command line render with OpenCL is much slower than in the GUI #49233

New Issue

mathieu menuet · 2016-09-02T20:52:06+02:00

mathieu menuet commented

2016-09-02 20:52:06 +02:00

System Information
Win7, RX480 and 280x, 16.8.3 and 16.7.3.

Blender Version
Broken: 2.78RC

Short description of error
Rendering a scene with OpenCL from the command line with -b and -a is much slower than from the GUI (on RX480 and 280x at least). It is the contrary with CPU (faster with cmd rendering)

Exact steps for others to reproduce the error
Take one of the official benchmark scene, render it on the cmd and then in the GUI, compare the times.

**System Information** Win7, RX480 and 280x, 16.8.3 and 16.7.3. **Blender Version** Broken: 2.78RC **Short description of error** Rendering a scene with OpenCL from the command line with -b and -a is much slower than from the GUI (on RX480 and 280x at least). It is the contrary with CPU (faster with cmd rendering) **Exact steps for others to reproduce the error** Take one of the official benchmark scene, render it on the cmd and then in the GUI, compare the times.

mathieu menuet commented

2016-09-02 20:52:06 +02:00

Changed status to: 'Open'

mathieu menuet commented

2016-09-02 20:52:06 +02:00

Added subscriber: @bliblubli

Sergey Sharybin self-assigned this 2016-09-05 10:17:20 +02:00

Sergey Sharybin commented

2016-09-05 16:12:34 +02:00

Run some preliminary investigation, but kernels are the same and compilation flags are also the same. The code has no checks for headed/headless mode as well.

Can you attach fill log of blender --debug-cycles collected for headless and headed renders?

Run some preliminary investigation, but kernels are the same and compilation flags are also the same. The code has no checks for headed/headless mode as well. Can you attach fill log of `blender --debug-cycles` collected for headless and headed renders?

mathieu menuet commented

2016-09-09 21:39:19 +02:00

Trying to reproduce the bug on benchmark files, I couldn't. It may be due to some drivers that where not run on cmd render. Unfortunately, I can't remember the file/blender version/ driver version combination that was triggering this problem. It may be simply solved with latest drivers and latest master. You can close this report until I find more infos.
Thanks for the help.

Trying to reproduce the bug on benchmark files, I couldn't. It may be due to some drivers that where not run on cmd render. Unfortunately, I can't remember the file/blender version/ driver version combination that was triggering this problem. It may be simply solved with latest drivers and latest master. You can close this report until I find more infos. Thanks for the help.

Bastien Montagne commented

2016-09-16 17:25:29 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2016-09-16 17:25:29 +02:00

Changed status from 'Open' to: 'Archived'

Bastien Montagne closed this issue

2016-09-16 17:25:29 +02:00

Bastien Montagne commented

2016-09-16 17:25:29 +02:00

Archiving for now then.

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command line render with OpenCL is much slower than in the GUI #49233