LWRP constantly creating several KB of garbage per frame

So I was profiling a test project and noticed GC Allocs on "RenderPipelineManager.DoRenderLoop_Internal()"

Just to be sure I created a new LWRP project (Unity 2019.1.5) and just run the Sample Scene. And yes, I'm having 3.6 KB of garbage generated every frame.

Furthermore "ScriptableRuntimeReflectionSystemWrapper.Internal_ScriptableRuntimeReflectionSystemWrapper_TickRealtimeProbes()" is generating 40 B per frame.

And sure enough, spikes ocur every now and then... Again, this is a brand new project, running the Sample Scene.

I assume this is a bug of LWRP? For something that is "production ready" this seems like an issue...

 

Here's a screenshot of the profiler:



As you can see it's definetly a LWRP problem. It doesn't seem to be much, but just in a few seconds you end up with MB of garbage which will prompt the GC collector and stuttering

 

Can confirm, this is a headache.

 

I'm finding this too. only 1.5kb but its enough to cause stutters in webgl

 

What version of SRP and LWRP are you using?

 

I think they fixed this in LWRP 7.0+ version, mostly.

 

Looks like this is back in URP 7.1.8 and now does 251.7kb per frame, consistently.

 

With URP 7.2.1, in the URP sample scene, adding a 2D renderer, setting the main camera to use it and adding a single 2D point light causes about 36B to be allocated per frame. It seems the more lights, the more garbage is created.

I didn't change any materials to use Sprite-Lit-Default.

This causes noticeable spikes when running a 2D game with 2D lighting.

Edit: Running Unity 2020.1.0a23 for this test, but it also happens using 2019.3.2f1.
Overall, performance is quite a bit better in 0a23 though.

 

running 2019.3.6f1 and I have the same issue. I have URP 7.1.8.