4.12p3 Extreme Editor Performance/Memory Issue w/ Planar Reflections

anonymous_user_0df12f74
Tue, 10 May 2016 19:56:23 +0000
Rendering

Hey guys,

This is difficult to explain so I created a video showing the problem. In the video I added an overlay with my GPU data view and Task Manager view so you can see exactly what is going on.

Adjusting any slider value on my ocean blueprint causes the editor to slow down by 80+% and start eating up RAM at an alarming rate (15gb in roughly 60 seconds) until I let go of the slider and wait ~5 sec for performance to return to normal.

I have not had any crashes yet, when it gets up to the 24gb RAM limit of my machine, Windows starts offloading it to compressed memory (or disk). Judging by the GPU data, it appears to be offloading VRAM to RAM once it hits my GTX980’s 4gb limit.

Click here to view the video

After trying to track down the culprit, I was able to reproduce this in a brand new project. Below are the steps to reproduce:

1. Create new Blueprint First Person project (likely any type will work though)

2. Go to Project Settings → Rendering and enable “Support Global clip plane for Planar Reflections” under the Optimizations section.

3. Restart the editor

4. once it loads open the “SkySphereBlueprint” and add a “Planar Reflection” component, then compile and go back to the main screen.

5. With the SkySphere blueprint selected, try adjusting any of the sliders in the details panel, such as Cloud Opacity, and keep sliding it back and forth for 5+ seconds, you should see you VRAM and RAM usage spike and continue to grow, as well as editor performance drop significantly until you release the slider and wait another ~5 sec.

I’ll continue to look into this on my end, hope that is enough info to get you started.

Let me know if you need any other info (my DXDiag is below).

The video above is Preview 3, but this issue was also present in Preview 2 (did not use preview 1).

link text

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