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Would GPU lightmap baking benefited from SLI?

Discussion in 'Global Illumination' started by herbertng, Jul 18, 2019.

  1. herbertng

    herbertng

    Joined:
    Feb 21, 2013
    Posts:
    3
    Hi, has anyone had experience with dual GPU on Unity? Would having a SLI setup further accelerate the GPU baking process?

    Thank you!
     
  2. INGTONY

    INGTONY

    Joined:
    Oct 13, 2014
    Posts:
    24
    No, i have titans x runing on sli , and really does not work at all , i get 2.1 % of load when baking with gpu (preview) and its pretty similar time to the CPU baking i have not see and improvement here
     
  3. herbertng

    herbertng

    Joined:
    Feb 21, 2013
    Posts:
    3
    thank you! I'm also running 2018.3 gpu preview on notebook 1060 max-q, worked much better than my mobile CPU, and wonderful for my desktop upgrade should i go with a multi GPU setup. guess i'd just go with one gpu then! thnak you
     
  4. KEngelstoft

    KEngelstoft

    Unity Technologies

    Joined:
    Aug 13, 2013
    Posts:
    1,298
    Hi! SLI will not give you any improvement but assigning a dedicated GPU to the lightmapper will. By default, the editor rendering and the GPU lightmap baking is running time sliced on the same GPU but if you have multiple high performance GPUs in your machine, run the editor on one GPU and use another dedicated GPU for baking, using a command line parameter to specify a specific GPU for baking. See the 'How to select a specific GPU for baking' section in the first post in this thread: https://forum.unity.com/threads/gpu-lightmapper-preview.561103
    This has the additional benefit of reducing memory pressure on the GPU used for baking, as it is a very memory hungry process. We are working on optimizing memory usage.
    True multi-GPU is on the roadmap but will not happen until after the lightmapper leaves preview.
     
  5. herbertng

    herbertng

    Joined:
    Feb 21, 2013
    Posts:
    3
    Thank you so much! This is very helpful!
     
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