Blender increases ram usage until its too laggy to use after a few minutes of use. #87147
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Reference: blender/blender#87147
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System Information
Lenovo Yoga 7i
intel evo i5 11th gen
Operating system: windows 10 home
Graphics card: Intel Iris Xe
Blender Version
Broken: version 2.91, 2.92, 2.93.0
when I start running blender it works perfectly for a few minutes but over time it starts taking so much ram. I have 12gb of ram and it usually gets up to 40% ram usage before I have to restart it. it only takes a few minutes and it becomes basically unusable without a restart. I'm primarily working with 2d animation, I've noticed that with sculpting mode it works fine but once I open 2d animation it starts eating all my ram again.
Exact steps for others to reproduce the error
I have no idea how to reproduce the error, it just happens every time i use blender
blender_debug_output.txt
messinaround.blend1
Added subscriber: @ImaRealBoi
Added subscriber: @filedescriptor
Changed status from 'Needs Triage' to: 'Needs User Info'
This might be a memory leak in Grease Pencil somewhere. Can you try and use the 2D animation template to increase the RAM usage once more? You can use the
blender_debug_log.cmdin the Blender installation directory to create a log file. After Blender becomes slow, save the file then exit. Then upload both the log file and the.blendfile here (e.g. via drag & drop).i hope this is the right thing
blender_debug_output.txt
messinaround.blend1
Changed status from 'Needs User Info' to: 'Needs Triage'
Added subscriber: @mano-wii
Changed status from 'Needs Triage' to: 'Needs User Info'
Even after opening the attached file and drawing in different frames, I cannot replicate the problem.
RAM remains stable at 33% usage.
Unfortunately this can't be triaged as a complete bug report as there needs to be reproducible steps to the development team to be able to help (start blender, press this, then that).
Please try the latest daily build: https://builder.blender.org/download/
Go to File → Defaults → Load Factory Settings and then load your file to see if you still can reproduce this issue.
If the problem persists, please give us more clear instructions on how to reproduce it from scratch.
Remind to use
Help -> Report a Bugin Blender so there is complete information about the Blender version and graphics cards.Optionally you could provide the
system-info.txtgenerated inHelp -> Save System Infoi really dont know how to reproduce this error because it just happens every time i use blender. for me its just open blender> start drawing> a few minutes later its lagging
also I've attached a link to a screen recording that shows what happens and also my system info.
https://youtu.be/Ta4yEdoNwLU
system-info.txt
Changed status from 'Needs User Info' to: 'Needs Triage'
Added subscriber: @Harley
One suggestion is to not rely on Memory % for your testing. That of course will go up if any of your other apps use less memory. Just right-click on that column header in Task Manager, Resource Values, Memory, Values. Then it will show you an actual amount of RAM being used rather than percentage.
Added subscriber: @AquilaTheEagle
Even with the latest 2.93 build, this problem is continuing.
It has nothing to do with images. I was able to repeat it again just with the 2D animation template, and with simply 1 grease-pencil object (files attached).
I wrote and drew a little in Grease-Pencil (everything behaved perfectly for the first hour), then let the file sit open overnight. In the morning, it was significantly slower for everything I tried. Drawing, moving, undoing, and playing the timeline were all really sluggish. There were no keyframes, and very little in the blender file overall. Then I opened another instance of Blender 2.93, and copied the GP object from the Laggy file over to it. Everything on this second instance was perfect.
I simply copied the objects from the first "laggy" blender into the second freshly-opened blender.
** Please watch the video so you can see that the same exact version of Blender, opened side-by-side, but with one set of GP drawings "sitting out" for 20 hours, and then other for a few minutes give a completely different response.
2d Anim 20 hours.blend
2d Anim 10 minutes.blend
Blender Lag.wmv
To replicate this, simply make a new 2D animation, draw in it a bit, then let it sit overnight. Measure the playback speed the next day. Not sure if it matters, but I am using a Wacom tablet to draw in GP.
I have disabled a bunch of add-ons and reset the 2D animation to the default Startup File / Factory settings. I also turned off some background processes I found running on my PC to try and address this. Unfortunately, it still isn't helping. I use grease pencil almost every day, but it is only usable for a short (but variable) amount of time then it gets very laggy and I have to restart Blender.
An interesting new variation that may help you track it down . . if I simply OPEN blender on the 2D animation page, then just let it sit for between 5 minutes and several hours, this will happen. Opening up a second instance of Blender, that one will behave normally. You can both feel this when you try and draw, but you can see it with the frame rate when running an (empty) animation.
This is with the latest official release of 2.93.0 (from 6/2/2021). In the most recent occurrence, Blender Grease Pencil behaved normally for about 3 hours, then suddenly got worse (~3x slower drawing, undo, and playback of the timeline . . which had no keyframes). Restarting instantly fixed everything, and that is the 20210606 GP Lag.blend that is attached.
