Rendering...1 time 2 fps..other time 8 fps

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martyeu

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Rendering...1 time 2 fps..other time 8 fps

PostMon Feb 19, 2024 3:36 am

Hia guys. I am rendering a project.

To see how it would look like...than I edit a bit, but i ussually make changes towards end of the timeline.

I hit render, same settings, same everything...

But some parts of the video render like 0-2 fps, but if I restart, they go like 8fps.

Memory usage and gpu memory usage is about same in both scenarios.

Though, I noticed that if I do not restart, it looks like less cpu cores are in use ( during render only ).

Temps are about same. The cpu does not throttle.

CPU: Intel Core i9-13900K, not overclocked
MB: MSI MAG Z790 TOMAHAWK WIFI (MS-7D91)
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Uli Plank

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Re: Rendering...1 time 2 fps..other time 8 fps

PostMon Feb 19, 2024 4:19 am

Any caching going on?
Now that the cat #19 is out of the bag, test it as much as you can and use the subforum.

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martyeu

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Re: Rendering...1 time 2 fps..other time 8 fps

PostMon Feb 19, 2024 1:10 pm

Uli Plank wrote:Any caching going on?


Same thing happening with smart/user or off.
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CodeTech

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Re: Rendering...1 time 2 fps..other time 8 fps

PostTue Feb 20, 2024 3:54 am

I have a similar observation. I have a 2160p60 project I'm working on, and the longer I work on it the slower the render will be. One time I gave up about 2 hours into the render and it hadn't even reached 50%.
If I restart Resolve and render, it's typically an hour and 5 or 10 minutes.. Last night it actually went to 53 minutes.
The difference in these render times are significant, but nothing else is changing.
Resolve Studio 19b1, Win11, i7-13700K, 64GB DDR5 RAM, 3080Ti (12GB) (551.86 Studio), 5TB M.2 SSDs, 90TB+ HDs, Three 4K monitors: 27", 28", 43", Focusrite Scarlett 2i4, Presonus Studio Monitors
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martyeu

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Re: Rendering...1 time 2 fps..other time 8 fps

PostTue Feb 20, 2024 4:33 am

Uli Plank wrote:Any caching going on?


I wonder where did my answer to this dissapear...

Same results with Smart/User/None
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martyeu

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Re: Rendering...1 time 2 fps..other time 8 fps

PostTue Feb 20, 2024 4:37 am

CodeTech wrote:I have a similar observation. I have a 2160p60 project I'm working on, and the longer I work on it the slower the render will be. One time I gave up about 2 hours into the render and it hadn't even reached 50%.
If I restart Resolve and render, it's typically an hour and 5 or 10 minutes.. Last night it actually went to 53 minutes.
The difference in these render times are significant, but nothing else is changing.



I have done 35 tests on 4 min long video.

Render times are relatively random. Which is really confusing. It ranges from 5 to 15 minutes. But each time i restart davinci and hit render, the render times lean towards 5 min.
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Dennis NL

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Re: Rendering...1 time 2 fps..other time 8 fps

PostTue Feb 20, 2024 7:07 pm

Working with 8K that you downscale? Or multiple heavy sfx? Noise reduction and anti flickering?
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Ken Wald

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Re: Rendering...1 time 2 fps..other time 8 fps

PostTue Feb 20, 2024 8:31 pm

I've been seeing the same behavior in Windows 10 since upgrading to 18.6.4 from 18.5.1 - abnormally slow renders that speed up after restarting Resolve, along with some random hangs and crashes.

I'll try to catch the behavior in a log, and will post it up here.
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martyeu

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Re: Rendering...1 time 2 fps..other time 8 fps

PostWed Feb 21, 2024 9:52 pm

Dennis NL wrote:Working with 8K that you downscale? Or multiple heavy sfx? Noise reduction and anti flickering?


Usually 4k vids and the parts that differs the most in render speed ...Some split screen, 4x4, bit of cc, speedwarp and some text..

What i still dont understand: no restart = 1-2 fps render, restart = 8 fps ( talking about 10 seconds of the video that makes most of issue ), but there is few other parts that behave similairy.

So just not really sure what happens if i edit a bit, than hit render... or restart and hit render right away.
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martyeu

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Re: Rendering...1 time 2 fps..other time 8 fps

PostWed Feb 21, 2024 9:53 pm

Ken Wald wrote:I'll try to catch the behavior in a log, and will post it up here.


Ok. Hopefully we can figure out something.
Last edited by martyeu on Wed Feb 21, 2024 10:15 pm, edited 1 time in total.
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Dennis NL

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Re: Rendering...1 time 2 fps..other time 8 fps

PostWed Feb 21, 2024 9:58 pm

Is it the same shot every time? Tried rendering in place?

Had the same problem as you, only with me DR crashed. My problem was heavy sfx, rendering in place helped a lot..
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martyeu

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Re: Rendering...1 time 2 fps..other time 8 fps

PostWed Feb 21, 2024 10:21 pm

Dennis NL wrote:Is it the same shot every time? Tried rendering in place?

Had the same problem as you, only with me DR crashed. My problem was heavy sfx, rendering in place helped a lot..


Same timeline, same project. Let me put it this way.

Scenario 1:
I open davinci, start editing, done editing & tweaking.. hit render...More time I spent in editing, longer it takes to render, even the parts that were not touched when editing, are rendering slower.

Scenario 2:
I open davinci, not editing or changing anything, leave it open for some time, lets say an hour or two..I hit render, things are rendering slower, not as bad as in scenario 1, but still noticably slower.

Scenario 3:
I open davinci, go to render page, choose my preset, hit render, it goes a lot faster. The worst parts of the video render around 8 fps instead of 0-2 fps like in scenario 1 and 2

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