[osg-users] Performance drop in 3.6.4 vs 3.5.1

[Robert Osfield]

Hi Anders,

Try exporting the .obj file to .osgb or .osgt from 3.5.1 and then compare
the performance between 3.5.1 and 3.6.4.  This would check whether the .obj
loader is a variable.

As a general comment, frame rates many times higher than vsync should be
treated careful, the frame time can be so small that small overheads
elsewhere can lead to large % changes that appear significant but once you
start using normal workloads these small differences no longer have an
outsized % difference.

I would check other OS's to see see if the differences apply there too.

Robert.



On Wed, 8 Jan 2020 at 15:56, Anders Backman <andersb at cs.umu.se> wrote:

> Hi all.
>
> Windows 10.
> NVida GeForce RTX 2080.
>
>
> I recently switched to 3.6.4 from 3.5.1 and noticed a huge drop in
> performance, especially when running with two separate windows (two
> applications).
>
> 1. I use *SingleThreaded mode*
> 2. I use  *m_viewer->setReleaseContextAtEndOfFrameHint(false);*
> 3.  I use *window->setSyncToVBlank(false);*
>
> The above attributes are quite tightly connected to my issues.
>
> But first, running osgViewer with those settings I get using a simple obj
> file. Details not important, see below.
> When loading a simple .obj file (couple of hundred triangles) into
> osgViewer:
>
> *> osgViewer --window 0 0 1280 720*
>
> 3.5.1: 1900 fps. Draw 0.08ms
> 3.6.4: 2500 fps Draw 0.05ms
>
> Now this already show something different between the two versions,
> although perhaps not so relevant.
>
> [image: image.png]
>
> But if I start two instances of the viewer at the same time, I get a HUGE
> difference.
>
> 3.5.1: Two windows, both run in ~2000fps, smoothly.
> 3.6.4: Two windows, fps varies between 80-1200fps. Animations are not
> smooth at all (when spinning the model).
>
> I also have a few more issues, but I have not been able to pin them down
> yet:
>
> I get small objects culled at a certain distance although they where not
> culled in previous version.
> Might be some change in how bounding volume update is handled in 3.6.4,
> will know more later.
>
> Anyone else noticed the performance drop/change in 3.6.4?
>
> /Anders
>
>
>
> --
> __________________________________________
> Anders Backman, HPC2N
> 90187 Umeå University, Sweden
> anders at cs.umu.se http://www.hpc2n.umu.se
> Cell: +46-70-392 64 67
> _______________________________________________
> osg-users mailing list
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>
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