The case studies on the Sun site on Hotspot also suggest that
intially it will not show any improvement but as it continues to run
and Hotspot gathers profile information and optimizes according to
it, you see marked increases in performance. So anybody who just
loads up a Java app and runs a few quick tests should not expect
anything impressive.
But the one place I would hope for immediate improvements for all
Java3d apps is the problem with screen pauses during garbage
collection. Supposedly Hotspot's garbage collection algorithm
should alleviate this situation.
Does the floating point bug mentioned by Dan Kirkpatrick affect
this area enough to invalidante any tests of this on NT? Was the
GC pausing an issue on Solaris too? Is anyone testing Hotspot
who had a significant pausing problem who can report on this?
> It seems SUN hyped HotSpot a bit too much. Bad for them. People are
> posting similar experiences on Swing list.
>
> But, two things I would like to add here:
>
> 1. Most of the work (including rendering) in Java3D gets done in native
> code, opengl and a bit in Java3D.dll. HotSpot cannot touch those portions,
> so it's wrong to expect HotSpot to improve frame rates or Java3D
> performance in general. My comparision of Java3D OpenGL/C++ yielded
> similar apparent performance on some very large parts. And that was,
> without hotspot, and in beta releases of Java2 and Java3D. I believe that
> if properly used and optimized (minimize Shape3D's and all) Java3D should
> be almost as fast as OpenGL.
>
> 2. SUN claims that real benefits of HotSpot are seen for Server side
> applications, large code which runs for a long time. See:
> http://java.sun.com/products/hotspot/launch/Q+A.html
>
>
>
> Rajesh Gupta
>
> ----- Original Message -----
> From: Stephen E. Schweibinz <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Monday, May 03, 1999 7:45 PM
> Subject: Re: [java3d] Hotspot and Java3D
>
>
> >
> > >Guillaume Bedard wrote:
> > >>
> > >> Hi all!
> > >>
> > >> I have tried the new HotSpot VM with our application which makes use
> > >> of Java3D, and for an unknown reason, it is noticeably slower than
> > >> the classic VM in all situations. I must admit that I was hoping a
> > >> totally different result.
> > >>
> > >> If someone has more details or similar results, please answer.
> > >
> > >I noticed this too, when I was using the pre-release version. I didn't
> > >want to say anything because you couldn't talk about performance in
> > >public, but I guess that's changed now.
> > >
> > >Maybe a member of the J3D team can comment on this ? I'm sure they have
> > >tested Hotspot and noticed it ...
> > >
> >
> >
> > I found similar results. HotSpot didn't seem to
> > speed up Java3D. Here are my scores on the tornado
> > labs benchmark, before and after HotSpot.
> >
> > Steve Schweibinz
> >
> >
> > CPU Dual PII OverDrive
> > Speed 333 x 2
> > OS Win NT SP3
> > Video STB Velocity 4400, PCI, nVidia Riva TNT (16Mb), v. 1.01
> > RAM 320 MB
> >
> > ------------------------------------------------------------------
> > 512x512 Resolution
> >
> > FPS without HotSpot FPS with HotSpot
> >
> > Test 1 35.97 32.66
> > Test 2 177.93 177.94
> > Test 3 31.68 31.68
> >
> > ------------------------------------------------------------------
> > 256x256 Resolution
> >
> > FPS without HotSpot FPS with HotSpot
> >
> > Test 1 38.08 34.39
> > Test 2 188.67 188.68
> > Test 3 32.01 31.07
> >
> >
> > /*******************************************************
> >
> > Stephen E. Schweibinz
> > Planning Support Systems Group, MCP candidate, MIT
> > (617) 679-0360
> > [EMAIL PROTECTED]
> > http://www.vcp.com
> >
> > *******************************************************/
> > ===================================================================== To
> > subscribe/unsubscribe, send mail to [EMAIL PROTECTED] Java 3D
> > Home Page: http://java.sun.com/products/java-media/3D/
> >
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