Re: [gl4java-usergroup] Re: PERFORMANCE

[Sven G. <sgo...@ja...>]

Artiste on the Web wrote:
> 
> Stuart Fischer wrote:
> > > I have discover that the multi-threading can slow down the rendering !
> > > Java may wait before really doing the rendering in the rendering thread,
> > > and may coalesce rendering. Each frame in my game, i call a rendering,
> > > but java coalesce them and i have only 1 real rendering for about 30-60
> > > frames...
> > Maybe I don't understand your problem, but I don't know if it is related to
> > multithreading.
> >
> > Are you calling repaint() once per frame in your game loop and calling
> > sDisplay() in your paint() (or update()) method?
> >
> > If so, Java WILL coalesce rendering.
> >
> > If this describes your situation, call sDisplay() instead of repaint() in
> > your game loop.
> 
> It is OK ! Thanks !
> 
> My FPS was about 7 and now it has risen to more than 100 !!!
> 

Well, you can check this bahavior in all the
GLAnimCanvas derived demos !

E.g.: The overworked gears demos in demos/MiscDemos of the upcoming 
GL4Java Release 2.4.1 (this night :-) I do upload it),
does have a command line attribute "-perftest" -> "java gears
-perftest",
where the setUseFpsSleep and setUseRepaint are called to set 'em to
false.

In this case, the AWT-renderer thread is NOT used for animation.
The reason for the slow down is the AWT renderer thread itself,
because if using repaint everything goes over this thread -> slow !

The sleep call, which is used to set the thread into a waiting state,
slows down the fps rate, because the threading block mechanism !

But be sure, the responsiveness of the application can be worse,
because the GL render thread may block other threads 
and can steal all the resources of the machine !
The minimal prerequisites are, that the JVM implements native threading
well
(the most uptodate JVM's) and that the OS supports mutli-threading well
- also 
(may be some problems with Win9X ?) !

I will notify ya all about the new version today !

Some more bugfixes I have todo ...

Yours, Sven

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