The performance of Blender decreases as the number of buffered frame increases #108097

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opened 2023-05-20 08:43:04 +02:00 by WannaR · 8 comments

WannaR commented

2023-05-20 08:43:04 +02:00

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3050 Ti Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.61

Blender Version
Broken: version: 3.6.0 Beta, branch: blender-v3.6-release, commit date: 2023-05-17 23:33, hash: a9358f5274b6
Worked: unknown

Short description of error
[Using machine translation]
I created the “game of life” that uses simulation zone. This simulation performed well at the beginning, but when I played it to about 4000 frames, the entire Blender got stuck and the frame rate of the simulation was also decrease to lower than 24fps. At this point the utilization of CPU and GPU was also decreasing. Strange.

Exact steps for others to reproduce the error
use the attached .blend file (need blender 3.6)
play animation
observe frame rate changes

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3050 Ti Laptop GPU/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 531.61 **Blender Version** Broken: version: 3.6.0 Beta, branch: blender-v3.6-release, commit date: 2023-05-17 23:33, hash: `a9358f5274b6` Worked: unknown **Short description of error** [Using machine translation] I created the “game of life” that uses simulation zone. This simulation performed well at the beginning, but when I played it to about 4000 frames, the entire Blender got stuck and the frame rate of the simulation was also decrease to lower than 24fps. At this point the utilization of CPU and GPU was also decreasing. Strange. ![begin.png](/attachments/fcace353-f546-4e97-84e3-fdb675f5f2b8) ![about4000frame.png](/attachments/ecf1a4a1-9690-4f94-b862-c2fb1ccc6b1a) **Exact steps for others to reproduce the error** use the attached .blend file (need blender 3.6) play animation observe frame rate changes

about4000frame.png

1.1 MiB

生命游戏.blend

1.3 MiB

1.2 MiB

WannaR added the

labels 2023-05-20 08:43:05 +02:00

Iliya Katushenock commented

2023-05-20 09:12:10 +02:00

Member

Hey, thanks for report this. Can you check, if on 4000...frame your RAM is full and your hard disk is start working?

Hey, thanks for report this. Can you check, if on 4000...frame your RAM is full and your hard disk is start working?

Iliya Katushenock added the

Nodes & Physics

labels 2023-05-20 09:12:22 +02:00

WannaR commented

2023-05-20 09:25:10 +02:00

Author

Hey, thanks for report this. Can you check, if on 4000...frame your RAM is full and your hard disk is start working?

Blender used about 1.6GB RAM with almost no SSD used which should not be a issue. Maybe the bottleneck is memory bandwidth? I'm using 16G DDR4 3200Mhz dual channel memory. Performance almost linearly decreases with frame count.

> Hey, thanks for report this. Can you check, if on 4000...frame your RAM is full and your hard disk is start working? Blender used about 1.6GB RAM with almost no SSD used which should not be a issue. Maybe the bottleneck is memory bandwidth? I'm using 16G DDR4 3200Mhz dual channel memory. Performance almost linearly decreases with frame count.

Iliya Katushenock added

Nodes & Physics

and removed

Nodes & Physics

labels 2023-05-20 09:30:05 +02:00

Jesse Yurkovich commented

2023-05-20 09:45:05 +02:00

Member

I can confirm the issue. It has to do with the Cache option (the in memory cache) as can be seen below. Performance remains "slow" even if you replay the parts of the simulation that's been cached. Baking the simulation does not experience the problem.

Using the cache - low FPS and degraded performance	No cache - much higher FPS and flat performance

I can confirm the issue. It has to do with the Cache option (the in memory cache) as can be seen below. Performance remains "slow" even if you replay the parts of the simulation that's been cached. Baking the simulation does not experience the problem. | Using the cache - low FPS and degraded performance | No cache - much higher FPS and flat performance | | --- | --- | | ![bad-cache.png](/attachments/bfb50d88-3497-4ba3-96bf-67f604c01c6c) | ![good-no-cache.png](/attachments/f977c99d-0c35-435f-8a2a-5362b12366e1) |

bad-cache.png

478 KiB

good-no-cache.png

496 KiB

WannaR commented

2023-05-29 16:39:13 +02:00

Author

Still happened in the latest build (hash: e2a75814ac)

Still happened in the latest build (hash: `e2a75814ac`)

Jesse Yurkovich commented

2023-06-12 08:00:17 +02:00

Member

Some more information: It seems like the Timeline being opened has an effect on the situation.

Slow performance: If you have the timeline editor opened AND have the cache enabled
Fast performance: If you have the timeline editor opened AND have the cache disabled
Fast performance: If you have the timeline editor closed regardless of the cache option

A quick profile does show a problematic section of code inside timeline_cache_draw_simulation_nodes. It loops over each frame and 1) calls into ModifierSimulationCache::has_state_at_frame which also loops over frames in the cache (n^2 behavior) and 2) creates many small rectangles to draw the actual cached line which can maybe be made more efficient as well

Some more information: It seems like the Timeline being opened has an effect on the situation. - Slow performance: If you have the timeline editor opened AND have the cache _enabled_ - Fast performance: If you have the timeline editor opened AND have the cache _disabled_ - Fast performance: If you have the timeline editor closed regardless of the cache option A quick profile does show a problematic section of code inside `timeline_cache_draw_simulation_nodes`. It loops over each frame and 1) calls into `ModifierSimulationCache::has_state_at_frame` which also loops over frames in the cache (n^2 behavior) and 2) creates many small rectangles to draw the actual cached line which can maybe be made more efficient as well

Iliya Katushenock added the

label 2023-06-12 14:56:02 +02:00

Hans Goudey commented

2023-06-12 14:59:50 +02:00

Member

Thanks for looking into this @deadpin.

@JacquesLucke @LukasStockner I guess ModifierSimulationCache::states_at_frames_ should become a map or VectorSet, or we should guarantee that it's sorted and use binary search here.

Thanks for looking into this @deadpin. @JacquesLucke @LukasStockner I guess `ModifierSimulationCache::states_at_frames_` should become a map or `VectorSet`, or we should guarantee that it's sorted and use binary search here.

Dalai Felinto added

and removed

labels 2023-06-12 15:41:29 +02:00

Jacques Lucke commented

2023-06-14 16:11:12 +02:00

Member

Using binary search sounds good.

Using binary search sounds good.

Hans Goudey added

and removed

labels 2023-06-14 16:55:29 +02:00

Hans Goudey referenced this issue

2023-06-15 22:50:48 +02:00

Fix: Quadratic performance of simulation state frame lookup #109037

Hans Goudey referenced this issue from a commit

2023-06-16 14:21:56 +02:00

Fix: Quadratic performance of simulation state frame lookup

Hans Goudey referenced this issue from a commit

2023-06-16 14:23:36 +02:00

Fix: Quadratic performance of simulation state frame lookup

Hans Goudey commented

2023-06-16 17:58:36 +02:00

Member

Fixed by 6a05e5161b. Thanks for reporting!

Fixed by 6a05e5161bc7092cf3b25ea9f0164c5673f57bfb. Thanks for reporting!

Hans Goudey closed this issue

2023-06-16 17:58:39 +02:00

Blender Bot added

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labels 2023-06-16 17:58:47 +02:00

Hans Goudey added

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labels 2023-06-16 17:58:50 +02:00

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