Optimization issue: The Repeat Zone can slow down and fully Freeze one's entire machine with certain node setups #115472

New Issue

Aza · 2023-11-27T12:58:00+01:00

Aza commented

2023-11-27 12:58:00 +01:00

System Information

Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 511.65
CPU: Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz 4.20 GHz

Blender Version

Broken: version: 4.0.1, branch: blender-v4.0-release, commit date: 2023-11-16 16:40, hash: d0dd92834a08
Worked: (newest version of Blender that worked as expected)

Short description of error

When using the Repeat Zone, if the user processes enough nodes in a single repeat zone, there is a high chance that Blender will not crash and instead monopolize the entire system's resources to attempt and finish the calculation. Causing the computer to potentially freeze, or even crash.

When this happens, all other softwares will start to malfunction and run out of memory, causing things like Audio to cut out or glitch, and overall "frame rate" of the machine to slow down.

I am aware this is probably very machine-dependent, but it is still a big issue, ideally users should not have to walk on eggs when trying to use such features, as they wonder when it is that their machine will crack down because of a wrong manipulation.

I have linked a reproduction file, which caused my Computer to become completely frozen and all other softwares to halt entirely while Blender was trying to finish the node calculation. Forcing me to restart it entirely, as my controls were completely unusable by then.

If able to execute fully, the file linked should create a blocky cave similar to the ones seen in games like Minecraft, otherwise your CPU will just suffer

Exact steps for others to reproduce the error

With the file linked:

Select the "Cube" mesh object
Go to the modifier stack
Enable the "Create Culled Cubes" geometry nodes modifier
Pray for your machine to be able to handle the load

## **System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 511.65 CPU: Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz 4.20 GHz ## **Blender Version** Broken: version: 4.0.1, branch: blender-v4.0-release, commit date: 2023-11-16 16:40, hash: `d0dd92834a08` Worked: (newest version of Blender that worked as expected) ## **Short description of error** When using the Repeat Zone, if the user processes enough nodes in a single repeat zone, there is a high chance that Blender will not crash and instead monopolize the entire system's resources to attempt and finish the calculation. Causing the computer to potentially freeze, or even crash. When this happens, all other softwares will start to malfunction and run out of memory, causing things like Audio to cut out or glitch, and overall "frame rate" of the machine to slow down. ------- I am aware this is probably very machine-dependent, but it is still a big issue, *ideally* users should not have to walk on eggs when trying to use such features, as they wonder when it is that their machine will crack down because of a wrong manipulation. I have linked a reproduction file, which caused my Computer to become completely frozen and all other softwares to halt entirely while Blender was trying to finish the node calculation. Forcing me to restart it entirely, as my controls were completely unusable by then. If able to execute fully, the file linked should create a blocky cave similar to the ones seen in games like Minecraft, otherwise your CPU will just suffer ## **Exact steps for others to reproduce the error** With the file linked: - Select the "Cube" mesh object - Go to the modifier stack - Enable the "Create Culled Cubes" geometry nodes modifier - Pray for your machine to be able to handle the load

geo_nodes_3D_grid.blend

1.4 MiB

Aza added the

labels 2023-11-27 12:58:00 +01:00

Iliya Katushenock commented

2023-11-27 13:08:21 +01:00

Thanks for the report. While we do continue to work on improving performance in general, potential performance improvements are not handled as bug reports.

To improve performance, consider using less complex geometry, simpler shaders and smaller textures.

This specific issues is related with the fact that geometry nodes in Repeat zone is executed parallelly if that is possible. So, in your file with inverted tree-like node graph (a lot of source and one result in a root), this lead a lot of parallel geometry processing threads for multiple iterations at the same time.

Thanks for the report. While we do continue to work on improving performance in general, potential performance improvements are not handled as bug reports. To improve performance, consider using less complex geometry, simpler shaders and smaller textures. This specific issues is related with the fact that geometry nodes in Repeat zone is executed parallelly if that is possible. So, in your file with inverted tree-like node graph (a lot of source and one result in a root), this lead a lot of parallel geometry processing threads for multiple iterations at the same time.

Iliya Katushenock closed this issue

2023-11-27 13:08:24 +01:00

Blender Bot added

and removed

labels 2023-11-27 13:08:26 +01:00

Iliya Katushenock added the