<div dir="ltr">The biggest issue here is that two windows (without vsync) now h<i>eavily affects each other</i>, which they did not in OSG 3.5.1. That is certainly a big difference between the two versions.<div>The performance difference remains after writing a osgt file in 3.5.1<br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Jan 8, 2020 at 5:04 PM Robert Osfield <<a href="mailto:robert.osfield@gmail.com">robert.osfield@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi Anders,</div><div><br></div><div>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.</div><div><br></div><div>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.</div><div><br></div><div>I would check other OS's to see see if the differences apply there too.</div><div><br></div><div>Robert.<br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 8 Jan 2020 at 15:56, Anders Backman <<a href="mailto:andersb@cs.umu.se" target="_blank">andersb@cs.umu.se</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi all.<div><br></div><div>Windows 10.</div><div>NVida GeForce RTX 2080.</div><div><br></div><div><br></div><div>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).</div><div><br></div><div>1. I use <b>SingleThreaded mode</b></div><div>2. I use <b>m_viewer->setReleaseContextAtEndOfFrameHint(false);</b></div><div>3. I use <b>window->setSyncToVBlank(false);</b></div><div><br></div><div>The above attributes are quite tightly connected to my issues.</div><div><br></div><div>But first, running osgViewer with those settings I get using a simple obj file. Details not important, see below.</div><div>When loading a simple .obj file (couple of hundred triangles) into osgViewer:</div><div><br></div><div><b>> osgViewer --window 0 0 1280 720</b></div><div><br></div><div>3.5.1: 1900 fps. Draw 0.08ms</div><div>3.6.4: 2500 fps Draw 0.05ms<br clear="all"><div><div><br></div><div>Now this already show something different between the two versions, although perhaps not so relevant.</div><div><br></div><div><img src="cid:ii_k550ypo20" alt="image.png" width="412" height="129"><br></div></div><div><br></div><div>But if I start two instances of the viewer at the same time, I get a HUGE difference.<br><br></div><div>3.5.1: Two windows, both run in ~2000fps, smoothly.</div><div>3.6.4: Two windows, fps varies between 80-1200fps. Animations are not smooth at all (when spinning the model).</div><div><br></div><div>I also have a few more issues, but I have not been able to pin them down yet:</div><div><br></div><div>I get small objects culled at a certain distance although they where not culled in previous version.</div><div>Might be some change in how bounding volume update is handled in 3.6.4, will know more later.</div><div><br></div><div>Anyone else noticed the performance drop/change in 3.6.4?</div><div><br></div><div>/Anders</div><div><br></div><div><br></div><div><br></div>-- <br><div dir="ltr">__________________________________________<br>Anders Backman, HPC2N<br>90187 Umeå University, Sweden<br><a href="mailto:anders@cs.umu.se" target="_blank">anders@cs.umu.se</a> <a href="http://www.hpc2n.umu.se/" target="_blank">http://www.hpc2n.umu.se</a><br>Cell: +46-70-392 64 67</div></div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature">__________________________________________<br>Anders Backman, HPC2N<br>90187 Umeå University, Sweden<br><a href="mailto:anders@cs.umu.se" target="_blank">anders@cs.umu.se</a> <a href="http://www.hpc2n.umu.se" target="_blank">http://www.hpc2n.umu.se</a><br>Cell: +46-70-392 64 67</div>