Memory spike after setting domain resolution #89586

New Issue

Anže · 2021-07-01T20:19:10+02:00

Anže commented

2021-07-01 20:19:10 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.11

Blender Version
Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: 1b8d33b18c

Short description of error
I'm not sure if this is a bug or something that needs to happen but when you change the resolution of your domain it throttles the memory and goes back to normal.
Here is the video:
2021-07-01 20-04-07.mp4

Exact steps for others to reproduce the error
Add a fluid modifier to a cube and change the domain resolution. I also set the cache type to resumable and modular.
The blend file of my scene:
RAM_spike.blend

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.11 **Blender Version** Broken: version: 2.93.1, branch: master, commit date: 2021-06-22 05:57, hash: `1b8d33b18c` **Short description of error** I'm not sure if this is a bug or something that needs to happen but when you change the resolution of your domain it throttles the memory and goes back to normal. Here is the video: [2021-07-01 20-04-07.mp4](https://archive.blender.org/developer/F10208129/2021-07-01_20-04-07.mp4) **Exact steps for others to reproduce the error** Add a fluid modifier to a cube and change the domain resolution. I also set the cache type to resumable and modular. The blend file of my scene: [RAM_spike.blend](https://archive.blender.org/developer/F10208133/RAM_spike.blend)

Anže commented

2021-07-01 20:19:10 +02:00

Added subscriber: @koko_ze

hal9000 commented

2021-07-01 21:30:02 +02:00

Added subscriber: @hal9000

hal9000 commented

2021-07-01 23:23:28 +02:00

Hi there,

I have just followed your instructions and can confirm this behaviour on my setup.

I have experienced this issue many times with multiple versions of Blender (2.92+) and multiple 'high resolution' simulations (>= about 150). Since there is no apparent change of the mesh and/or the particle systems when changing the resolution as described and probably nothing is simulated, I am surprised to see this memory spike.

A similar spike appears when I change the frame in a previously baked simulation of high resoution. Here the memory usage drops quickly from 100% to a few GB soon after the mesh is updated - e.g. during rendering. My status bar in Blender never showed a memory usage of more than a few GB. But this number may not be accurate with respect to the total memory consumed - e.g. may only show the usage for meshes and textures and not the siumlation data or is not updated because the program lags too much during this process. (In your case it showed me only 19MB the entire time.)

It looks like almost the entire available memory is reserved by Blender no matter how large the installed RAM is (needs confirmation). The entire 64GB are clearly not needed if my 32GB do not cause a crash.

I too would be interested to know the cause of this spike.

Best regards!

EDIT: My Setup:
System Information:
Operating system: Windows 10 Home (10.0.19042)
Blender Version:
Working: 3.0.0-alpha+master.17a67bf778b8

Hi there, I have just followed your instructions and **can confirm this behaviour on my setup**. I have experienced this issue many times with multiple versions of Blender (2.92+) and multiple 'high resolution' simulations (>= about 150). Since there is no apparent change of the mesh and/or the particle systems when changing the resolution as described and probably nothing is simulated, I am surprised to see this memory spike. A similar spike appears when I change the frame in a previously baked simulation of high resoution. Here the memory usage drops quickly from 100% to a few GB soon after the mesh is updated - e.g. during rendering. My **status bar** in Blender never showed a **memory usage** of more than a few GB. But this number may not be accurate with respect to the total memory consumed - e.g. may only show the usage for meshes and textures and not the siumlation data or is not updated because the program lags too much during this process. (In your case it showed me **only 19MB** the entire time.) It **looks like almost the entire available memory is reserved** by Blender no matter how large the installed RAM is (needs confirmation). The entire 64GB are clearly not needed if my 32GB do not cause a crash. **I too would be interested to know the cause of this spike.** Best regards! EDIT: My Setup: System Information: Operating system: Windows 10 Home (10.0.19042) Blender Version: Working: 3.0.0-alpha+master.17a67bf778b8

Richard Antalik commented

2021-07-08 07:07:19 +02:00

Added subscribers: @sebbas, @iss

Richard Antalik commented

2021-07-08 07:07:19 +02:00

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

Richard Antalik commented

2021-07-08 07:07:19 +02:00

I don't think this is a bug because 800 divisions is really huge resolution, so I would expect this to use a lot of memory

@sebbas Can you confirm this?

I don't think this is a bug because 800 divisions is really huge resolution, so I would expect this to use a lot of memory @sebbas Can you confirm this?

Richard Antalik commented

2021-08-09 04:03:57 +02:00

Changed status from 'Needs User Info' to: 'Needs Developer To Reproduce'

Richard Antalik commented

2021-08-09 04:03:57 +02:00

Noticed I set incorrect tag...

Philipp Oeser commented

2023-02-14 12:34:53 +01:00

If we move this out of the triaging queue (by changing status label to Needs Information from Developers), this needs to be the responsibility of a module (so a Module label must be added)

If we move this out of the triaging queue (by changing status label to `Needs Information from Developers`), this needs to be the responsibility of a module (so a `Module` label must be added)

Philipp Oeser added the

Module

Nodes & Physics

label 2023-02-14 12:35:08 +01:00

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Memory spike after setting domain resolution #89586