[cairo] 1.1.6 to 1.2.0 performance

[David Turner]

John Ellson a écrit :
> David Turner wrote:
>> Hello John,
>>
>>
>>> I suspect the problem is fontconfig.
>>>
>>> I'm a graphviz developer, and dot, which is a command line utility 
>>> from graphviz, uses: pango+cairo+fontconfig+freetype
>>> Every time I run dot it opens 940 files in /var/cache fontconfig  
>>> just to resolve "Times-Roman" !
>>>
>>>    $ strace dot hello.dot 2>&1 | grep open | grep 
>>> /var/cache/fontconfig | wc
>>>        940    3760   79900
>>>
>>> Its not a problem specific to graphviz, or even cairo.  The 
>>> fontconfig utility fc-match has the same problem:
>>>
>>>    $ strace /usr/bin/fc-match serif 2>&1 | grep open | grep 
>>> /var/cache/fontconfig | wc
>>>        940    3760   79900
>>>
>>> Perhaps this doesn't matter much for a gui appplication, but its a 
>>> major problem for command line, or web-server applications.
>>>
>> A recent version of fontconfig should be able to use a global cache, 
>> instead of having to re-open all font files
>> on startup. Moreover, FreeType 2.2.1 and later contain several 
>> speed-ups that might affect performance
>> positively when opening a lot of font files.
>>
>> it'd be interesting to know which versions of these libraries you're 
>> using.
>
> I'm using the latest available version on Fedora Development:
>    fontconfig-2.3.95-4
>    freetype-2.2.1-2
>
this is quite strange, please forward this to the fontconfig mailing 
list, they must be made aware of the problem.

Hope this helps,

- David


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