[Bf-cycles] still memory problem with cuLaunch on GTX780Ti 3GB with empty scene

[Brecht Van Lommel]

Experimental mode uses significantly more memory. I don't know if this
is more than expected at the moment, but it wouldn't surprise me.

This memory usage is one of the main reasons it's called experimental
mode, if all the features there worked well they would not be called
experimental. I know a lot of users enable this but it's really at
your own risk.

On Tue, Sep 15, 2015 at 5:09 PM, Piotr Arlukowicz
<piotao at polskikursblendera.pl> wrote:
> Hey
>
> something is definitely not right with cycles or with my system, because of
> the old and known memory problem with cuLaunch.
> The exact error is:
> CUDA error: Out of memory in
> cuLaunchKernel(cuPathTrace,xblocks,yblocks,1,xthreads,ythreads,1,0,0,args,0)
> Peak mem shown by blender is 70.98M during rendering.
>
> Works: GPU compute with supported mode
> Fails: GPU compute with experimental mode
> System: Mint 17.1,
> Blender hash dbe1829...
> GPU: GTX780Ti, ram 3070M
>
> please help!
>
> I've read stackexchange explanations about memory problems and this seems to
> be not the case (?) here, because I have at least half of memory
> unoccupied...
>
> Here is nvidia-smi test while blender IS rendering a scene in supported
> mode.
>
> +------------------------------------------------------+
> | NVIDIA-SMI 352.21     Driver Version: 352.21         |
> |-------------------------------+----------------------+----------------------+
> | GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr.
> ECC |
> | Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute
> M. |
> |===============================+======================+======================|
> |   0  GeForce GTX 780 Ti  Off  | 0000:02:00.0     N/A |
> N/A |
> | 50%   67C    P0    N/A /  N/A |   1459MiB /  3070MiB |     N/A
> Default |
> +-------------------------------+----------------------+----------------------+
>
> I know that I'm using desktop enviroment, but honestly, there is only half
> of ram on that card occupied. This problem is the same since several
> revisions and I'm slowly made myself upset that I can't use the hardware.
> 3GiB of ram, honestly, SHOULD be enough for an empty scene!
>
> What I'm doing wrong?
> please help or at least say something...
>
> pio
>
>
> Piotr
> Arlukowicz, BFCT
>
> YT: /user/piotao?feature=guide
>  FB: /polskikursblendera TW: /piotao
> Blender Network: https://www.blendernetwork.org/piotr-arlukowicz
> Polski Kurs Blendera: http://polskikursblendera.pl
>
>
>
>
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