[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Christoph Feck]

https://bugs.kde.org/show_bug.cgi?id=378227

Christoph Feck  changed:

   What|Removed |Added

 Resolution|--- |INVALID
 Status|UNCONFIRMED |RESOLVED

--- Comment #9 from Christoph Feck  ---
Thanks for the update; closing.

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Deepak Mittal]

https://bugs.kde.org/show_bug.cgi?id=378227

--- Comment #8 from Deepak Mittal  ---
On further investigation of strace output, and doing some grepping and
filtering I found out the stat calls were made because of .glif files in
/usr/share/fonts directory. All of these files were basically sources of
source-code-pro font (https://github.com/adobe-fonts/source-code-pro). I
deleted the entire directory of that font and that has fixed the problem. I'll
file this bug with them and recommend them to not store source glyph files in
the /usr/share/fonts.

You can close this bug. Thankyou!

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Deepak Mittal]

https://bugs.kde.org/show_bug.cgi?id=378227

--- Comment #7 from Deepak Mittal  ---
This somehow looks similar to this bug is also affecting inkscape and GIMP -
https://bugs.launchpad.net/ubuntu/+source/fontconfig/+bug/1614870

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Deepak Mittal]

https://bugs.kde.org/show_bug.cgi?id=378227

--- Comment #6 from Deepak Mittal  ---
`sudo fc-cache -sf` didn't help. It's still making 55k stat calls in the
/usr/share/fonts directory.

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Rex Dieter]

https://bugs.kde.org/show_bug.cgi?id=378227

Rex Dieter  changed:

   What|Removed |Added

 CC||rdie...@gmail.com

--- Comment #5 from Rex Dieter  ---
In contrast, for me:

% time seconds  usecs/call callserrors syscall
-- --- --- - - 
 20.560.004742   3  1678   298 stat
 11.910.002747   2  1144   480 access
 10.590.002444   3   790   657 recvmsg
  9.940.002294   2  110130 lstat
  7.840.001809   4   46433 open

For me, the only fonts that get opened are the ones actually *used* in the
dialog.

Otherwise, I also see lots of hits for stuff like:
open("/var/cache/fontconfig//711dae798b6bff4224ea2776edcb5c93-le64.cache-7",
O_RDONLY|O_CLOEXEC) = 6
which is obviously a fontconfig cache.

If I had to speculate, one possibility is your fontconfig cache either doesn't
exist or is invalidated (old?).  Maybe try running (as root):
fc-cache -sf

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Dr . Chapatin]

https://bugs.kde.org/show_bug.cgi?id=378227

Dr. Chapatin  changed:

   What|Removed |Added

 CC||yy...@gmx.com

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Deepak Mittal]

https://bugs.kde.org/show_bug.cgi?id=378227

--- Comment #4 from Deepak Mittal  ---
Someone else having the same issue here:
https://forums.opensuse.org/showthread.php/519936-Installing-new-fonts-in-Plasma-5-left-me-with-a-very-slow-system

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Deepak Mittal]

https://bugs.kde.org/show_bug.cgi?id=378227

--- Comment #3 from Deepak Mittal  ---
Also see this:
grep 'usr/share/fonts' /tmp/dolphin | grep '^stat' | wc -l
47570

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Deepak Mittal]

https://bugs.kde.org/show_bug.cgi?id=378227

--- Comment #2 from Deepak Mittal  ---
Yes pretty sure. This doesn't just happen on dialog boxes, so you may change
the "product" for this bug. This happens with every KDE application. I thought
dolphin and gwenview were generally slow, but when I moved bulk of my fonts
outside of /usr/share/fonts, everything became snappy. 

Every KDE application is parsing the fonts directory, which is making the
system unusably slow.

This is first few lines from strace -C dolphin:
% time seconds  usecs/call callserrors syscall
-- --- --- - - 
 55.310.000521   1   850   getdents
 17.520.000165   0 55772  5920 stat
  7.110.67   0 24605   127 lstat
  5.200.49   0 11790   read
  4.460.42   0  6217   close
  3.930.37   0  7943  1735 open
  3.610.34   0  6343  1654 readlinkat
  1.060.10   0 11007   fstat
  0.850.08   0  3742   359 access
  0.530.05   0  2277   getrandom
  0.420.04   0  1277   lseek
  0.000.00   0  1299   write
  0.000.00   0   802   poll
  0.000.00   0   597   mmap
  0.000.00   0   358   mprotect
  0.000.00   0   111   munmap
  0.000.00   067   brk
  0.000.00   010   rt_sigaction
  0.000.00   0 2   rt_sigprocmask
  0.000.00   054   ioctl
  0.000.00   0   453   writev
  0.000.00   015   select

Bulk of the stat calls are because of the fonts in /usr/share/fonts.

I saved the strace output in /tmp/dolphin and then ran:
grep 'usr/share/fonts' /tmp/dolphin | wc -l
   
⏎
47834

Clearly it's a big issue and it needs to be fixed.

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[kdialog] [Bug 378227] KDialog scans all fonts directory before showing dialog box making it super slow

[Christoph Feck]

https://bugs.kde.org/show_bug.cgi?id=378227

--- Comment #1 from Christoph Feck  ---
Are you sure the 5 stat calls are from /usr/share/fonts? Qt should only ask
fontconfig to parse the font database once.

What you might see are stat calls for the icon themes.

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