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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
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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

about4000frame.png

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
生命游戏.blend
1.3 MiB
begin.png
1.2 MiB
about4000frame.png
1.1 MiB
WannaR added the
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Iliya Katushenock commented 2023-05-20 09:12:10 +02:00
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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?
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 labels 2023-05-20 09:12:22 +02:00
WannaR commented 2023-05-20 09:25:10 +02:00
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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.
Jesse Yurkovich commented 2023-05-20 09:45:05 +02:00
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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 good-no-cache.png
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
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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
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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
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Iliya Katushenock added the
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 label 2023-06-12 14:56:02 +02:00
Hans Goudey commented 2023-06-12 14:59:50 +02:00
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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
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Jacques Lucke commented 2023-06-14 16:11:12 +02:00
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Using binary search sounds good.

Using binary search sounds good.
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Hans Goudey commented 2023-06-16 17:58:36 +02:00
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Fixed by 6a05e5161b. Thanks for reporting!

Fixed by 6a05e5161bc7092cf3b25ea9f0164c5673f57bfb. Thanks for reporting!
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Hans Goudey added
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