I’ve been running into this issue with a specific project where after it being open for about 30 minutes or so suddenly the Editor will start consuming near 100% of all my system’s RAM. Causing my computer to freeze and crash.
I have 128gigs of RAM so this should not be happening. It’s very sudden too. My system will go from maybe around 10-20% of memory usage to suddenly 90-100% memory usage. This happens even with just an empty third person character map open, or even with the editor minimized.
I’ve been trying to figure out the source of this issue for a while now to no avail. Previously I thought it was VRAM on my 4090 being maxed out because I would get error messages such as:
Fatal error: [File:D:\build++UE5\Sync\Engine\Source\Runtime\D3D12RHI\Private\D3D12CommandList.cpp] [Line: 773] out of video memory trying to allocate a rendering resource
Just not sure what to do at this point. It happens like clockwork after some amount of time just simply having the specific project open, not even doing anything. Like something times out and then forces the editor to eat all system memory.
If I test it with a new empty project this doesn’t happen.
Crashed again today while idle. Wasn’t even at my computer. It says out of video memory however that is not the case. The editor randomly decides to start consuming 100% of system memory causing the crash. No idea why
UE Editor in general is pretty infamous for memory leaks, especially for slightly more complex project. Would be hard to pin point the reason for it for your project, however, I generally expereince this with following examples:
If I am using Fluid sims particle (or any complicated particle) is running in the background
If I have animation window open with a complex skeletal mesh
If I have construction scripts with complicated spawn/delete
I generally work with “Real Time” set to off. Most of the time for me its some type of garbage collection issue.
I never used to have this issue before. Now it’s become a regular thing with the same project. It could be an issue with 5.5 but not sure.
In my project I’m not using any of the things you mentioned so it can’t be that. And it happens even with nothing but an empty third person character map open.
It does seem to be some type of memory leak just not sure how to pinpoint it and fix it. There’s no reason for the editor to suddenly start consuming 128gigs of RAM. And it appears to happen almost randomly at any point after the project is open. Usually anywhere from around 30 minutes to an hour+.
It’s really frustrating and prevents me from getting anything done with the constant fear of crashing at any moment.
You could try recording a session of unreal insights and see if that narrows down the leak. Try keeping the task bar open to catch it before your memory is full & stop the insights recording near the peak and then open it for analysis.
It can record editor information as well. So you would just need to check what is consuming most of the memory.
I did try doing that but before I could figure out the issue I got a message about being out of memory and that insight could not continue due to no memory then crash.
I constantly have task manager open now to monitor the memory usage when Unreal is open but it will go from completely normal 10-20% memory usage to suddenly 90-100% memory usage. And by the time it reaches that point my whole computer is freezing and becoming unresponsive, then crash.
Can you try to increase your page file size to counteract the maxing out of memory usage? Perhaps it’s just a memory spike during actor creation / allocation that could be alleviated through a buffer?
Yup tried that already, didn’t help. The spike happens even when not doing anything. I’ve even just opened the project as a test and walked away from the computer for a while, when I came back it was crashed.
You could try turning off unneeded plugins. Narrowing down the editor to min specs. Turning off udp messaging and other non critical plugins. Maybe they are leaking memory.
