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Joel Gerlach (joelgerlach)
Owner, VFX Lead, Studio229

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User Since
Jun 11 2015, 2:36 AM (227 w, 1 d)

Specializing in all that VR goodness. Website: studio-229.com

Recent Activity

May 17 2016

Joel Gerlach (joelgerlach) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

@Lee Jones (moony) I am beginning to believe there is a memory component to this as well. In all our tests here (Moony, we have the same types of results as you, showcasing a marked slowdown in 2.77 that is not present in 2.75 or 2.76 while utilizing the same drivers) I've noticed that the Memory Controller Load on the TitanX is significantly reduced while in 2.77 that is not present in other renders. So I can independently verify your results. Is it possible that GPUs which contain higher vRAM (6GB and over) are experiencing some kind of memory leak or underutilization due to some kind of RAM limit? I'm a bit out of my depth on this, clearly.

May 17 2016, 12:00 AM · BF Blender

Apr 14 2016

Joel Gerlach (joelgerlach) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

@Sergey Sharybin (sergey) awesome, I'll download it here and see how it runs on a titanx; we've got a deadline this evening for client delivery, as soon as that passes I'll give it a go on our workstations. :)

Apr 14 2016, 6:47 PM · BF Blender

Apr 12 2016

Joel Gerlach (joelgerlach) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

@Sergey Sharybin (sergey) thanks for taking the time to do this writeup! Let us know if there's anything we can help with on our end. We are using Win10 and the TitanX (and 780ti of course) so if you have custom builds or would like us to tweak our settings/drivers/etc we're more than happy to participate. Thanks for all your hard work!

Apr 12 2016, 7:11 PM · BF Blender

Apr 4 2016

Joel Gerlach (joelgerlach) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Hey everyone! I'm commenting from #T47808 which dealt with a similar issue. While running Windows 10 I was actually noticing pretty heavy differences in terms of performance capabilities between versions of Blender and not just OS versions. I'm submitting the tests I ran for #T47808 here; as you can see there's definately a large performance decrease in Maxwell based GPUs (980s, TitanX) on Windows between Blender versions. Although issue #1 centered on Cycles GPU smoke which I understand is a new feature and thus nonoptimal, it makes up only one series of tests illustrating the performance hit that newer GPUs are taking on Windows 10 and 2.77.

Apr 4 2016, 8:57 PM · BF Blender

Apr 1 2016

Joel Gerlach (joelgerlach) added a comment to T45093: Cycles: NVidia GTX 980 Ti rendering at 1/3rd speed of NVidia GTX 980 the same machine?.

Hey all. Coming in here from #T47808.

Apr 1 2016, 6:51 PM · BF Blender
Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

@Bastien Montagne (mont29) brilliant mate, thanks so much! Glad to know you guys are on it.

Apr 1 2016, 6:44 PM · Cycles, BF Blender

Mar 24 2016

Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

@Sergey Sharybin (sergey) hopefully I can chime in and explain the situation more clearly! :)

Mar 24 2016, 6:57 PM · Cycles, BF Blender

Mar 18 2016

Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Yep, looking through the thread, looks like it's the same thing. @Mike (LMProductions) may be worth you or I posting over there with information here.

Mar 18 2016, 5:42 PM · Cycles, BF Blender
Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

@Aaron Carlisle (Blendify) do you have any thoughts?

Mar 18 2016, 5:22 PM · Cycles, BF Blender

Mar 17 2016

Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Interesting. So the 980ti might be included in the cards affected as well.

Mar 17 2016, 8:55 PM · Cycles, BF Blender
Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Agreed--we did the same thing to handle the VR loads that we're undertaking since we're constantly pushing 6+GB of vRAM on the equirectangular renders. Do try it on the 980ti and let me know if that solves an issue, otherwise, devs, take a look!

Mar 17 2016, 8:15 PM · Cycles, BF Blender
Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Apologies for the additional comment: Just to verify, ran these same tests on an AMD workstation also running a TitanX (but no 780ti) and the render times were in line (though a little bit longer, cause it's AMD) with the above, so it's not isolated to just this machine but seems to be in line with people who are running the TitanX.

Mar 17 2016, 7:59 PM · Cycles, BF Blender
Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Thanks Mike!

Mar 17 2016, 7:52 PM · Cycles, BF Blender
Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Hmmm. I'm getting some interesting results. Especially when compared to the 780ti.

Mar 17 2016, 6:47 PM · Cycles, BF Blender
Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Copy that! I'll download it and give it a go.

Mar 17 2016, 5:30 PM · Cycles, BF Blender
Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Considering ours is a pretty complicated setup from a tornado scene it's probably not the best thing to send over. If you'd like, you (or I) can create a small test scene and we can compare render times on that!

Mar 17 2016, 12:10 AM · Cycles, BF Blender

Mar 16 2016

Joel Gerlach (joelgerlach) added a comment to T47808: GPU rendering taking 4x longer than CPU with smoke effects.

Just chiming in here. Have a TitanX and 780ti running Windows 10 with latest Nvidia drivers, and GPU rendering for smoke is incredibly fast compared to CPU (the Intel 3770K, an admittedly older processor). Doing some tests on a tornado scene in 360 equirectangular and it works quite well. Highly possible it's an OSX problem, as when we switched from OSX to Windows/Linux we saw a massive performance boost, not to mention that the CUDA drivers were far more reliable and up to date.

Mar 16 2016, 1:08 AM · Cycles, BF Blender