Re: gdmgreeter CPU usage

["Padraig O'Briain" <Padraig Obriain Sun COM>]

FcFontSort is called 12 times during gdmgreeter startup, with a total
cost of 205 ms of CPU.

As this occurs during the boot phase I suspect that the elapsed time is
even longer.

I have bootchart that show that gdmgreeter takes about 5 seconds to
startup when booting. About 860 ms of that is CPU time.

Padraig

On Tue, 2006-01-10 at 12:34 -0600, Federico Mena Quintero wrote:
> On Tue, 2006-01-10 at 15:18 +0000, Padraig O'Briain wrote:
> > I have dug deeper and found that indeed FcFontSort seems to be the
> > culprit. This function is called twice for each call to
> > pango_layout_line_get_extents and each call costs about 17 ms.
> > 
> > This accounts for most of the time.
> > 
> > I have also looked at greeter_session_init which is costing me 150 ms.
> > 17 ms is due FcFontSort and 120 ms is due to FcInit.
> 
> FcInit may get better with the newer fontconfigs.  I haven't really
> tested them to know what kind of an improvement they can make.
> 
> Things like GtkFontSelection *do* need to be made faster for e.g. CJK
> locales (bug #319483).  There, FcFontSort is indeed a problem.
> 
> But... you have very small timings there :)  Shaving off 2*17 ms from
> GDM's startup time?  How long does it take to start up?
> 
>   Federico
> 
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