Re: gtk_label_set_text severe performance issue

[James Johnson <johnsjam comcast net>]

Hello,

	I had the same problem, only I had to update 2048 sets  of numbers  at 
 around 30 times/second.  It took over 5 seconds to do one update and I 
ended up going back to the primitives for drawing characters from gdk.  
This issue has been brought up by a lot of people actually, it seems 
that it is a problem with the time it takes for pango to render a block 
of text.  The only thing I can suggest is to only update the text 
number if it has actually changed.....Pango font rendering is extremely 
slow and a CPU hog for displaying real time data. Other than that, 
maybe join the pango team and help to get this changed? Someone else 
might be able to shed more light on this subject than me.

Jimmy

On Nov 9, 2004, at 3:39 PM, Dave Andruczyk wrote:

>   I have an application that updates a bunch of GTK_LABEL's used for 
> status
> information. (about 15 labels at a max refresh of about 30 times per 
> second)
>
> When updating only about 5 of the 15 labels at 30 times/sec CPU usage 
> stays at
> a steady 35% (Athlon 1.2Ghz) updating all at 3o times/sec nearly maxes 
> the CPU
> out.  Commenting out the gtk_label_set_text() calls keeps cpu usage at 
> 0%.
> What gives?
>
> The labels are being updated with a 3 to 5 charactor number (like 
> 125.5), so
> it's not like I'm rerendering a large block of text...
>
> This is with GTK+-2.4.9 on gentoo linux.  (I've seen this problem since
> GTK+-2.0)
>
>
>
>
> =====
> Dave J. Andruczyk
>
>
>                 
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