Cycles Optix rendering crash out #75954

Closed
opened 2020-04-21 09:51:05 +02:00 by Łukasz · 2 comments

System Information
Operating system:Windows 10
Graphics card: 1x Nvidia RTX 2080 Ti

Blender Version
Broken: Blender 2.82a
Worked: every previous version

When I render on Optix sometimes (50% times) rendering goes extremely slow after rendering the first tile of render

This is happening to me only on hudge scenes like 1,44GB. And this is not happening every time but quite often ( 50% of times )
To Explain that let's just assume that we have an interior scene which has nothing special in it ( I know that optix is not working with AO shader and branched path tracing)

  1. I hit render and first tile is rendering really fast and when I'm checking how my card is vorking cuda usage looks like this:
    94129783_231146671280322_3052305825587527680_n.jpg
  2. But after rendering first tile, second goest extremely slow and my cuda usage looks like this
    93826820_253089662483262_7563975413039366144_n.jpg
    and expected time of rendering goes from 1hour up to 15 hours or even 20 hours

I know that you might say that not every tile is rendering with the same speed but that is not an issue. When I restart Computer or sometimes when I restart blender or sometimes when I prerender scene for something like 1 minute with material override option enabled render goes in the correct manner. What I mean by that is that:

**System Information** Operating system:Windows 10 Graphics card: 1x Nvidia RTX 2080 Ti **Blender Version** Broken: Blender 2.82a Worked: every previous version When I render on Optix sometimes (50% times) rendering goes extremely slow after rendering the first tile of render This is happening to me only on hudge scenes like 1,44GB. And this is not happening every time but quite often ( 50% of times ) To Explain that let's just assume that we have an interior scene which has nothing special in it ( I know that optix is not working with AO shader and branched path tracing) 1. I hit render and first tile is rendering really fast and when I'm checking how my card is vorking cuda usage looks like this: ![94129783_231146671280322_3052305825587527680_n.jpg](https://archive.blender.org/developer/F8486645/94129783_231146671280322_3052305825587527680_n.jpg) 2. But after rendering first tile, second goest extremely slow and my cuda usage looks like this ![93826820_253089662483262_7563975413039366144_n.jpg](https://archive.blender.org/developer/F8486647/93826820_253089662483262_7563975413039366144_n.jpg) and expected time of rendering goes from 1hour up to 15 hours or even 20 hours I know that you might say that not every tile is rendering with the same speed but that is not an issue. When I restart Computer or sometimes when I restart blender or sometimes when I prerender scene for something like 1 minute with material override option enabled render goes in the correct manner. What I mean by that is that:
Author

Added subscriber: @sohoha

Added subscriber: @sohoha
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Closed as duplicate of #75955

Closed as duplicate of #75955
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Reference: blender/blender#75954
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