PSO Disk Cache Activation Issue

Development Rendering
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1

Hello Epic Games Support Team,

I am reaching out regarding an issue I have encountered while working with Unreal Engine 5.6 (Launcher version on Windows 11 with DirectX 12).

I did configuration of the project settings for enabling PSO disk caching. Bellow I am sharing the settings I added to the project.

DefaultEngine.ini

r.PSOPrecaching=1

r.PSOPrecache.Validation=2

r.PSOPrecache.Validation.TrackMinimalPSOs=1

r.ShaderPipelineCache.StartupMode=3

r.ShaderPipelineCache.Enabled=1

r.PSOPrecache.ProxyCreationWhenPSOReady=1

r.PSOPrecache.LogCollection=1

r.ShaderPipelineCache.ReportPSO=1

r.ShaderPipelineCache.ExcludePrecachePSO=1

r.ShaderPipelineCache.SaveUserCache=1

r.ShaderPipelineCache.GameFileMaskEnabled=1

DefaultGame.ini

[/Script/UnrealEd.ProjectPackagingSettings]

bShareMaterialShaderCode=True

bSharedMaterialNativeLibraries=True

(I used the following resource as a setup guide - https://www.tomlooman.com/psocaching\-unreal\-engine/)

Unfortunately after doing setup according the guide, I was not able to make this working. Bellow sharing the log.

LogD3D12RHI: Display: Not using pipeline state disk cache per r.D3D12.PSO.DiskCache=0

LogD3D12RHI: Display: Not using driver-optimized pipeline state disk cache per r.D3D12.PSO.DriverOptimizedDiskCache=0

I use the following command for running the build.

.\NEWProject56.exe -dx12 -logPSO -trace=default -clearPSODriverCache -execcmds=“stat PSOPrecache” -execcmds=“stat unitgraph”

Additional information:

  • I verified that the .upipelinecache and the .bin folders are writable.
  • I set NeedsShaderStableKeys=true before packaging.
  • I tried to make it working on a default unreal engine project.(same result)
  • I been using PSOPrecache and Blueprint node NumPrecompilingPSOsRemaining to test collection runtime — no persistent caching is being recorded.

Thanks for your time. Any support will be appreciated.

2

Hello,

Thank you for reaching out.

I’ve been assigned this issue, and we will be looking into the PSO Precaching and Bundled PSO behavior for you.

3

Hello,

The log messages you included are from an older system that has been disabled since 2018. (See CL: 4567513 on //UE4/Dev-Main)

To test the effectiveness of your Bundled PSO and/or PSO Precaching setup you can do the following:

  1. You can use Unreal Insights before and after to compare hitching (as suggested in the guide you linked)
  2. You can run with the command-line arguments “-logpso -clearPSODriverCache” and observe the new PSO logs
  3. You can use the console command “stat psoprecache” to measure the PSO Precaching stats.

Please let us know if this helps.

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