Commandline render takes too long synchronizing objects in cycles #69843

New Issue

Ricardo Drehmer · 2019-09-13T15:14:26+02:00

Ricardo Drehmer commented

2019-09-13 15:14:26 +02:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.60

Blender Version
Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f5449
Worked: (optional)

Short description of error
Commandline render takes a big amount of time synchronizing all objects in scene.
It seems to be just a matter of taking too long to actually PRINT the log to console, as per https://developer.blender.org/T62833.

Exact steps for others to reproduce the error

Factory settings
Create 3000 cubes (separate objects)
Set engine to Cycles
Save file
Press F12, just for cientific purposes. Buckets should start immediately.
Close Blender and run a command line frame render. Here is what I used:

cd %blender%
blender -b "path\file.blend" -f 0

It should take several seconds to synchronize from Cube to Cube.3000 prior to actually start rendering.

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce RTX 2060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.60 **Blender Version** Broken: version: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: `f6cb5f5449` Worked: (optional) **Short description of error** Commandline render takes a big amount of time synchronizing all objects in scene. It seems to be just a matter of taking too long to actually PRINT the log to console, as per https://developer.blender.org/T62833. **Exact steps for others to reproduce the error** - Factory settings - Create 3000 cubes (separate objects) - Set engine to Cycles - Save file - Press F12, just for cientific purposes. Buckets should start immediately. - Close Blender and run a command line frame render. Here is what I used: ``` cd %blender% blender -b "path\file.blend" -f 0 ``` It should take several seconds to synchronize from Cube to Cube.3000 prior to actually start rendering.

Ricardo Drehmer commented

2019-09-13 15:14:26 +02:00

Added subscriber: @RDrehmer

Jacques Lucke commented

2019-09-19 15:50:57 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2019-09-19 15:50:57 +02:00

Please prepare a .blend file so that everyone can reproduce the issue using the same file.

Ricardo Drehmer commented

2019-09-19 15:58:58 +02:00

a.blend

Sure! Here it is!
It's a file set for Cycles rendering with 3000 cubes.

Again, the command used for rendering was:

cd %blender%
blender -b "path\file.blend" -f 0

And, as per bug report mentioned above, it seems to occur on Windows only

[a.blend](https://archive.blender.org/developer/F7758380/a.blend) Sure! Here it is! It's a file set for Cycles rendering with 3000 cubes. Again, the command used for rendering was: ``` cd %blender% blender -b "path\file.blend" -f 0 ``` And, as per bug report mentioned above, it seems to occur on Windows only

Jacques Lucke commented

2019-09-19 16:25:19 +02:00

Added subscriber: @brecht

Jacques Lucke commented

2019-09-19 16:25:19 +02:00

Can confirm the issue. The syncing takes about 20s for me when its printing to the Powershell on windows. Without the printing it is done in less than a second.
Maybe there should be a command line option to disable the printing? Or maybe it is faster to log everything to a file instead? I don't know what the best solution to the problem is.

Can confirm the issue. The syncing takes about 20s for me when its printing to the Powershell on windows. Without the printing it is done in less than a second. Maybe there should be a command line option to disable the printing? Or maybe it is faster to log everything to a file instead? I don't know what the best solution to the problem is.

Ricardo Drehmer commented

2019-09-19 16:35:35 +02:00

I guess a single print of "Synchronizing objects" could be sufficient for a normal situation.
And if you need a print for each object (to see which one is taking too long, for example), one could enable a debug mode or raise the verbosity level up a notch.

I guess a single print of "Synchronizing objects" could be sufficient for a normal situation. And if you need a print for each object (to see which one is taking too long, for example), one could enable a debug mode or raise the verbosity level up a notch.

Thomas Dinges commented

2022-11-24 16:36:17 +01:00

Added subscriber: @ThomasDinges

Thomas Dinges commented

2022-11-24 16:36:17 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Thomas Dinges closed this issue

2022-11-24 16:36:17 +01:00

Thomas Dinges self-assigned this 2022-11-24 16:36:17 +01:00

Thomas Dinges commented

2022-11-24 16:36:17 +01:00

Cannot confirm this anymore with Blender 3.4, total render time is 00:08.71.

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Commandline render takes too long synchronizing objects in cycles #69843