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Tasklist

FS#63456 - [blender] Blender must be compiled with gcc 7

Attached to Project: Community Packages
Opened by Alberto (kong357) - Tuesday, 13 August 2019, 16:27 GMT
Last edited by Sven-Hendrik Haase (Svenstaro) - Saturday, 21 September 2019, 22:22 GMT
Task Type Bug Report
Category Packages
Status Closed
Assigned To Sven-Hendrik Haase (Svenstaro)
Architecture All
Severity Medium
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 0
Private No

Details

Description:
Blender must be compiled with gcc7. Compiling with gcc > 7 produces a very slow CPU+GPU render (rendering with just CPU is faster than CPU+GPU).

Check this thread out https://developer.blender.org/T64894

The problem is solved if blender is compiled with gcc7 as mentioned in their wiki "Building Blender" https://wiki.blender.org/wiki/Building_Blender

Steps to reproduce:
Download the file in the thread above (you can create your own file too), render with just CPU, then with CPU+GPU and check the rendering times.
This task depends upon

Closed by  Sven-Hendrik Haase (Svenstaro)
Saturday, 21 September 2019, 22:22 GMT
Reason for closing:  Upstream
Comment by Sven-Hendrik Haase (Svenstaro) - Tuesday, 03 September 2019, 13:15 GMT
I rebuilt blender against the most modern GCC 9 and CUDA. Please re-check.
Comment by Sven-Hendrik Haase (Svenstaro) - Tuesday, 03 September 2019, 15:08 GMT
If this still doesn't work as expected, please continue prodding upstream. Blender must absolutely work with gcc 9. Going back to gcc 7 will certainly not be an acceptable solution.
Comment by huyizheng (huyizheng) - Thursday, 05 September 2019, 10:09 GMT
Unfortunately, the latest blender in community repo (17:2.80-2) also has this problem.
Render that project metioned above with cpu only or gpu only will finish instantly, but if use both cpu+gpu it will take 2 minutes to finish.
Comment by Sven-Hendrik Haase (Svenstaro) - Thursday, 05 September 2019, 20:48 GMT
We've gotta get this fixed upstream. Try to get their attention again. Maybe ask them in IRC (#blendercoders in freenode). This is sometimes effective for me.
Comment by Sven-Hendrik Haase (Svenstaro) - Saturday, 21 September 2019, 22:22 GMT
Since this is already being tracked upstream and we can't really do anything about it except for putting gcc7 back into the repos which I'm not doing. We'll have to raise awareness about it upstream instead.

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