Excessive CPU load and slow animation playback #86658

New Issue

steven · 2021-03-17T10:03:28+01:00

steven commented

2021-03-17 10:03:28 +01:00

System Information
Operating system: Win 10 1909
CPU: Threadripper 3990X
RAM: 128GB
Graphics card: RTX 2080 TI

Blender Version
Broken: 2.93A, 2.92, 2.91
Worked: 2.83 LTS all versions

Short description of error
Playing back the animation results in an excessive CPU load and very low FPS in all 2.9X versions of blender.
Even removing all meshes from the scene and having just the armature results in an extreme CPU load with very slow playback.
This issue is not present in 2.83.

Below are some screenshots I took with the tree creature file, as well as a human rig.
as you can see the CPU load is around 4% with the human rig in 2.83 and 54FPS. when opening the same in 2.9X, the CPU load is 80% with 42FPS.
This is with no keyframes set, when using a scene that has keyframes, the difference is much greater. 48FPS in 2.83 vs 11FPS in 2.9x.

Exact steps for others to reproduce the error

Load any character with an animated armature
hit space to play and look at frame rate and CPU load.

**System Information** Operating system: Win 10 1909 CPU: Threadripper 3990X RAM: 128GB Graphics card: RTX 2080 TI **Blender Version** Broken: 2.93A, 2.92, 2.91 Worked: 2.83 LTS all versions **Short description of error** Playing back the animation results in an excessive CPU load and very low FPS in all 2.9X versions of blender. Even removing all meshes from the scene and having just the armature results in an extreme CPU load with very slow playback. This issue is not present in 2.83. Below are some screenshots I took with the tree creature file, as well as a human rig. as you can see the CPU load is around 4% with the human rig in 2.83 and 54FPS. when opening the same in 2.9X, the CPU load is 80% with 42FPS. This is with no keyframes set, when using a scene that has keyframes, the difference is much greater. 48FPS in 2.83 vs 11FPS in 2.9x. ![2.83.PNG](https://archive.blender.org/developer/F9896103/2.83.PNG) ![2.93.PNG](https://archive.blender.org/developer/F9896105/2.93.PNG) ![human 2.83.PNG](https://archive.blender.org/developer/F9896107/human_2.83.PNG) ![human 2.93.PNG](https://archive.blender.org/developer/F9896109/human_2.93.PNG) **Exact steps for others to reproduce the error** - Load any character with an animated armature - hit space to play and look at frame rate and CPU load.

steven commented

2021-03-17 10:03:28 +01:00

Added subscriber: @steven850

Germano Cavalcante commented

2021-03-18 20:59:54 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-03-18 20:59:54 +01:00

I can see an increase in CPU usage from 26% to 33% with the tree creature file.
However, the FPS remained the same (around 12 fps in my case).

**System Information**
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.14760 Core Profile Context 20.45.37.01 27.20.14537.1001

The apparent regression occurred at some point between 826f6dd9ee (Apr 23) and fdebdfa320 (May 4)

I can see an increase in CPU usage from 26% to 33% with the tree creature file. However, the FPS remained the same (around 12 fps in my case). ``` **System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: Radeon (TM) RX 480 Graphics ATI Technologies Inc. 4.5.14760 Core Profile Context 20.45.37.01 27.20.14537.1001 ``` The apparent regression occurred at some point between 826f6dd9ee20 (Apr 23) and fdebdfa320ec (May 4)

steven commented

2021-03-18 21:26:37 +01:00

What CPU did you test that with? I can go to single numa node, and disable cores to match yours to see if I get the same numbers.

Germano Cavalcante commented

2021-03-18 22:31:58 +01:00

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

Germano Cavalcante commented

2021-03-18 22:31:58 +01:00

My CPU is an AMD Ryzen 7 1800x
The increase in CPU usage was caused by d8a3f3595a.

I don’t know if it’s a known effect in favor of something, but I believe it deserves an investigation, so I am confirming it as a bug for now.

My CPU is an `AMD Ryzen 7 1800x` The increase in CPU usage was caused by d8a3f3595a. I don’t know if it’s a known effect in favor of something, but I believe it deserves an investigation, so I am confirming it as a bug for now.

steven commented

2021-03-19 09:12:23 +01:00

To clarify, on the tree creature file I obviously have all objects except the creature hidden, and subsurf turned off.

