[udig-devel] Re: performance when creating polygons

[Jesse Eichar]

There are a few things here:

1.  Each time you move the mouse the entire viewport is redrawn to a  
background buffer then draw to the screen.  This takes a lot of CPU.   
I've had plans on allowing just parts of the viewport to be updated  
but it is a complicated procedure to calculate what needs to be  
updated.  Each Draw command is supposed to have a area that needs to  
be refreshed for them.  I'm not sure all of them are there.

That is probably the biggest issue right now.  I have never had time  
to finish work on the Edit tools performance tuning is one of the  
things I really want to get at.  Hopefully I'll find some time soon.

Jesse

On Sep 6, 2007, at 1:17 AM, tony.roth at GMX.de wrote:

> Hi Jesse,
> a second mail not via the list due to file attachement.
>
> The screenshot shows the performance of my computer (pentium 4 HT  
> with 3.4GHz and 2GB RAM) while creating a polygon.
>
> I added red and yellow rectangles to the cpu statistics.
>
> The red one contains the time I draw the last polygon (the one with  
> 9 vertices) on the map. I did it quite slowly and it lasts about 18  
> seconds.
> The yellow ones contain time where I just moved the mouse over the  
> map. The background noise (all other running processes where more  
> or less sleeping) is not more than 2% load, so all this load is  
> just produced by udig.
>
> I won't nudge about that but I think it's quite a lot load which is  
> produced. The pentium 4 is not the newest one but it's a quite fast  
> computer.
>
> When creating a new polygon each vertex creation is symbolized with  
> a little animation where a circle shrinks to the square which  
> symbolizes the vertex. This animation is sometimes stuttering and  
> not fluid due to the load.
>
> tony roth
> <performance_rc11.png>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.refractions.net/pipermail/udig-devel/attachments/20070906/eb57e2e6/attachment.html