Apple Metal on intel macOS-12.3 & AMD Radeon Pro 5700 XT iMac crashing/hanging and immense memory usage. #96471

System Information
Operating system: macOS-12.3-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5700 XT OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.8.13

Blender Version
Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash: c77597cd0e
Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-03-14 19:06, hash: fc259d4c30

Short description of error
Switching from solid to rendered viewport OR start rendering ends in hanging blender app.
Same for switching between GPU Supported and Experimental when in solit view.

Just using CPU works normal, but as soon as you switch to GPU or start a render ...

Exact steps for others to reproduce the error
USE : Latest macos 12.3 intel, AMD Radeon Pro 5700 XT, xcode 13.2.
I used here the downloaded blender 3.1.0 and compiled blender 3.2.0 version.

It was tested on factory settings!

EDIT: After leaving the room for a ciggy with hanging blender, it started rendering. Meaning to render Suzanne with a light takes at least several minutes to calculate, then the render starts and ends in a few seconds. Every time you want to render or restart blender.
MEANS: The long calculating (for initialising the graphics card ) takes place every time I start blender PLUS the long calculating time for the scene.

Viewport is the same. Works with the GPU but very slow. Rendering with CPU&GPU doubles the render time.
(Persistant data is switched off but was also tested ON with the same result.)
All in all, every time it calculates the scene first via CPU for a long time, then it renders, what brings the overall rendertime to the same result as rendering only with a CPU on this basic intel iMac setup!!
Also the overall performace of the OS is super laggy / unusable. Means opening a text editor for example, thakes several seconds...

16-March-2022_02.49_02.blend

This file on CPU only rendering:

Reduced RAM from 64 GB to 4.2 GB RAM
Calculation time: 1 min 11 sec
Altogether Render time: 6 min 43 sec

This file on GPU only rendering:

Reduced RAM from 64 GB to 6.7 GB RAM
Calculation time: 18 min 32 sec
Altogether Render time: --- stopped the render after 22 min. AND no Sample was rendered at all !

simple scene:

This shows the CPU and GPU usage when trying to render with GPU only. Calculating only done on CPU.
IF rendering only with CPU the calculating time on the CPU is not that long as you can see above.

the CPU render:

**System Information** Operating system: macOS-12.3-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon Pro 5700 XT OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.8.13 **Blender Version** Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash: `c77597cd0e` Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-03-14 19:06, hash: `fc259d4c30` **Short description of error** Switching from solid to rendered viewport OR start rendering ends in hanging blender app. Same for switching between GPU Supported and Experimental when in solit view. Just using CPU works normal, but as soon as you switch to GPU or start a render ... **Exact steps for others to reproduce the error** USE : **Latest macos 12.3 intel, AMD Radeon Pro 5700 XT,** xcode 13.2. I used here the downloaded blender 3.1.0 and compiled blender 3.2.0 version. It was tested on factory settings! ![Screen Shot 2022-03-15 at 12.02.24 am.jpg](https://archive.blender.org/developer/F12928072/Screen_Shot_2022-03-15_at_12.02.24_am.jpg) ![Screen Shot 2022-03-14 at 11.54.42 pm.jpg](https://archive.blender.org/developer/F12928071/Screen_Shot_2022-03-14_at_11.54.42_pm.jpg) ![Screen Shot 2022-03-14 at 11.54.05 pm.jpg](https://archive.blender.org/developer/F12928070/Screen_Shot_2022-03-14_at_11.54.05_pm.jpg) EDIT: After leaving the room for a ciggy with hanging blender, it started rendering. Meaning to render Suzanne with a light takes at least several minutes to calculate, then the render starts and ends in a few seconds. Every time you want to render or restart blender. MEANS: The long calculating (for initialising the graphics card ) takes place every time I start blender PLUS the long calculating time for the scene. Viewport is the same. Works with the GPU but very slow. Rendering with CPU&GPU doubles the render time. (Persistant data is switched off but was also tested ON with the same result.) All in all, every time it calculates the scene first via CPU for a long time, then it renders, what brings the overall rendertime to the same result as rendering only with a CPU on this basic intel iMac setup!! Also the overall performace of the OS is super laggy / unusable. Means opening a text editor for example, thakes several seconds... [16-March-2022_02.49_02.blend](https://archive.blender.org/developer/F12929409/16-March-2022_02.49_02.blend) This file on CPU only rendering: Reduced RAM from 64 GB to 4.2 GB RAM Calculation time: 1 min 11 sec Altogether Render time: 6 min 43 sec This file on GPU only rendering: Reduced RAM from 64 GB to 6.7 GB RAM Calculation time: 18 min 32 sec Altogether Render time: --- stopped the render after 22 min. AND no Sample was rendered at all ! simple scene: ![Screen Shot-01.jpg](https://archive.blender.org/developer/F12929421/Screen_Shot-01.jpg) This shows the CPU and GPU usage when trying to render with GPU only. Calculating only done on CPU. IF rendering only with CPU the calculating time on the CPU is not that long as you can see above. ![Screen Shot 2022-03-16 at 3.23.50 am.jpg](https://archive.blender.org/developer/F12929420/Screen_Shot_2022-03-16_at_3.23.50_am.jpg) the CPU render: ![Screen Shot 2022-03-16 at 3.45.53 am.jpg](https://archive.blender.org/developer/F12929419/Screen_Shot_2022-03-16_at_3.45.53_am.jpg)