I really love using Blender GP, but it is really tough to use when it suddenly becomes extremely laggy. Thanks for looking into this still.
I tried blender on a different laptop
( MSI
Windows 10 home
Intel Core i7-1165G7
intel iris Xe graphics
8gb of ram )
and it works perfectly fine on that computer so I still cant figure out how to actually recreate the problem
on one computer its just Open blender > wait 10 minutes > then becomes too slow to use
but on the other it still works perfect (both on factory default settings)
Few other points >
Doesn't have to be 2D animation template. Today I used the standard template and drew - started out great, then got really slow (and frame rate dropped). I checked Window's Paint, and it behaved normally, so it isn't something about the pen driver, it is specific to Blender. I also don't think it is a memory issue, at least for me, since Blender wasn't using tons of memory.
Added subscriber: @SnarkBucham
Hello, I have the same problem with the latest versions of blender. My laptop is a hp Intel (R) Core (TM) i7-8565U CPU @ 1.80GHz 1.99 GHz with 16 gb of ram. UHD 620 integrated graphic card. In my case, the same happens after a period of use. But also in other modes besides grease pencil mode. Even with very few vertices (for example a couple of cubes divided a few times). At first everything is fine but after a while, selecting anything takes blender up to two seconds to select an object or a vertex. Looking at the task manager I have noticed that the lag begins to be noticed when it starts using more than 1.5GB approximately (it is not something exact and I do not know if it is the reason). It's strange because I haven't even reached 50 percent ram usage there. It also surprises me, that if I have a new file, and I look at the task manager, the ram remains practically the same (sometimes it drops 100 or 150 mb) and the problem persists. I always have to close blender and reopen it, to be able to continue with the project, in this case the ram is again between 500 and 900mb and I can go back to working for a while until the same thing happens again. I also tried to lower the undo steaps to 5 but the same thing happens to me. Greetings and thanks for your attention.
I have also tried with the latest Blender 3.0 daily download (7/24 version). Factory settings on blender, and other cpu/memory hogs on the computer closed (like Chrome and Dropbox). Blender works great for about 5-10 minutes, then becomes unusable. Like Felix reported, opening/closing the file does not solve the problem, but restarting the entire program does bring things back to normal (for a few minutes).
Changed status from 'Needs Triage' to: 'Needs User Info'
With so many comments, I don't know where to look in order to try to replicate the bug.
I suggest creating a new bug report with minimal steps to replicate the problem.
Hello. I've been trying to find a way to reproduce the bug, but I can't find anything specific that reproduces it. I just use blender to model, sculpt or draw with grease pencil and in less than 10-15 minutes at most blender starts to slow down. Even with a grease pencil object of less than 19,000 vertices with nothing else. I can only indicate the following. It usually starts when 1,700 mb of ram is reached. But it happens sometimes with even 1400. Usually at 40-50 of the ram capacity of the computer. But I don't even know if that's a cause or a consequence. At some point krita reaches 3000, the task manager shows me that the used memory reaches almost 60, and if I open blender again at that time it works correctly. So I don't know if the memory or the fact that it doesn't go down until the program is restarted has something to do with it. What I have noticed is that with krita using 2,500 mb and almost 50%, I open blender and it works perfectly, after a short space of time, when the memory has gone up a bit and it starts to jerk, the use of my ram is at 60% (something that I don't usually get to), I open another blender window (2.9 or 3.0), at the same time, and in this one everything works perfectly. I switch to the other window and everything is very laggy (drawing, modeling, pressing buttons, sculpting, selecting), even when I drag the window across the desktop (all other windows move fine across the desktop at this point, even the new instance from blender). Even in this situation, if I open the same test project as the first one in the second, it still works correctly (just like the first instance would if I restarted it). It's pretty weird. I don't know if this will clarify something. Thank you for your attention and best regards.
Hello again. Today I have been using blender after leaving it yesterday without closing, and it worked badly only using 800 mb and at 44% of the maximum ram. I have opened another instance at the same time and it was still working fine after taking it to 1200mb. The first instance was malfunctioning at all times. Maybe the ram you need and use blender has nothing to do with the issue. If you can think of something I can do to check something, please ask me. Thanks and best regards.
Added subscriber: @antoniov
Thanks for the info, but I'm not sure how we can help here without having access to hardware and possible tools that the developer prefers.
Developers are always on the lookout for memory issues and constantly monitor memory usage during development.
Try to test with the latest builds, and make sure your computer's drivers are up to date. (maybe the problem is not directly related to Blender)
The crash-log shows a curious information related to GPencil:
@antoniov, any idea what this is, or if it might cause some memory leaks or any other cause of slowdowns?
