RE: High X server CPU usage when drawing

----- Original Message -----
From: Rafael E. Herrera <[email protected]>
To: <[email protected]>
Sent: Monday, December 09, 2002 5:31 PM
Subject: [Xpert]High X server CPU usage when drawing


> Hello,
>
> I'm developing an application using the motif toolkit to display line
> traces in the manner of a multichannel osciloscope. This is a linux
> platform.
>
> The window draws a number of horizontal traces obtained from a data
> source. When we started using the xinerama extension or very large
> resolutions (> 1280x1024). We started observing an undesirable behavior:
>
> The application, when is resized, re-creates the pixmaps where the data
> is drawn. The old ones are freed and new ones are created according to
> the new size of the window. Then, the program continues operating by
> receiving new data periodically and drawing them.


How you handle Ecpose Event... I was done similar task in Athena Widget set
and via Xlib functions XDrawLine XDrawArc... I have 2 dynamicaly reziable
arrays of structures(one for XDrawLine parameters and the other for XDrawArc
parameters) and in Expose handler I just read clear graphical context  and
run 2 cycles for displaying arcs and lines...

Window manager and as wel my application runs with priority -20, load is
permanently about 70% for X (but I run another one task with priority -20).
Reactions for keypress are delayed <2s on a Celeron @333Mhz based PC...


High load is normal for any WIMP system...


Bye
Peter