Scene graph performance
Dr. Michael Paus
mp at jugs.org
Thu Jul 21 10:07:20 UTC 2016
I have written various tests like the ones you use in FXMark and I have
obtained similar results. I have even tried to substitute 2D shapes by
using 3D MeshViews in the hope that this would give better performance
but the results were not that good. Of course all this depends on the
specific test case but in general I see that a JavaFX application which
makes heavy use of graphics animations is completely CPU-bounded.
The maximum performance is reached when one CPU/Core is at 100%.
The performance of your graphics hardware seems to be almost irrelevant.
I could for example run four instances of the same test with almost the
same performance at the same time. In this case all 4 cores of my machine
were at 100%. This proves that the graphics hardware is not the limiting
factor. My machine is a MacBook Pro with Retina graphics and a dedicated
NVidia graphics card which is already a couple of years old and certainly
not playing in the same league as your high-power card.
I myself have not yet found a way to really speed up the graphics
and I am a little bit frustrated because of that. But it is not only the
graphic performance which is a problem. There are also a lot of other
into which you can stumble and which can bring your animations to a halt
or even crash your system. Zooming for example is one of these issues.
I would like to have some exchange on these issues and how to best address
them but my impression so far is that there are only very view people
in that. (I hope someone can prove me wrong on this :-)
Am 20.07.16 um 04:14 schrieb Felix Bembrick:
> Having written and tested FXMark on various platforms and devices, one
> thing has really struck me as quite "odd".
> I started work on FXMark as a kind of side project a while ago and, at the
> time, my machine was powerful but not "super powerful".
> So when I purchased a new machine with just about the highest specs
> available including 2 x Xeon CPUs and (especially) 4 x NVIDIA GTX Titan X
> GPUs in SLI mode, I was naturally expecting to see significant performance
> improvements when I ran FXMark on this machine.
> But to my surprise, and disappointment, the scene graph animations ran
> almost NO faster whatsoever!
> So then I decided to try FXMark on my wife's entry-level Dell i5 PC with a
> rudimentary (single) GPU and, guess what - almost the same level of
> performance (i.e. FPS and smoothness etc.) was achieved on this
> considerably less powerful machine (in terms of both CPU and GPU).
> So, it seems there is some kind of "performance wall" that limits the
> rendering speed of the scene graph (and this is with full speed animations
> What is the nature of this "wall"? Is it simply that the rendering pipeline
> is not making efficient use of the GPU? Is too much being done on the CPU?
> Whatever the cause, I really think it needs to be addressed.
> If I can't get better performance out of a machine that scores in the top
> 0.01% of all machine in the world in the 3DMark Index than an entry level
> PC, isn't this a MAJOR issue for JavaFX?
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