This is due these lines:
printf("GPencil - Starting Drawing\n");
}```
@mano-wii I'm going to do a cleanup of these old printf
Cleanup done:
871f7f4ad8Added subscriber: @iss
I suspect this could be caused by GPU drivers, same issue as #89097, possibly #86342 too.
There is way to check if this is the case by using software opengl emulation:
From https://github.com/pal1000/mesa-dist-win/releases/tag/21.1.1 download file mesa3d-21.1.1-release-msvc.7z.
Then extract files opengl32.dll and libglapi.dll to folder where blender.exe is located.
These libraries will make Blender much slower so you probably don't want to use them long term.
Does using software opengl emulation help (as in memory usage doesn't increase over time as much)?
To double check if .dll files are used correctly, please click on Help > Save System Info and upload file here.
@iss Thanks for this note! I tried this last week and this week but having a different problem. When I try to download that file (mesa3d . . msvc.7z) it tells me that it has a virus and won't let me use it. I tried this with both Chrome and Edge, they both won't let me download it. Not sure if the 21.2.3 version of Mesa will also work, it appears to allow me to download this one . .
mesa3d-21.2.3-release-msvc.7z
I will try it out, but just wanted to get you an update . .
Unzipped "mesa3d-21.2.3-release-msvc.7z" and used the 2 files in the x64 folder (opengl32.dll and libglapi.dll) in the same folder as my Blender 3.0 alpha blender.exe file. Save System Info is attached system-info mesa.txt. I notice a huge performance difference, so I think it is using those files. Every time I draw now the CPU usage goes up to ~100%, so I have to draw for a second, then wait for it to update, then continue (a very slow process).
(before using mesa . . ) I don't tend to see a large memory usage when my lagging error occurs, but usually find that after a few minutes with Grease Pencil it becomes really laggy until restart. A quick way that I can measure this is to check the FPS when I press play (no animation by the way). When I start working, it is near 25 fps, but then 5 minutes into drawing the fps drops below 15, sometimes as low as 5 fps. After restarting it is back to 25 fps.
With the mesa graphics, the FPS starts at 1 FPS, so I don't think I will be able to see it drop. I used it for 30 minutes, and couldn't detect a change, but again, it is starting so slow that I don't think I can notice anything worse. I also monitored the memory, and it didn't change at all. Is there any other way to test it that doesn't make blender so very slow from the start?
@AquilaTheEagle
Thanks for checking, and sorry for late response. Yes unfortunately these libraries will be much slower than using native graphics hardware.
In your case this may be different bug than what is being reported here, since OP said in description mentioned RAM usage being high.
You have to check with Windows task manager, not Blender status bar, as this is not memory used by Blender directly. Can you double check if you see no excessive memory usage without mesa libs?
Thanks for following up. I will try and record a video both with and without the Mesa driver so you can get more of the details of the memory usage, etc. I tried the latest 3.0 alpha release and unfortunately I still am getting the same lagging issue as before. I do see a memory increase for blender (from Task Manager), but not enough that it gives me pause. I will share so we can decide if it is exactly the same issue.
The version of mesa they linked won't download for me as well because it says there's a virus. Can I have a link to the version that worked for you? I have the ram problem and I'll test it. I'm using blender 2.93.0 right now, I can switch to 3.0 alpha for testing if its better.
(edit: typo)
This comment was removed by @ImaRealBoi
I don't use AV software, so it worked for me. You can check other (probably more recent) versions, or disable antivirus for test. It is stated on their bugtracker, that they can't prevent false positive detection. It's fairly trustworthy source IMO.
Audrey, here is the link I used:
https://github.com/pal1000/mesa-dist-win/releases/download/21.2.4/mesa3d-21.2.4-release-msvc.7z
Also, I posted a video with details about my issue over here: https://developer.blender.org/T86342
Added subscriber: @carl.e.henderson
I am having issue with the Iris Xe graphics driver as well. It is version 27.20.100.9749. Is there more information I can provide?
Added subscriber: @Jonathan-Monsonego
Added subscriber: @Jako
I also have this issue. I am also on Intel UHD graphics version 27.20.100.9749.
To my knowledge, I've only found one person who's documented this bug in video form, here in this video: https://www.youtube.com/watch?v=s1IUHG0N32o
While their method for fixing it doesn't work, they do show exactly what the problem entails and reproduces it on video.
If you try to reproduce it, you must do it with an Intel integrated GPU, as this seems to be limited to just that hardware.
Added subscriber: @afeso
I'm experiencing a similar issue albeit with the VSE, and recently, while sculpting. This wasn't present in the beta build of blender, but its been happening since the official release.
I summited a bug report here: https://developer.blender.org/T94020
We have identified an issue with Intel Iris drivers, and the developers have already been notified.
See #86778 (Viewport Slowdown on 11th gen Intel Xe graphics).
I believe this is the same problem here. So I will merge the reports.
Thanks for the report.
Closed as duplicate of #86778