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

Lukas Stockner lukas.stockner at freenet.de
Wed Sep 16 01:01:46 CEST 2015

I noticed on Mint 17.1 that if you ran out of GPU memory before, subsequent
renders will sometimes also fail, even if they usually work (like an empty
scene). After rebooting or restarting the X server, the same scene works 
I suppose that this is a problem with the memory handling in the 
Linux kernel, which would mean it's outside of Cycles' influence.

On Di., Sep. 15, 2015 at 2:56 nachm., Thomas Dinges < blender at dingto.org 
[blender at dingto.org] > wrote:
This is pretty much a known issue, since day 1 of the experimental kernel. 
added the experimental kernel for features such as SSS, which are the cause 
the memory peak (or rather SSS enabled as part of our mega kernel).
The only real solution here will be the CUDA split kernel. That split might
still happen later this year, it's on our todo list.

Until then, as Brecht said, use it at your own risk.

Am 15.09.2015 um 19:54 schrieb Piotr Arlukowicz:
Thank you Brecht, I understand this and that's OK with memory, but... still
1.5GB is not enough even for empty scene... ? Come on! :)
I was so desperate that I started to look which GTX should I buy. Surely 
with 6GiB is a great graphics card, but WILL it work?

Few months ago Cycles worked in experimental mode just very well and as I 
require it to be bulletproof, this memory lag just kicks me out :( Sorry 
sharing personal mood on the list. I hope somebody can advice what to do.
Because I don't know if 6GB will be enough, and then there is also Titan 


Piotr Arlukowicz, BFCT
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http://polskikursblendera.pl [http://polskikursblendera.pl]

2015-09-15 18:08 GMT+02:00 Brecht Van Lommel < brechtvanlommel at pandora.be 
[brechtvanlommel at pandora.be] > :
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.
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