cc: Ben Simms <ben@HIDDEN>
> From: Stefan Kangas <stefankangas@HIDDEN>
> 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?

Last modified: Sun, 12 Jan 2025 05:45:02 UTC

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