OK, thanks Robert. So I do a couple of frames until values stabilize. The shown average is what I finally need.
- Werner - Am 17.07.2018 um 12:12 schrieb Robert Osfield: > Hi Werner, > > The values are averaged as otherwise they'd jump around so much that > they would be un-readable blur. > > The exact values are all collated in the the various osg::Stats > objects, so perhaps you can have a look at these. > > As a general note, OpenGL timing data is not deterministic, this is > partly down to the OpenGL FIFO blocking at different points in the > frame, or sometimes the OS and the driver interacting in different > ways each frame. This effect gets worse the more overloaded your > system is. > > This means you need to take the stats as hint to what is going on, but > it's not hard fast, to really understand you need to be aware of how > various things interact. > > Robert. > > Robert. > On Tue, 17 Jul 2018 at 10:43, Werner Modenbach > <werner.modenb...@texion.eu> wrote: >> Hi all, >> >> I'm trying to optimize the display speed of my application by testing >> various techniques. >> >> In order to do exact measures I implemented a mechanism where I can >> trigger single frame() calls from my keyboard. >> >> Curiously the GPU times shown by the stats handler are always drifting >> somehow over significant ranges >> before getting stable. Does anybody know if there is some averaging over >> a couple of frames or is there any other effect >> I don't see at the moment? Or is this a kind of caching effect? >> >> It's difficult to judge the effects of techniques under those >> circumstances if I don't have an idea what is causing the drifts. >> >> Thanks for any hints. >> >> - Werner - >> >> >> _______________________________________________ >> osg-users mailing list >> osg-users@lists.openscenegraph.org >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
