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Unity Player 80% CPU Usage

Discussion in 'Editor & General Support' started by hgokturk, Mar 19, 2020.

  1. hgokturk

    hgokturk

    Joined:
    Jun 29, 2016
    Posts:
    17
    Hey,
    Using Mac 10.15.3 & Unity 2019.3.5f1
    In a very simple scene which runs about 900 fps in Windows machine (16gb ram, i7), in my Mac it goes up to 100% usage of CPU, average 80%.
    Mac specs % profiler ss is here:
    https://imgur.com/a/8qtCfDF

    fps is set to 60.
     
    hgokturk, Mar 19, 2020
    #1

  2. MartinTilo

    MartinTilo

    Unity Technologies

    Joined:
    Aug 16, 2017
    Posts:
    2,160
    Looks like you'd be hitting those 60 fps if rendering the profiler window wasn't so expensive (those spikes) and if you where running this in a standalone build. The Editor is waiting for target FPS/vSync differently than a built Player, so you should be checking this there.
     
    MartinTilo, Mar 19, 2020
    #2

  3. hgokturk

    hgokturk

    Joined:
    Jun 29, 2016
    Posts:
    17
    i am hitting more than 60 fps. the problem is it takes more than 80% of CPU which isn't a normal scenario i guess.
    by the way i'm not following you. what is your recommendation?
     
    hgokturk, Mar 19, 2020
    #3

  4. MartinTilo

    MartinTilo

    Unity Technologies

    Joined:
    Aug 16, 2017
    Posts:
    2,160
    Make a build and profile that, see if it behaves the same.
     
    MartinTilo, Mar 19, 2020
    #4

  5. hgokturk

    hgokturk

    Joined:
    Jun 29, 2016
    Posts:
    17
    iPhone 6s Plus seems to run ok with ~50% CPU usage. Anyway, what causes Mac CPU load?:rolleyes:
     
    hgokturk, Mar 26, 2020
    #5

  6. MartinTilo

    MartinTilo

    Unity Technologies

    Joined:
    Aug 16, 2017
    Posts:
    2,160
    I think on windows, waiting for the target fps in the editor actually means the thread is idling while waiting for a Semaphore.WaitForSignal. From the Profiler screenshot, it looks like the Mac doesn't do that Semaphore.WaitForSignal so I assume its waiting for the target fps while the main thread is still keeping the CPU busy.
     
    MartinTilo, Mar 27, 2020
    #6

  7. hgokturk

    hgokturk

    Joined:
    Jun 29, 2016
    Posts:
    17
    I see. Seems like there's no way to fix this issue. Then developing on Mac is pointless when i can get about 600fps on Windows.
     
    hgokturk, Mar 30, 2020
    #7

  8. MartinTilo

    MartinTilo

    Unity Technologies

    Joined:
    Aug 16, 2017
    Posts:
    2,160
    If you're setting Application.targetFrameRate = 60 you should get 60 on Windows as well. Same with setting QualitySettings.vSyncCount =1 or the vSync toggle in the game view's resolution drop-down
     
    MartinTilo, Mar 30, 2020
    #8