Shader stuttering and PSOs

[grand parcel]

https://youtu.be/ibIFKEYyBYo

EPIC recently talked about shader stuttering and how developers can solve it, including some recent changes they made to make it easier. Eventually I hope they fully automated most if not all of this process but for now here is how you gather, expand, and then cook PSOs.

https://www.unrealengine.com/en-US/tech-blog/game-engines-and-shader-stuttering-unreal-engines-solution-to-the-problem

https://dev.epicgames.com/documentation/en-us/unreal-engine/manually-creating-bundled-pso-caches-in-unreal-engine

[atomic knoll]

Idk why stat psoprecache doesn't recognize

ow this work: stat PipelineStateCache

but it's different (

[ornate flume]

Having issues getting it to convert to an .spc on 5.4.4

[grand parcel]

hmmm it should work I used 5.5.3 but it should work on anything after like 5.3 I think what error do you get?

[grand parcel]

I think you have an extra quote in there breaking it

or are missing one

something seems a bit off here

my full command looks more like this
D:\UE_5.5\Engine\Binaries\Win64\UnrealEditor-Cmd.exe -run=ShaderPipelineCacheTools expand

"C:\Users\Spacemarine658\Desktop\PSOCache*.rec.upipelinecache"

"C:\Users\Spacemarine658\Desktop\PSOCache*.shk"

"C:\Users\Spacemarine658\Desktop\PSOCache\PSO_StarlightBrigade_PCD3D_SM6.spc"

[ornate flume]

I was tyring to pass the full path because I was having issues. I will try again with just the project name.

@echo off

cd "D:\AsISurvive\Nick_Development\AIS\LocalBuilds\Windows"

START D:\AsISurvive\Nick_Development\AIS\LocalBuilds\Windows\AIS.exe -clearPSODriverCache -logPSO

FYI I had to run my bat like this as well to get it to launch with those switches.

Progress. Just need to fix these warnings I guess and it should actually generate the file then.

[grand parcel]

I think so 🤘

[elder glade]

Hey, i stumbled upon this thread when looking for answers since im having some difficulties setting up PSO bundled cache for Quest in UE 5.5. I had previously done the PSO caching in 5.3 and it worked just fine but on 5.5 its just not generating any rec.pipelinecache files when launching with -logPSO. I was also able to get the logging to work properly on the same project when i built for Windows.
Have you tried PSO logging for Quest in UE5.5 and if you have what were the results?

[grand parcel]

Sorry but I have not you might be able to try one of the VR channels for help

[ornate flume]

Path to correct engine version?

[elder glade]

The issue isn't with generating a .spc its getting the headset to create a .rec.pipelinecache file. I was able to do the process just five on windows though

[cobalt whale]

[Unreal 5.6] I am trying to package a PSOs bundle with my game, but so far even though the messages from the log shows that the said loading from the bundle is successful, there is still stuttering if I use -clearPSODriverCache to make sure that there are no already precached PSOs from previous runs. From the log, it seems that the PSOs bundle is first loaded and then the cache is cleared which I am not sure if it means that it creates the PSO based on the bundle instructions and then clears them afterward which it would be stupid in my opinion since as far as I have read the -clearPSODriverCache is for clearing all previous PSOs in order to see if you missed any in you bundle. I would appreciate any help regarding this.

There seem to be 3 spikes in my project, 2 being the loading of 2 levels and the other is for a trigger when I spawn a niagra explosion vfx, I recorded the psos for the bundle on all scalabilities from 0-4 just in case and made sure to cover the entire PSOs that could be encountered in that specific level since its just a third person template level over which I added something like a car that explodes, so nothing fancy and default settings project wise, but those 3 spikes continue to persist if I clear the cache. Again, at this point I have no clue if I am doing something wrong or misinterpreting something.