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Background rendering longer 10 times than UI rendering
Closed, InvalidPublic

Description

System Information
Operating system and graphics card
Gentoo amd64, Ubuntu x64 (different machines) ; gtx 780, titan black; 6 and 7 cuda versions
Blender Version
Broken:2.74, 2.75
Worked: not found

Short description of error
Hello
Please help me to solve this problem.
I run several scenes in background render via "blender -b my.blend -a"
And get veeeeryyy long rendering time.
Why?
This is my scene (559MB) https://yadi.sk/d/9vPLDCvjhh3Yx
Please test it to compare background and ui render times
Thank you

Details

Type
Bug

Event Timeline

Could you try to first reproduce this behavior with a smaller scene? Having to download 560MB makes checkin the bug a bit unpleasant ;)

Bastien Montagne (mont29) triaged this task as Needs Information from User priority.
Bastien Montagne (mont29) claimed this task.

No news since one week…

Hello
It occurs only with the scene with the flag. In other scenes, there is no problem
I can't to change a flag scene to more smaller, because it has backed cloth.
So, try to test it.
Thank you for Blender developing!

I tested the scene with dimensions set to 40% and I get the exact same render speed per frame when starting with F12 from within Blender and from commandline. Tested on OSX 10.10 with GTX970.