Re: gdmgreeter CPU usage

[Stephan Kulow <coolo kde org>]

Am Mittwoch, 11. Januar 2006 10:05 schrieb Padraig O'Briain:
> FcFontSort is called 12 times during gdmgreeter startup, with a total
> cost of 205 ms of CPU.

You must have very few fonts. Install around 1000 (fc-list | wc -l) and it 
will be 2s :)
FcFontSort has some nice square algorithm and the new fontconfig made
FcInit way cheaper with the price of FcFontSort being (a bit) more expensive.

If you want to see a little picture of firefox starting up and rendering 
fontconfig.org, look here: http://www.kdedevelopers.org/node/1654

It will be very hard for you to spot FcInit, but the 1 billion instructions 
spent in (roughly 7 if I remember correctly) calls to FcFontSort are hard to 
miss. I leave the calculation of how much time 1 billion instructions take
on your hardware to the reader [that are pentium instructions btw].

So whereever you can: avoid FcFontSort and use FcFontMatch - the returned 
FontSet is good enough for most installations and FcFontMatch is a linear 
algorithm (in >= 2.3.92).

Greetings, Stephan