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  1. #581
    That's with 2.78c, latest master is many times faster on AMD cards.



  2. #582
    Member
    Join Date
    Feb 2017
    Location
    Colombia
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    4
    I got a rx 480 today and I can tell the performance boost in 2.79 with Linux on the latest AMDGPUpro driver, for example Koro scene rendered in just 9 minutes, that's bookers!!! (with 2.78c it took like 40minutes) but I see something pretty strange with RAM usage, with 2.78c the RAM usage goes around 400M but with 2.79 it goes to 2394M, I tried another scene that I know consumes a lot of RAM. Pool deck scene from architecture academy, not part of the benchmark scenes, so with 2.78c the RAM usage was 2662M, but with 2.79 the RAM usage was 4663M, it is if there were a constant overhead in RAM usage. Not sure if it's a bug or this extra 2gb of RAM usage is part of the improvement. For me it doesn't matter much because I have the 8gb version but for others that only have 4gb may be a concern.

    Another thing that I like to point out is that I can now see videos while rendering with 2.78c or 2.79, with my last nvidia card, gtx 750ti, I could never do that because the GUI always got laggy no matter how big or small the scene was.



  3. #583
    Member lluc84's Avatar
    Join Date
    Jan 2009
    Location
    Barcelona
    Posts
    139
    With the 2.79 I notice that ram usage increment too.
    http://www.artoutproductions.com/
    "Blender is not free is better than that it's opensource"



  4. #584
    Originally Posted by iszotic View Post
    I got a rx 480 today and I can tell the performance boost in 2.79 with Linux on the latest AMDGPUpro driver, for example Koro scene rendered in just 9 minutes, that's bookers!!! (with 2.78c it took like 40minutes) but I see something pretty strange with RAM usage, with 2.78c the RAM usage goes around 400M but with 2.79 it goes to 2394M, I tried another scene that I know consumes a lot of RAM. Pool deck scene from architecture academy, not part of the benchmark scenes, so with 2.78c the RAM usage was 2662M, but with 2.79 the RAM usage was 4663M, it is if there were a constant overhead in RAM usage. Not sure if it's a bug or this extra 2gb of RAM usage is part of the improvement. For me it doesn't matter much because I have the 8gb version but for others that only have 4gb may be a concern.

    Another thing that I like to point out is that I can now see videos while rendering with 2.78c or 2.79, with my last nvidia card, gtx 750ti, I could never do that because the GUI always got laggy no matter how big or small the scene was.
    Actually usage went down with optimizations but then a lot of features were added (volumes, SSS, principled = Disney BSDF, shadow catcher, etc.) So the kernel got bigger, using more memory. You can render smaller tile size and on command line to reduce memory usage. By the way, which tool did you use to measure your GPU memory usage on Linux? The figures reported by cycles itself have little to do with real memory usage. On Windows, you can use GPU-Z to see real memory usage (close all other apps as web browsers, etc... also take a lot of GPU memory)



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