Davinci Resolve very slow rendering

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xadfxx

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Davinci Resolve very slow rendering

PostSat Feb 27, 2021 5:00 pm

Hello,
Since I updated Davinci Resolve I have problems with the render speed...
I will get 5 frames per seconds... And the CPU usage is on 20%.
If i change the resolution of the video from HD to any less resolution the render speed will not increase... It is kind of capped...
Any solution?
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Peter Chamberlain

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Re: Davinci Resolve very slow rendering

PostSun Feb 28, 2021 8:41 am

Which specific OS, Resolve, GPU and GPU driver r u using?
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xadfxx

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Re: Davinci Resolve very slow rendering

PostSun Feb 28, 2021 6:44 pm

I use Windows 10, the newest Version of Resolve and GTX1060 / I7-8700k with the latest driver...
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Peter Chamberlain

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Re: Davinci Resolve very slow rendering

PostMon Mar 01, 2021 3:13 am

"latest driver' doesnt help at all im afraid
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xadfxx

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Re: Davinci Resolve very slow rendering

PostMon Mar 01, 2021 10:54 am

Peter Chamberlain wrote:"latest driver' doesnt help at all im afraid

What can I do yet? When I render only audio it will also have a speed from 5 frames per second...
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Gary Hango

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Re: Davinci Resolve very slow rendering

PostMon Mar 01, 2021 2:49 pm

Go to Preferences > Memory/GPU and make sure it is set to CUDA, not OpenCL.
Microsoft Windows 10 Pro x64
Intel(R) Core(TM) i7-6700, 3.40GHz, 32.0 GB
MB: MSI, BIOS: American Megatrends Inc. A.60, 12/17/2015
NVIDIA GeForce GTX 960, 2Gb
Resolve 18.1.1.0007(Free)
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waltervolpatto

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Re: Davinci Resolve very slow rendering

PostMon Mar 01, 2021 4:11 pm

xadfxx wrote:
Peter Chamberlain wrote:"latest driver' doesnt help at all im afraid

What can I do yet? When I render only audio it will also have a speed from 5 frames per second...


Which nvidia drivers exactly?
W10-19043.1645- Supermicro MB C9X299-PGF - RAM 128GB CPU i9-10980XE 16c 4.3GHz (Oc) Water cooled
Decklink Studio 4K (12.3)
Resolve 18.5.1 / fusion studio 18
GPU 3090ti drivers 512.59 studio
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wireless112

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Re: Davinci Resolve very slow rendering

PostMon Mar 01, 2021 6:41 pm

I have noticed that DR isn't using all my resources either. I am not complaining. It's comforting to know my frame rate would double if it did.

My details are in my signature. DR 17.0 Studio.

I am sitting at 22% CPU and 54% GPU, you folks with 3090's must be crying to see how little is being used. Maybe fusion uses more, I haven't played with that component much.

I think my encoding and playback are all about the same as the last time I fired it up, if not maybe just a bit better. The software must have just gotten more efficient. When color correction is required, encoding to Cineform varies at 17-24.5. (1920x1080 P 59.94 to 1280x720 P 59.94) When no color correction is required it shoots north of 320 with my current source material. I think my previous best was 224, so a definite improvement.

I'd be curious to see if GPU consumption holds steady around 54% no matter the GPU? In otherwords older GPU's at 54% are going to be a lot slower than the latest and greatest at 54%.

With the last 16. I used last March, I recall seeing my GPU nearly pegged during rendering.

I have already verified the GPU is set to CUDA mode.

I haven't peeked at the current manual yet, maybe the answer is in it. Just thought I'd offer my observations since I seen this post from a user who is right at 20-22% CPU like me. Chances are I have a boatload more stuff running that isn't DR compared to OP. And with a processor that mine would walk all over. So it has me wondering a little bit if there isn't a percentage cap written in? A guy with a i7-8700k shouldn't be pegging at 20% if a Threadripper 1950X is also pegging at 22%. Something is not quite right about that. I would also expect the 1060 to do better than 5 FPS at 100% utilization. I bet if OP looks he might be sitting around 50% GPU utilization as well.

EDIT - It occurred to me DR may be throttling for safety reasons, if the software were allowed to run full steam a road warrior might start his bed on fire. :) Maybe it's time to release two versions? One for real PC's and one for the Road Warriors. Maybe a third for liquid coolers? I know, too much to ask for a perpetual license. Maybe there is a way a single release can run differently based on the likelihood of someone burning their legs?

I understand it's better to keep the Laptop from thermal meltdown for job security reasons as well, if the laptop crashes between saves that would wipe out all the time you saved by using a laptop in the first place.
Jeremy Johnson

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xadfxx

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Re: Davinci Resolve very slow rendering

PostMon Mar 01, 2021 7:28 pm

Gary Hango wrote:Go to Preferences > Memory/GPU and make sure it is set to CUDA, not OpenCL.

OMG, that was the problem! THANKS!
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FatVeganLiberator

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Re: Davinci Resolve very slow rendering

PostFri May 24, 2024 6:54 pm

xadfxx wrote:
Gary Hango wrote:Go to Preferences > Memory/GPU and make sure it is set to CUDA, not OpenCL.

OMG, that was the problem! THANKS!


I really wish this was the issue I was having, it renders fast as hell, but the second it hits a clip with fusion elements, BAM! YOU SHALL RUN SLOW!

Like 1 FPS render slow! It's like 31% GPU Usage & 15-20% CPU when I try to render this.

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