From: Angus Dorbie (dorbie++at++sgi.com)
Date: 04/05/2000 14:40:27
"Joukakelian, Zaven" wrote:
>
> Hello,
> I would like to know the impact on the performance when we overload the
> Texture memory in a Scene. For instance, in Perfly when the whole scene is
> loaded,
> it indicates a 104,88 % of total texture usage.
It very much depends. This is an approximate indicator based on cpu
based estimates using internal formats & image sizes.
Also it's really the texture used in the visible scene that's the more
significant performance indicator, other textures can and will be paged
out by the memory manager. You'll see some recurring glitches then
things will smooth out if the texture memory manager is behaving.
The worst scenario is when you oversubscribe in the visible scene. You
can end up round robin paging through your textures because of the
priority based TRAM management and paging all textures in the scene
every frame. This is going to slow you to a crawl. How slow depends on
tram and platform.
Cheers,Angus.
-- For Performer+OpenGL tutorials http://www.dorbie.com/"In the middle of difficulty lies opportunity." --Albert Einstein
This archive was generated by hypermail 2b29 : Wed Apr 05 2000 - 14:40:37 PDT