Existence of vertex group significantly slow down select polygon/edge/vertex in edit mode with high density meshes. #84114

New Issue

Alexander · 2020-12-24T20:33:41+01:00

Alexander commented

2020-12-24 20:33:41 +01:00

System Information
Operating system: Windows 10
Graphics card: GTX 1060 3Gb

Blender Version
Broken: 2.91.0
Worked: -

Short description of error
If we have vertex group in object, selecting polygons, edges, vertex are significantly slower. If we remove vertex group performance of same operations are significantly faster.

Exact steps for others to reproduce the error
Subdivide any mesh to around 600-700k polygons.
Go to edit mode, select at least 25k or more vertex and adding them to vertex group.
Try to select polygons/edges/vertex - selecting process will be very slow.

Removing vertex group solve the problem.

**System Information** Operating system: Windows 10 Graphics card: GTX 1060 3Gb **Blender Version** Broken: 2.91.0 Worked: - **Short description of error** If we have vertex group in object, selecting polygons, edges, vertex are significantly slower. If we remove vertex group performance of same operations are significantly faster. **Exact steps for others to reproduce the error** Subdivide any mesh to around 600-700k polygons. Go to edit mode, select at least 25k or more vertex and adding them to vertex group. Try to select polygons/edges/vertex - selecting process will be very slow. Removing vertex group solve the problem.

Alexander commented

2020-12-24 20:33:41 +01:00

Added subscriber: @Alexander-35

Stanislav Blinov commented

2020-12-25 23:58:26 +01:00

Added subscriber: @Stan_Pancakes

Philipp Oeser commented

2021-01-07 18:33:41 +01:00

Added subscribers: @fclem, @mont29, @ideasman42, @lichtwerk

Philipp Oeser commented

2021-01-07 18:33:41 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2021-01-07 18:33:41 +01:00

Can confirm.

Especially deselecting (e.g. box select in empty space) is painfully slow.
#84114.blend

Sysprof tells me ~40% of the time is spent in BLI_array_store_state_add (but that doesnt really tell me much - and also does not account for the rest of the time spent)

This might all be a known limitation, part of #73360 (Fast highpoly mesh editing) already (since it looks like GPU is spending time, too? or data transferred there?)

I was also checking on not letting the operator do anything (aka: return early/immediately) and it looks like the Undo step is eating up a whole lot of time ( this is where BLI_array_store_state_add comes into play again -- which is used in undo code um_arraystore_cd_compact)

@fclem, @mont29, @ideasman42 : does this ring a bell?

Can confirm. Especially deselecting (e.g. box select in empty space) is painfully slow. [#84114.blend](https://archive.blender.org/developer/F9554355/T84114.blend) Sysprof tells me ~40% of the time is spent in `BLI_array_store_state_add` (but that doesnt really tell me much - and also does not account for the rest of the time spent) This might all be a known limitation, part of #73360 (Fast highpoly mesh editing) already (since it looks like GPU is spending time, too? or data transferred there?) I was also checking on not letting the operator do **anything** (aka: return early/immediately) and it looks like the Undo step is eating up a whole lot of time ( this is where `BLI_array_store_state_add` comes into play again -- which is used in undo code `um_arraystore_cd_compact`) @fclem, @mont29, @ideasman42 : does this ring a bell?

Campbell Barton commented

2021-02-11 08:13:29 +01:00

This is caused by the custom data being an array of pointers that's never matching. I'll commit a simple fix shortly.

Longer term it would be good if we could store this in a way that would de-duplicate matching data.

This is caused by the custom data being an array of pointers that's never matching. I'll commit a simple fix shortly. Longer term it would be good if we could store this in a way that would de-duplicate matching data.

Campbell Barton self-assigned this 2021-02-11 08:14:15 +01:00

blender-admin commented

2021-02-11 14:09:48 +01:00

This issue was referenced by 196dfc01a3

This issue was referenced by 196dfc01a3e99c3bef0e44acf599bca50ae0300e

Campbell Barton commented

2021-02-11 14:41:57 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Campbell Barton closed this issue

2021-02-11 14:41:57 +01:00

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Existence of vertex group significantly slow down select polygon/edge/vertex in edit mode with high density meshes. #84114