Prerender phase memory consumption twice as big compared to 2.79 with subdiv modifier #70530

Closed
opened 2019-10-04 16:46:56 +02:00 by Yegor · 9 comments

System Information
Operating system: Linux-3.10.0-957.10.1.el7.x86_64-x86_64-with-centos-7.6.1810-Core 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.56

Blender Version
Broken: version: 2.81 (sub 13), branch: master, commit date: 2019-10-04 13:28, hash: d590db8370
Worked: 2.79 latest

Short description of error
This problem is noticeable on big scenes.
I have a huge city scene from alembic of 1Gb size. Blender 2.79 consumes about 30gigs peak on rendering (on caching and bvh building), while 2.81 eats up all 64Gb + 20Gb of swap and closes.
I shrunk the scene as much as possible, but the problem can still be seen.
Now this cut down scene consumes 3.2 Gb in 2.79 and 6.2Gb in 2.81.
All meshes have one subdivision modifier enabled.

I don't know what kind of magic Renderman uses, but it consumes only 3Gb on the whole scene (that one, which eats up all of my RAM in 2.81) with subdivs.
Adaptive subdivision in Blender makes it a lot worse than static subdiv even with 8 pixels dice rate.

Exact steps for others to reproduce the error
Open each file, hit render and compare the memory consumption.

Can't attach because of the size. Here are the links to download:
https://drive.google.com/open?id=1MVUfe2yqmxzkNNt6XroVAgs7x774RvOo
https://drive.google.com/open?id=1O9gPOTM1mviNcx1FaSw2aRGRYIRRQYtF

**System Information** Operating system: Linux-3.10.0-957.10.1.el7.x86_64-x86_64-with-centos-7.6.1810-Core 64 Bits Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.56 **Blender Version** Broken: version: 2.81 (sub 13), branch: master, commit date: 2019-10-04 13:28, hash: `d590db8370` Worked: 2.79 latest **Short description of error** This problem is noticeable on big scenes. I have a huge city scene from alembic of 1Gb size. Blender 2.79 consumes about 30gigs peak on rendering (on caching and bvh building), while 2.81 eats up all 64Gb + 20Gb of swap and closes. I shrunk the scene as much as possible, but the problem can still be seen. Now this cut down scene consumes 3.2 Gb in 2.79 and 6.2Gb in 2.81. All meshes have one subdivision modifier enabled. I don't know what kind of magic Renderman uses, but it consumes only 3Gb on the whole scene (that one, which eats up all of my RAM in 2.81) with subdivs. Adaptive subdivision in Blender makes it a lot worse than static subdiv even with 8 pixels dice rate. **Exact steps for others to reproduce the error** Open each file, hit render and compare the memory consumption. Can't attach because of the size. Here are the links to download: https://drive.google.com/open?id=1MVUfe2yqmxzkNNt6XroVAgs7x774RvOo https://drive.google.com/open?id=1O9gPOTM1mviNcx1FaSw2aRGRYIRRQYtF
Author

Added subscriber: @YegorSmirnov

Added subscriber: @YegorSmirnov

#73564 was marked as duplicate of this issue

#73564 was marked as duplicate of this issue

Added subscribers: @brecht, @mano-wii

Added subscribers: @brecht, @mano-wii

@brecht, can you tell if this is a known issue?

@brecht, can you tell if this is a known issue?

Added subscriber: @StanislavOvcharov

Added subscriber: @StanislavOvcharov

Changed status from 'Needs Triage' to: 'Archived'

Changed status from 'Needs Triage' to: 'Archived'
Brecht Van Lommel self-assigned this 2020-01-20 09:56:31 +01:00

Adaptive subdivision is not properly working yet in 2.80, and will subdivide the mesh both in Blender and Cycles. This is a known issue, one of the reasons it is still an experimental feature.

Adaptive subdivision is not properly working yet in 2.80, and will subdivide the mesh both in Blender and Cycles. This is a known issue, one of the reasons it is still an experimental feature.

Tasks for adaptive subdivision are listed in #53901 (Cycles adaptive subdivision tasks).

Tasks for adaptive subdivision are listed in #53901 (Cycles adaptive subdivision tasks).

Added subscribers: @mrTorb, @iss, @MarcinTwarowski, @EAW

Added subscribers: @mrTorb, @iss, @MarcinTwarowski, @EAW
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Reference: blender/blender#70530
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