<div dir="ltr"><div>Thanks for the tests, just wanted to add small note about time comparisons. You really need to do much longer renders, which takes several minutes at least.</div><div><br></div><div>28.07 vs. 28.25 doesn't mean all the renderers are 1% slower, it might be just a time constant, which needs to start the bigger kernel, which you wouldn't really notice if your render time is some minutes at least. Also such a small time differences might be caused by factors like different timing of scheduling blender in the OS task scheduler caused by interference with other running processes and so.</div>
<div><div><br></div></div><div>That would make timing more accurate.</div><div><br></div><div>Textures might do rendering slower yes, could be optimized perhaps on GPU, but for me doesn't seem to be a stopper for enabling volumes on GPU.</div>
<div><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Aug 22, 2014 at 8:06 PM, David Fenner <span dir="ltr"><<a href="mailto:d4vidfenner@gmail.com" target="_blank">d4vidfenner@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Ok, done some further testing and the thing that really kills gpu performance are textures in volumes. With no textures gtx Titan is about 3 times faster than a 6-core overclocked ivy bridge, even with volume scatter and lots of bounces. However when textures are introduced, amazingly cpu gets about 1.5 times faster than gpu. That means that texturing volumes cripples gpu performance by about 4 times. Still, non textured volumes are actually flying on the gpu (even though its only distance sampling) and are totally worth it for now.<div>
<br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-08-22 9:57 GMT-04:00 David Fenner <span dir="ltr"><<a href="mailto:d4vidfenner@gmail.com" target="_blank">d4vidfenner@gmail.com</a>></span>:<div>
<div class="h5"><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">On GTX titan, mike pan test:<div><br></div><div><div>2.71 official 27.62</div><div>vainilla cuda 6.5 28.07</div>
<div>volume cuda 6.5 28.25</div><div><br></div><div><br></div>
<div>Notes: Was testing volumes and with a simple world volume and a lamp now it's actually much faster than cpu (before gpu was crazy slow). Haven't tested it with more complex scenes. I noticed though that in gpu volume gets always sampled as "distance" sampling, no matter the setting. Cpu however respects the other settings (equiangular, etc). In distance gpu much faster and its also faster when bounces are introduced, something that in older builds really killed gpu performance.</div>
<div><br></div><div><br></div><div><br></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">2014-08-22 8:48 GMT-04:00 Tungerz <span dir="ltr"><<a href="mailto:tungerz@gmail.com" target="_blank">tungerz@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div><div dir="ltr"><div>Probably nothing,</div><div>I was upgrading my Cuda Toolkit to 6.5 (From 6.0)</div>
<div>My Norton antivirus picked up a virus from file nppc32_65.dll = Suspicious.Cloud.7.F</div>
<div>Anyone else on windows had this?</div>
<div><br></div><div>Great results, looks like a small price to pay for gpu volume and scatter.</div><div>Worth ever bit of it :)</div><div><br></div><div>Cheers,</div><div> ~Tung</div></div>
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