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Maniphest T42843

Cycles CUDA render slows waaay down after ~5 frames (from ~2s to ~40s per frame).
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Description

System Information
I7-4770K 3.5GHz, 16G RAM, Windows8.1 x64, GTX760 (2x non SLI).
I7-920 2.67GHz, 12G RAM, Windows7 Pro, GTX460

Blender Version
Broken:2.72 Gooseberry 2014-12-02 e7d0c58. Reproduced it with the 2.72b release
Worked: (works fine with CPU in same versions)

Short description of error

Exact steps for others to reproduce the error
Load attached scene and render using "Animation" button in camera props. Speed drastically slows down after ~frame 5. Similar slowdown does not happen using CPU.

scratch.blend4 MBDownload
. Render time drops from ~2s to ~40s. I have worked around this problem by batching 5 frame chunks using command line; i.e.:

blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 001 -e 005 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 006 -e 010 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 011 -e 015 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 016 -e 020 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 021 -e 025 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 026 -e 030 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 031 -e 035 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 036 -e 040 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 041 -e 045 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 046 -e 050 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 051 -e 055 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 056 -e 060 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 061 -e 065 -a
blender -b c:\tmp\scratch.blend -o tmp -F TARGA -x 1 -s 066 -e 070 -a

Related Objects

Event Timeline

jay banchero (dynaperspective) created this task.Dec 8 2014, 9:12 PM
jay banchero (dynaperspective) raised the priority of this task from to 90.
jay banchero (dynaperspective) updated the task description. (Show Details)
jay banchero (dynaperspective) edited a custom field.
jay banchero (dynaperspective) added a subscriber: jay banchero (dynaperspective).
Bastien Montagne (mont29) assigned this task to Sergey Sharybin (sergey).Dec 9 2014, 6:04 PM
Bastien Montagne (mont29) added projects: BF Blender, Cycles.
Sergey Sharybin (sergey) lowered the priority of this task from 90 to 30.Dec 9 2014, 10:32 PM

I remember reports like this and they were caused by some addons. Please try adding --factory-startup to a command line (before -b) and see if it makes any difference.

jay banchero (dynaperspective) added a comment.Dec 10 2014, 5:27 AM

Hi Sergey...

That fixed it (adding "--factory-startup"). Any idea which addon causes the problem?

Thank you, btw.
j.

Julian Eisel (Severin) changed the task status from Unknown Status to Archived.Dec 10 2014, 7:34 AM
Julian Eisel (Severin) added a subscriber: Julian Eisel (Severin).

Glad it works again. Let's close the report though :)

Julian Eisel (Severin) added a comment.Dec 10 2014, 8:46 AM

I'd suggest disabling one add-on after the other, to see which one causes the slowdown. You can then contact the author to see if that's a known issue. If not, you can create a new report in the add-on bug tracker.

Anyway, thanks for the report @jay banchero (dynaperspective)

jay banchero (dynaperspective) added a comment.Dec 17 2014, 8:06 PM

It looks like the "Measure Panel" Addon is the cause of this problem. After disabling it and restarting Blender the problem goes away.

Sergey Sharybin (sergey) added a comment.Dec 17 2014, 8:17 PM

@jay banchero (dynaperspective), do you mind reporting it to the Addons tracker and assigning it to one of the addon authors?

jay banchero (dynaperspective) added a comment.Dec 17 2014, 11:16 PM

Done: https://developer.blender.org/T42940