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Thread: Amd epyc?

  1. #1
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    Amd epyc?

    Hi guys

    We have aquired two new dual 64thread workstations with AMD 7371 CPUS. It was surprising to see that it does not perform very well in LW 2019.

    When we run 1 thread only it does well, but once we use more than 4 threads tis efficiency drops like a rock making it slowr than old XEON workstations.

    it performs like it should in other apps.

    Does anyone have knowledge about wether LW is written primarily for INTEL and XEON and not optimized for AMD multithreading? I am awaiting response also from LW support.

    best regards
    Mats Andersen
    MIR

  2. #2
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    Quote Originally Posted by Mats Andersen View Post
    Hi guys

    We have aquired two new dual 64thread workstations with AMD 7371 CPUS. It was surprising to see that it does not perform very well in LW 2019.

    When we run 1 thread only it does well, but once we use more than 4 threads tis efficiency drops like a rock making it slowr than old XEON workstations.

    it performs like it should in other apps.

    Does anyone have knowledge about wether LW is written primarily for INTEL and XEON and not optimized for AMD multithreading? I am awaiting response also from LW support.

    best regards
    Mats Andersen
    MIR
    Turns out to be the case only in 2019. in 2018 it performs normally fast as expected. it means somethings has changed from 18 to 19 in terms of AMD compability. Anyt clues?

    Mats

  3. #3
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    There are 1 or 2 threads about threadripper LW compatibility here with some tips. What OS and version are you running?

  4. #4
    My Threadripper PC works as expected with LW 2018 & 2019 but has some weird issues when using LW 2015 that can cause crashes.
    Threadripper 2990WX, X399 MSI MEG Creation, 64GB 2400Mhz RAM, GTX 1070 Ti 8GB

    https://www.dynamicrenderings.com/

  5. #5
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    Quote Originally Posted by Free4Ever View Post
    There are 1 or 2 threads about threadripper LW compatibility here with some tips. What OS and version are you running?
    Hm perhaps teh threadripper is different architecture than the EPYC? its is a dual system. WIN 10 is the OS.

    After further testing it seems difference between 2018 -19 is not relevant. More or less the same when it comes to AMD speed.

    Mats

  6. #6
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    Win 10 1903 had some LW compatibility issues for some, but in general it is the first version with good support for AMD Zen CPUs.
    1P Epyc is a little better than Threadripper with compatibility, but a 2P system may have issues with more apps, since 2P has the general issue of slow communication between the CPUs, that some apps/games freak out about...

  7. #7
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    You can try the free CorePrio utility with the Epyc supporting function NUMA Dis... that helps at least one other rendering app with a weird perf issue. https://bitsum.com/portfolio/coreprio/

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