bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'

From	Eli Zaretskii <eliz@gnu.org>
Newsgroups	gnu.emacs.bug
Subject	bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'
Date	2020-09-03 21:24 +0300
Message-ID	<mailman.2226.1599157503.2469.bug-gnu-emacs@gnu.org> (permalink)
References	(17 earlier) <87eeniq5ln.fsf@igel.home> <m2y2lqzyjd.fsf@gmail.com> <83ft7yvk0k.fsf@gnu.org> <87a6y6oiju.fsf@igel.home> <83blimvhuv.fsf@gnu.org>

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> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Robert Pluim <rpluim@gmail.com>,  43177@debbugs.gnu.org,
>   emacs@Alexander.Shukaev.name
> Date: Thu, 03 Sep 2020 19:51:17 +0200
> 
> On Sep 03 2020, Eli Zaretskii wrote:
> 
> > Do we understand why including the x backend produces such a huge
> > delay?  Where is most of that time spent, and why?
> 
> My guess would be that probing fonts via the x backend is expensive due
> to round trips to the X server (and the X server is quite busy during
> that time).

If that is the reason, I guess we should try to minimize the number of
fonts for which this is done.  Like, for example, set up some data
structure to be consulted when a deciding whether a given font should
be used with the x backend.  After all, the number of fonts for which
that backend is needed is quite small, basically bitmapped fonts.

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bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1' Eli Zaretskii <eliz@gnu.org> - 2020-09-03 21:24 +0300

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