Re: Visual Workstation

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Angus Dorbie (dorbie++at++sgi.com)
Thu, 07 Jan 1999 13:05:46 -0800

Alejandro Saez wrote:
>
> Thers is something I've been wondering about, and since I've haven't seen the
> Vega NT wrapper and it is somehow related to this... well here it goes:
>
> How does NT handle the real-time aspects of demanding visual simulations? I
> mean I've used NT and Win95 and the OS's scheduling is pretty lame, even for
> productivity applications. Open a file, and there goes interactivity...so
> although this issue has to do with the OS rather than Performer or some other
> API, it still puzzles me how can such an OS do real-time sim. This is not a
> critic, it is a question.
>

It doesn't. Even Microsofts claims of Real-Time for pending Windows CE
releases (for embedded systems) are largely greeted with ultra
skepticism in those markets. It's not really relevant to talk about what
happens when you read a big file from disk on a single CPU desktop.

The idea will be that you can do some form of 'soft' real-time on
windows, ie it get's you there most of the time but don't bet your life
on it. Stuff like interrupt response times and jitter in really fast or
accurate timing loops will ofcourse blow chunks. Heck there isn't even
processor lockdown there. The windows cupboard is pretty bare when it
comes to Real-Time. That might improve but you'll want to look at 3rd
party tools for NT.

Cheers,Angus.

-- 
"Only the mediocre are always at their best." -- Jean Giraudoux


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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