[sacha@myxomop.com: Re: XCreateFontSet called for each X window emacs frame is heavy]

[Richard Stallman <rms@gnu.org>]

Would someone please DTRT and ack?  I have enclosed two messages.
Handa, this is in your area.

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From: Alexander Kotelnikov <sacha@myxomop.com>
Date: Sat, 30 Jun 2007 16:39:36 +0400
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Subject: XCreateFontSet called for each X window emacs frame is heavy
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Hello.

I think it is years now since I had noticed that every new emacs frame
either first or any subsequent makes all my computers feel bad. X
display stands still, cursor moves, but does not respond to clicks,
focus switches slowly. This continues of a split second, but it
hurts, I assure you. I do not know any other program, that causes
such problems.

Today I performed the following steps:
1. Checked that this feature is reproducible with emacs-snapshot from
   Debian/unstable.
2. Got emacs21 sources, built them and started emacs in debugger.

Here is the place the trouble occurs:
Breakpoint 15, create_frame_xic (f=0x849a8c0) at xfns.c:3348
3348    {
(gdb) cont
Continuing.

Breakpoint 17, xic_create_xfontset (f=0x849a8c0, 
    base_fontname=0xbfdbc270 "-*-*-medium-r-normal--13-*-*-*-*-*-*-*") at xfns.c:3310
3310      xfs = XCreateFontSet (FRAME_X_DISPLAY (f),

I suppose really a lot of fonts match this pattern.

Let's think, if something can be done to improve the situation.

Thank you for your attention

backtrace:
#0  xic_create_xfontset (f=<value optimized out>, base_fontname=<value optimized out>)
    at xfns.c:3318
#1  0x080c876a in create_frame_xic (f=0x849a8c0) at xfns.c:3408
#2  0x080ca834 in x_window (f=0x849a8c0) at xfns.c:3842
#3  0x080cee1a in Fx_create_frame (parms=1480533300) at xfns.c:4433
#4  0x08135684 in Ffuncall (nargs=2, args=0xbfdbc488) at eval.c:2659
#5  0x08161790 in Fbyte_code (bytestr=941887248, vector=1210322784, maxdepth=5)
    at bytecode.c:716
#6  0x081351c4 in funcall_lambda (fun=1210322660, nargs=1, arg_vector=0xbfdbc5b4)
    at eval.c:2851
#7  0x081355a6 in Ffuncall (nargs=2, args=0xbfdbc5b0) at eval.c:2716
#8  0x08161790 in Fbyte_code (bytestr=941841804, vector=1210277296, maxdepth=3)
    at bytecode.c:716
#9  0x081351c4 in funcall_lambda (fun=1210277212, nargs=1, arg_vector=0xbfdbc6d4)
    at eval.c:2851
#10 0x081355a6 in Ffuncall (nargs=2, args=0xbfdbc6d0) at eval.c:2716
#11 0x08161790 in Fbyte_code (bytestr=941838140, vector=1210273700, maxdepth=4)
    at bytecode.c:716
#12 0x081351c4 in funcall_lambda (fun=1210273568, nargs=0, arg_vector=0xbfdbc7f4)
    at eval.c:2851
#13 0x081355a6 in Ffuncall (nargs=1, args=0xbfdbc7f0) at eval.c:2716
#14 0x08161790 in Fbyte_code (bytestr=941992740, vector=1210429452, maxdepth=5)
    at bytecode.c:716
#15 0x081351c4 in funcall_lambda (fun=1210428172, nargs=0, arg_vector=0xbfdbc924)
    at eval.c:2851
#16 0x081355a6 in Ffuncall (nargs=1, args=0xbfdbc920) at eval.c:2716
#17 0x08161790 in Fbyte_code (bytestr=941988804, vector=1210424404, maxdepth=5)
    at bytecode.c:716
#18 0x081351c4 in funcall_lambda (fun=1210424236, nargs=0, arg_vector=0xbfdbc9f0)
    at eval.c:2851
#19 0x081353c4 in apply_lambda (fun=1210424236, args=405279788, eval_flag=1)
    at eval.c:2770
#20 0x0813469a in Feval (form=1480204196) at eval.c:2071
#21 0x080dd753 in top_level_2 () at keyboard.c:1254
#22 0x081341bf in internal_condition_case (bfun=0x80dd740 <top_level_2>, 
    handlers=405376132, hfun=0x80dfdc0 <cmd_error>) at eval.c:1267
#23 0x080df8f1 in top_level_1 () at keyboard.c:1262
#24 0x08134274 in internal_catch (tag=405337716, func=0x80df8c0 <top_level_1>, 
    arg=405279788) at eval.c:1030
#25 0x080dfa8a in command_loop () at keyboard.c:1223
#26 0x080dfb5b in recursive_edit_1 () at keyboard.c:950
#27 0x080dfc83 in Frecursive_edit () at keyboard.c:1006
#28 0x080d7f02 in main (argc=1, argv=0xbfdbd144, envp=0x0) at emacs.c:1547

