OK, after 2 sleepless nights i finally solved it. Reinstalled OS X, Yosemite, CUDA, Nvidai Web driver… and nothing… took from time machine 4 TB data back, over long hours selectively to have it as clean as it gets… and then still nothing…
Installed latest official and did a lot of animation tests… over 12 hurs long… still the same problem below soon i nearly gave up…
Booted in Windows… worked perfect… lol…
THE PROBLEM: It is not cuda, or the drivers, it were .py script addons that manipulates the geometry at render time. Somehow Cycles loses sync between the GPUs and fills the whole GPU memory. Some weird .py interaction is happening.
THE SOLUTION:
I had to delete all addons in the blender directory and delete any preferences and re-set blender settings fresh. Now i have no 3rd party rig system, but it will be ok, due to the simple animation i have to do.
The only things i kept were the clearly not harmful themes and shaders.
At least i have the production system fresh and TM restored with Yosemite. Now it works flawless.
The good side: I did with this occasion a lot of cleanup and ordering in my file system. Always look on the bright side of life.
Gosh was i desperate… Now i can sleep. LOL
Hello,
i have a huge rendering problem now with 2.72a and b with rendering out ANY animation.
The frames are rendered, but after the 3rd or 4th frame, the cards simply jump over the tiles, not rendering anything, and if i let it so for 10 secs and do not abort, it will crash blender completely and stuck at building BHV!
Viewport rendering is also affected in another style: it won’t crash, but after switching Rendering On/Off a few times, CX CUDA Memory error or Sync Error will happen although not crashing blender in this case (this although will happen with memory intensive stuff, yet still smaller than about half of the GPU free memory!).
In BOTH cases, you can’t even render after that even a still, i need to close and open blender again. Then it works again, but with the same issues. A restart won’t fix it either.
The cards are 780 6GB Models and the scene is really small 200mb ? OSX Mavericks 10.9.5, Official Nvidia Webdriver, latest CUDA.
This even happens if i choose a single card only. No matter the scene, heavy or light or any shaders. Also this happens both on experimental AND supported GPU.
Everything else works perfectly, it can’t be CUDA. Octane Render, LuxRender, Adobe Mercury Engine, DaVinci, etc… flawless.
i7 3770K - 16GB - 3x780 6GB - OSX
Something is not ok i guess with Cycles and CUDA.
I need to render out on 2.72, AND i need ALL the GPUs. Please help!
UPDATE: This also happens on another IDENTICAL non-render machine with Yosemite but only two 780 6GB cards.
UPDATE 2: Latest buildbot blender-2.72-88fe896 same issues.
PS: I have the feeling that somewhere between 2.70 and 2.72 the sync of the gpus got messed up for animation ?