Performance regression when rendering at very high resolution CPU+GPU - Cycles #85016

New Issue

Jakub Jaszewski · 2021-01-24T13:04:25+01:00

Jakub Jaszewski commented

2021-01-24 13:04:25 +01:00

System Information
Operating system: Linux
Graphics card: AMD Radeon VII (VEGA20, DRM 3.40.0, 5.10.0-1-rt-amd64, LLVM 11.0.1) version: 4.6 (Core Profile) Mesa 20.3.3
system-info.txt

Blender Version
Broken: 2.93.0 Alpha, branch: master, commit date: 2021-01-22 18:30, hash: aaa1d58054,
Worked: N/a

Short description of error
Following issue with rendering at very high resolution #82591. It seems that the regression is also present when rendering with CPU+GPU. OpenCL in my case.

Here the results using the attached file:
There should be visible drops in CPU and GPU utilisation:

For comparison change to CPU rendering and monitor it:

Exact steps for others to reproduce the error

open attached .blend file
set rendering engine to Cycles
check if CPU and GPU devices are enabled in System tab
render
monitor CPU and GPU usage

HYBRID_TEST_regression.blend

**System Information** Operating system: Linux Graphics card: AMD Radeon VII (VEGA20, DRM 3.40.0, 5.10.0-1-rt-amd64, LLVM 11.0.1) version: 4.6 (Core Profile) Mesa 20.3.3 [system-info.txt](https://archive.blender.org/developer/F9595264/system-info.txt) **Blender Version** Broken: 2.93.0 Alpha, branch: master, commit date: 2021-01-22 18:30, hash: aaa1d580548d, Worked: N/a **Short description of error** Following issue with rendering at very high resolution #82591. It seems that the regression is also present when rendering with CPU+GPU. OpenCL in my case. Here the results using the attached file: There should be visible drops in CPU and GPU utilisation: ![2021-01-24_12-38.png](https://archive.blender.org/developer/F9595261/2021-01-24_12-38.png) For comparison change to CPU rendering and monitor it: ![2021-01-24_13-01.png](https://archive.blender.org/developer/F9595270/2021-01-24_13-01.png) **Exact steps for others to reproduce the error** - open attached .blend file - set rendering engine to Cycles - check if CPU and GPU devices are enabled in System tab - render - monitor CPU and GPU usage [HYBRID_TEST_regression.blend](https://archive.blender.org/developer/F9595263/HYBRID_TEST_regression.blend)

Jakub Jaszewski commented

2021-01-24 13:04:25 +01:00

Added subscriber: @silex

Germano Cavalcante commented

2021-01-26 15:27:03 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-01-26 15:27:03 +01:00

I am not aware of the other report, but the description of this one says that it is a regression.
But what is the regression compared to?
Which version of Blender can we use to compare?

I am not aware of the other report, but the description of this one says that it is a regression. But what is the regression compared to? Which version of Blender can we use to compare?

Jakub Jaszewski commented

2021-01-26 16:11:19 +01:00

Whoops. I forgot to include working version.
Now that I'm trying to test, this issue is present even in 2.83.10 LTS! And I'm unable to find Blender version in which hybrid OpenCL rendering don't have CPU underutilisation problem.
I remember it working without a problem in 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: 3e85bb34d0. In the meantime I upgraded GPU drivers and Linux kernel and after that this release also have this problem.
Pasting old system-info.txt:
system-info-OLD.txt

Whoops. I forgot to include working version. Now that I'm trying to test, this issue is present even in 2.83.10 LTS! And I'm unable to find Blender version in which hybrid OpenCL rendering don't have CPU underutilisation problem. I remember it working without a problem in 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: 3e85bb34d0d7. In the meantime I upgraded GPU drivers and Linux kernel and after that this release also have this problem. Pasting old system-info.txt: [system-info-OLD.txt](https://archive.blender.org/developer/F9598812/system-info-OLD.txt)

Germano Cavalcante commented

2021-01-26 16:31:28 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Germano Cavalcante commented

2021-01-26 16:31:28 +01:00

So for the report to be complete and confirmed, it would be important to test different versions of the driver.
It is also possible that the problem is on the NVidia side and not in Blender.

So for the report to be complete and confirmed, it would be important to test different versions of the driver. It is also possible that the problem is on the NVidia side and not in Blender.

Jakub Jaszewski commented

2021-02-02 15:20:07 +01:00

I'm still trying to pinpoint exact driver <-> Blender version combination that was working better than current release and AMD drivers. It will take me couple more days I think.

Germano Cavalcante commented

2021-02-19 23:16:28 +01:00

Seeing the linked reports, I wonder if this problem has already been fixed in the latest build.
https://builder.blender.org/download/

Seeing the linked reports, I wonder if this problem has already been fixed in the latest build. https://builder.blender.org/download/

Germano Cavalcante commented

2021-03-15 01:46:41 +01:00

Changed status from 'Needs User Info' to: 'Archived'

Germano Cavalcante closed this issue

2021-03-15 01:46:41 +01:00

Germano Cavalcante commented

2021-03-15 01:46:41 +01:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed (especially since #85308 seems to be related).

Thanks for the report. If the problem persists this report can be reopened.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed (especially since #85308 seems to be related). Thanks for the report. If the problem persists this report can be reopened.

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Performance regression when rendering at very high resolution CPU+GPU - Cycles #85016