Added subscriber: @Nurb2Kea

Added subscriber: @PratikPB2123

Changed status from 'Needs Triage' to: 'Needs User Info'

Hi, thanks for the report.

Issue is probably same as described in- #96252

Can you check again with latest macOS update

Do you have this issue on previous blender versions? (say 3.0.0, 2,.93LTS)

Does this happen with viewport render or final render?

I use the latest macOS 12.3 already, as of the day of this report when the 12.3 update arrived !
Those versions (say 3.0.0, 2,.93LTS) AREN'T able to, because Metal for Intel Mac's and AMD cards was introduced with blender 3.1, 3.2 etc...

Does this happen with viewport render or final render? Yepp, SEE ABOVE !

All answered already in the report, see above. And slidly different than #96252.

THX

Changed status from 'Needs User Info' to: 'Needs Triage'

Added subscriber: @mano-wii

Changed status from 'Needs Triage' to: 'Needs User Info'

This doesn't seem like a Mac-only issue and I'm not sure if it's a GPU issue.
Here with an AMD with CPU rendering only I experience a crash.

The problem seems to be the fact that the Mesh light object uses Adaptive Subdivision which causes, in the layout used, a very high usage of CPU and memory resources.
While we want to improve Blender to handle such cases memory gracefully, this is not currently considered a bug.

@Nurb2Kea, could you check if the problem is really with the Adaptive Subdivision?

Well Germano Cavalcante, do you except a hug ! :-)

You're right, Adaptive Subdivision and the fact that the meshlight also has a shape key on it, caused the problem. I just switched it off!
Rendering is down to 1min 29sec and only uses 4736.45M.

Haven't heard and had the problem yet, that Adaptive Subdivision and rendering has such a long calculation time on a simple Adaptive Subdivision + shape key.
Most of the times I leave those Adaptive Subdivisions unapplied for later changing and test renders.
(Also wondering how to render those details with Adaptive Subdivision turned OFF ???)

Anyways, solved for me but that should be communicated with all the dev's for a fix.

Changed status from 'Needs User Info' to: 'Archived'

Good to know that we identified the problem.

In #96471#1324970, @Nurb2Kea wrote:
(...)
Anyways, solved for me but that should be communicated with all the dev's for a fix.

A valid report needs to be simple and straightforward about the bug. But the scenario described in this one is not clear and it took a lot of time for me to identify the problem.
(We require the bug reporter to narrow down the problem).

It's also still unclear if it's actually a bug in Adaptive Subdivision + shape key or a limitation in the scenario.

If you think you found a bug, please submit a new report and carefully follow the instructions. Be sure to provide a .blend file simplified and the exact steps to reproduce the problem.

A guideline for making a good bug report can be found at https://wiki.blender.org/wiki/Process/Bug_Reports

It's also good to keep in mind that Adaptive Subdivision hasn't been maintained for a long time, which is one of the reasons it's still experimental.

Still continuing on latest blender version:

System Information
Operating system: macOS-12.3-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5700 XT OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.8.13

Blender Version
Broken: version: 3.2.0 Alpha, branch: master, commit date: 2022-03-31 17:14, hash: 42853bacc9

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Apple Metal on intel macOS-12.3 & AMD Radeon Pro 5700 XT iMac crashing/hanging and immense memory usage. #96471