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JoeriCG
New Participant
May 11, 2022

Get GPU frametime on Quest

I'm trying to implement Unity's Dynamic Resolution as a quick fix for the remaining GPU-bound scenarios in our game, but I'm running into the issue that I can't seem to get the last GPU frametime no matter what API I use. Neither FrameTimingManager.GetLatestTimings, XRStats.TryGetGPUTimeLastFrame, nor XRDisplaySubsystem.TryGetAppGPUTimeLastFrame seem to work on my Quest 2 (but do in-editor via Link). What is the preferred method to get the GPU frametime on Quest?

 

To clarify, the game is using Vulkan and the VRAPI (not OpenXR).

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      2 replies

      lordzargon
      New Participant
      October 17, 2022

      I'm having this exact issue. Did you ever find a solution? I've tried no less than 6 different API calls to try and get this information, yet they all fail or return 0.

      lordzargon
      New Participant
      October 18, 2022

      I got it. 

      You need this in your Start/Awake function (or whenever you want to start tracking the GPU App time)

       

      void OnEnable()
{
    Unity.XR.Oculus.Stats.PerfMetrics.EnablePerfMetrics(true);
}

void OnDisable()
{
    Unity.XR.Oculus.Stats.PerfMetrics.EnablePerfMetrics(false);
}

       

       

      Then, in your Update...

       

      float appGPUTime = Unity.XR.Oculus.Stats.PerfMetrics.AppGPUTime;

       

       

      That got it for me.

      Hope that helps!

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