Re: The Emacs master is much slower than the emacs-27 branch.

[Stephen Berman]

On Fri, 04 Dec 2020 17:51:03 +0200 Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Stephen Berman <stephen.berman@gmx.net>
>> Cc: acm@muc.de,  emacs-devel@gnu.org
>> Date: Fri, 04 Dec 2020 15:05:54 +0100
>>
>> > I just rebuilt emacs-27 with "make bootstrap", reran the benchmark, and
>> > it took ~60 seconds, about a second faster than the previous
>> > non-bootstrapped build.  The profile is similar to the previous one from
>> > emacs-27, but I've attached for your perusal anyway.  I'll bootstrap
>> > master too and run the benchmark there again.
>>
>> On freshly bootstrapped master the benchmark took the same time as
>> before, ~21 seconds, and the profile looks pretty much the same, so I
>> haven't attached it, but will send it if you want to see it.
>
> Thanks.  This is very strange.  What are the build options and the
> features in each build? are they identical?

emacs-27:

system-configuration-options
"'CFLAGS=-Og -g3' PKG_CONFIG_PATH=/opt/qt5/lib/pkgconfig"

system-configuration-features
"XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS GLIB NOTIFY INOTIFY ACL
GNUTLS LIBXML2 FREETYPE HARFBUZZ XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11
XDBE XIM MODULES THREADS LIBSYSTEMD PDUMPER LCMS2 GMP"

master:

system-configuration-options
"--with-xwidgets 'CFLAGS=-Og -g3' PKG_CONFIG_PATH=/opt/qt5/lib/pkgconfig"

system-configuration-features
"XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS LIBSYSTEMD PDUMPER LCMS2"