bug#45898: 27.1; wedged in redisplay again

["Gerd Möllmann" <gerd.moellmann@gmail.com>]

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> On 2022-07-01,, at 8:04 , Eli Zaretskii <eliz@gnu.org> wrote:
> 
>> Would it be possible to run this with gprof profiling?  I think that could give some clues what is going on.
> 
> Or (on GNU/Linux only) under 'prof' -- which doesn't require you to
> build a special version of Emacs, and still produces detailed CPU
> usage info.

No one will care, that's why I'm telling:

I just found a way to profile Emacs on macOS 12.4, with Apple M1 chip, using Xcode 13.4.1.  Please see the attached shell script.  It seems that Gprof is not supported on my platform, like GDB.

I'm not yet sure how useful/reliable and whatnot that is, but it looks promising, and it doesn't require building with special compiler flags (I used -g -O0).


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#! /bin/sh

# Execution profile for Emacs on macOS.
#
# Xcode command-line tools must be installed (use xcode-select
# --install).
#
# Build Emacs with -g.  Install Emacs with 'make install' which copies
# stuff to nextstep/Emacs.app

# Assume we are inside a Git repo.  Chdir to its root.
# Note that .git might be a file when in a git worktree.
while [ ! -e .git ]; do
    cd ..
    if [ `pwd` == "!HOME" ]; then
	echo "$0: Not in a Git repo"
	exit 1
    fi
done

# Check if app was built
if [ ! -d ./nextstep/Emacs.app ]; then
    echo "$0: Cannot find Emacs.app directory"
    exit 1
fi
cd ./nextstep/Emacs.app

# Directory where to store xctrace outout
trace_dir=Xctrace
if [ ! -d "$trace_dir" ]; then
    mkdir "$trace_dir"
fi

# Trace and show the result in Instruments
trace=`xcrun xctrace record --template="Time Profiler" --target-stdout - \
 	      --output "$trace_dir" --launch -- ./Contents/MacOS/Emacs \
	     | grep Output | cut -d : -f 2 | sed -e 's/^ //' -e 's/.$//'`
echo "Trace file is $trace_dir/$trace"
open /Applications/Xcode.app/Contents/Applications/Instruments.app \
     "$trace_dir/$trace"



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