[Bug 1590804] Re: fontconfig initialization spends most of its time parsing XML configuration files in /etc/fonts/conf.d/

[Gunnar Hjalmarsson]

On 2016-06-14 20:41, Florian Boucault wrote:
> The output of strace shows that fontconfig opens those file during
> every QML application startup.
> 
> A solution to this would be to introduce a caching system: after 
> fontconfig opens and parses those files the first time it could 
> serialize the result to disk for subsequent starts.

>From "man fc-cache":

<quote>
fc-cache scans the font directories on the system and builds font information cache files for applications using fontconfig for their font handling.

If directory arguments are not given, fc-cache uses each directory in the current font configuration. Each directory is scanned for font files readable by FreeType. A cache is created which contains properties of each font and the associated filename. This cache is used to speed up application startup when using the fontconfig library.
</quote>

Maybe there is a simple solution available.

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https://bugs.launchpad.net/bugs/1590804

Title:
  fontconfig initialization spends most of its time parsing XML
  configuration files in /etc/fonts/conf.d/

Status in Canonical System Image:
  New
Status in fontconfig package in Ubuntu:
  New

Bug description:
  While profiling the startup of QML apps on the BQ E4.5 phone (armhf) I noticed that a significant amount of time (around 35ms) was spent solely on parsing the XML configuration files in /etc/fonts/conf.d/ 
  There seems to be around 40 files on Ubuntu Phone in that directory.

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