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V-Ray's "Low GPU Thread Priority" doesn't seem to be working correctly

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  • V-Ray's "Low GPU Thread Priority" doesn't seem to be working correctly

    I just added a second card to my system and wanted to test V-Ray's "Low GPU Thread Priority". It doesn't appear to be working as advertised. As far as I understand, it's only meant to slow down the gpu plugged into the monitor.

    I ran some quick benchmarks using RT GPU in MODO.

    Code:
    Monitor 1: 670
    Monitor 2: 670
    Nvidia Control panel: CUDA = ALL, OPENGL = 670
    
    1080ti                      0m57.8s
    1080ti + CPU                0m53.1s
    1080ti + 670                0m44.6s
    1080ti + 670 + CPU          0m42.2s
    1080ti + 670 + CPU + LP     1m59.8s
    The last benchmark with low GPU priority (LP) should be about the same as "1080ti + CPU", but its slower than everything. In this setup, only the 670 (plugged into monitor) should be slowing down.


    EDIT: And before anyone mentions it... I obviously wouldn't render with this setup because I'd limit everything to the 670's 2GB of VRAM. I'm just pointing out the problem in the "low gpu priority" feature
    Last edited by 1funk; 27-04-2018, 08:27 AM.
    Win10 Pro 64 / AMD Ryzen 9 5950X / 128GB / RTX 3090 + 1080 Ti / MODO
    I am the resurrection, and the life: he that believeth in me, though he were dead, yet shall he live - Jesus Christ

  • #2
    Hey, Funk,

    Thank you for the feedback. I am able to reproduce the behavior with V-Ray for Modo 3.60.01, so I'm going to log it. Keep you posted on it.

    Cheers,
    Boyan Nalchadjiiski | QA Engineer @ Chaos |
    E-mail: boyan.nalchadjiiski@chaos.com

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