I disabled some cores and went to 8 to match your CPU and these are the results I got.
CPU load goes from 39 to 65%

Increased to 32 cores, single numa node and got the following
Still seeing a doubling of the cpu load, but also a decrease in FPS as core count increases.

8 cores = 25 fps
32 cores= 21 fps
64cores= 18 fps

seeing the same results with the human rig. As Core count increases CPU load increases and FPS drops. With 8 cores I was actually getting 60FPS.

To clarify, on the tree creature file I obviously have all objects except the creature hidden, and subsurf turned off. I disabled some cores and went to 8 to match your CPU and these are the results I got. CPU load goes from 39 to 65% ![2.83 8 core tree.PNG](https://archive.blender.org/developer/F9899181/2.83_8_core_tree.PNG) ![2.93 8 core tree.PNG](https://archive.blender.org/developer/F9899183/2.93_8_core_tree.PNG) Increased to 32 cores, single numa node and got the following Still seeing a doubling of the cpu load, but also a decrease in FPS as core count increases. 8 cores = 25 fps 32 cores= 21 fps 64cores= 18 fps ![2.83 32 core tree.PNG](https://archive.blender.org/developer/F9899185/2.83_32_core_tree.PNG) ![2.93 32 core tree.PNG](https://archive.blender.org/developer/F9899187/2.93_32_core_tree.PNG) seeing the same results with the human rig. As Core count increases CPU load increases and FPS drops. With 8 cores I was actually getting 60FPS. ![2.83 8 core.PNG](https://archive.blender.org/developer/F9899195/2.83_8_core.PNG) ![2.93 8 core.PNG](https://archive.blender.org/developer/F9899197/2.93_8_core.PNG) ![2.83 32 core.PNG](https://archive.blender.org/developer/F9899199/2.83_32_core.PNG) ![2.93 32 core.PNG](https://archive.blender.org/developer/F9899201/2.93_32_core.PNG)

Germano Cavalcante commented

2021-03-19 16:11:23 +01:00

In #86658#1132392, @steven850 wrote:
To clarify, on the tree creature file I obviously have all objects except the creature hidden, and subsurf turned off.

In that case it would be good to attach a simplified file where the problem is more evident.

I tested it with a different number of threads,
I noticed a bigger difference between 8 and 16 threads.

EDITED:

threads	fps
8	13.1
16	11.9

> In #86658#1132392, @steven850 wrote: > To clarify, on the tree creature file I obviously have all objects except the creature hidden, and subsurf turned off. In that case it would be good to attach a simplified file where the problem is more evident. I tested it with a different number of threads, I noticed a bigger difference between 8 and 16 threads. EDITED: |threads|fps| | -- | -- | |8|13.1| |16|11.9|

steven commented

2021-03-19 17:03:03 +01:00

Here is the file
http://www.fileconvoy.com/dfl.php?id=g8be654343cf404e61000336304833419b611f3af6e

Here is the file http://www.fileconvoy.com/dfl.php?id=g8be654343cf404e61000336304833419b611f3af6e

Bastien Montagne commented

2021-10-06 17:39:14 +02:00

Added subscribers: @JulianEisel, @Jeroen-Bakker, @dr.sybren, @mont29

Bastien Montagne commented

2021-10-06 17:39:14 +02:00

@JulianEisel @dr.sybren @Jeroen-Bakker Ping for reference since this concerns either new TBB integration and/or general animation/depsgraph evaluation areas.

But in any case, we need decently simple reproducible case stored on this tracker (the linked file is no longer available, and a 400Mb one is not exactly suitable for investigation).

So will archive for now, thanks for the report anyway.

@JulianEisel @dr.sybren @Jeroen-Bakker Ping for reference since this concerns either new TBB integration and/or general animation/depsgraph evaluation areas. But in any case, we need decently simple reproducible case stored on this tracker (the linked file is no longer available, and a 400Mb one is not exactly suitable for investigation). So will archive for now, thanks for the report anyway.

Bastien Montagne commented

2021-10-06 17:40:06 +02:00

Changed status from 'Confirmed' to: 'Archived'

Bastien Montagne closed this issue

2021-10-06 17:40:06 +02:00

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Excessive CPU load and slow animation playback #86658