-- 
Alexander Kotelnikov
Saint-Petersburg, Russia


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To: rms@gnu.org
Subject: Re: XCreateFontSet called for each X window emacs frame is heavy
From: Alexander Kotelnikov <sacha@myxomop.com>
Organization: Global disintoxication
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Date: Sun, 01 Jul 2007 14:50:19 +0400
In-Reply-To: <E1I4nKZ-0002jd-0M@fencepost.gnu.org> (Richard Stallman's
 message of "Sat, 30 Jun 2007 20:30:23 -0400")
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Still there. But it appears only in UTF-8 locales (I use ru_RU, but
checked with fr_FR and en_US). The problem is the last XCreateFontSet
in enclosed gdb log.

>>>>> On Sat, 30 Jun 2007 20:30:23 -0400
>>>>> "RS" == Richard Stallman <rms@gnu.org> wrote:
RS> 
RS> Would you like to try the latest Emacs release, 22.1,
RS> and see if it has the same problem?

14:34 pts/18 sacha@benington:/tmp/emacs-22.1 8> gdb src/emacs
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This GDB was configured as "i486-linux-gnu"...Using host libthread_db
library "/lib/tls/li
bthread_db.so.1".

(gdb) break create_frame_xic
Breakpoint 1 at 0x80cf239: file xfns.c, line 2257.
(gdb) break xic_create_xfontset
Breakpoint 2 at 0x80cef8b: file xfns.c, line 2133.
(gdb) cont
The program is not being run.
(gdb) start
Breakpoint 3 at 0x80e6487: file emacs.c, line 822.
Starting program: /tmp/emacs-22.1/src/emacs 
[Thread debugging using libthread_db enabled]
[New Thread -1212270912 (LWP 30923)]
[Switching to Thread -1212270912 (LWP 30923)]
main (argc=1, argv=0xbfdb2154) at emacs.c:822
822       stack_base = &dummy;
(gdb) cont
Continuing.

Breakpoint 1, create_frame_xic (f=0x85c3fe8) at xfns.c:2257
2257    {
(gdb) cont
Continuing.

Breakpoint 2, xic_create_xfontset (f=0x85c3fe8, 
    base_fontname=0x8591aa4 "-monotype-courier
    new-medium-r-normal--13-92-100-100-m-80-ado
be-standard") at xfns.c:2133
2133      if (!base_fontname)
(gdb) next
2126    {
(gdb) 
2128      char **missing_list = NULL;
(gdb) 
2133      if (!base_fontname)
(gdb) 
2137      FOR_EACH_FRAME (rest, frame)
(gdb) 
2139          struct frame *cf = XFRAME (frame);
(gdb) 
2140          if (cf != f && FRAME_LIVE_P (f) && FRAME_X_P (cf)
(gdb) 
2152          char *fontsetname = xic_create_fontsetname
    (base_fontname, False);
(gdb) 
2155          xfs = XCreateFontSet (FRAME_X_DISPLAY (f),
(gdb) 
2152          char *fontsetname = xic_create_fontsetname
    (base_fontname, False);
(gdb) 
2155          xfs = XCreateFontSet (FRAME_X_DISPLAY (f),
(gdb) 

2158          if (missing_list)
(gdb) 
2160          if (! xfs)
(gdb) p fontsetname
$1 = 0x85d0c80 "-monotype-courier
new-medium-r-normal-*-13-92-100-100-m-80-adobe-standard,
- -monotype-courier
new-medium-r-normal-*-13-*-*-*-*-*-*-*,-*-*-medium-r-normal-*-13-*-*-*-*
- -*-*-*,-*-*-*-*-*-*-13-*-*-*-*-*-*-*"
(gdb) 
- -- 
Alexander Kotelnikov
Saint-Petersburg, Russia
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