Memory not freed after several renders #56825

System Information
Linux Fedora 28 x64

Nvidia 1060 (3Go)

Blender Version
blender-2.79-5c10c92b23c-linux-glibc224-x86_64

Short description of error
Repeating the same render grows memory and fill it until no render is possible, freezing computer.

Exact steps for others to reproduce the error
To check the problem, it's better to have a heavy scene to rendern for example using Adaptive subsurface (micro displacement) or hair. The first time I render the image is ok and fast, then I rerender the scene (modifying camera angle, for example) and rerender, then rerender, and so on... After a while, the render is very slow, and may fill the memory. If I stop blender, and reopen the scene, it's ok.

I must admit that I use Cycles with CUDA and not tried without GPU.

Added subscriber: @Metal3d

CUDA 9.1

Added subscriber: @mont29

Please follow our submission template and guidelines, also read these tips about bug reports, and make a complete, valid bug report, with required info, precise description of the issue (only ONE issue per report!), precise steps to reproduce it, small and simple .blend and/or other files to do so if needed, etc.

The step is simple. Make a scene and rendre it several times. You should see that memory is not freed.

I will try to make a .blend file and memory capture to show you.

Note: the latest release doesn't start on my computer. I need to start latest build.

Ok I can give you a simple .blend file and a log file where the date, nvidia-smi and "free -m" output is done. Each time I pressed F12 and the render is finished, I logged that output.

You can see that the "used" column grows up each time. This scene is simple so it grows up 200Mo approximativally. Certain scene append 500Mo, 1Go... to RAM. That means that I should stop blender and restart it to empty memory usage to be able to render again.

Is that sufficient ? I can use "ps" output to point blender binary if needed.

Zip file is here https://drive.google.com/file/d/1PMTGPDJW3yGhi1szPw9XbkDn_uqcjpo9/view?usp=sharing

Regards,

Added subscriber: @YAFU

Hi. I'm not a developer. Do you mean System RAM or vRAM?
If you refer to system RAM, the following problem has been solved only for Blender 2.79b. The problem still persists for 2.79 from master and 2.8:
https://developer.blender.org/T54287

If you are referring to vRAM, you should test with Blender factory settings without addons enabled.

Changed status from 'Open' to: 'Archived'

@YAFU right, at the same time you answered I pointed my report to the issue you've pointed ;)

And that's right that given MALLOC_CONF can stop the problem for a time. So I can close that issue and follow the one you gave.

Thanks a lot for you help (and thanks to the community for Blender, using it since 1999 and impressed of what it is going do be)

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Memory not freed after several renders #56825