Eevee in command-line batch mode is slow with particles/duplis #59649

New Issue

Jason Clarke · 2018-12-20T01:42:25+01:00

Jason Clarke commented

2018-12-20 01:42:25 +01:00

System Information
Operating system: Windows 10 64bit v1809
Graphics card: Nvidia RTX 2070

Blender Version
2.80, c4ee77cde8 2018-12-19 22:13

Short description of error
When rendering on the command line (using blender -b) with Eevee and particles set to object/group mode, the render is extremely slow. (in the attached example, 0.5 seconds in Blender GUI vs almost 10 seconds in batch mode).

The culprit appears to be Eevee writing a "syncing" message to output for every instance, as in the attached example file 80% of the render time is spent writing the message "Syncing Suzzane" over and over for some 7-8 seconds.

Exact steps for others to reproduce the error
Load a .blend with a very large number of duplis (several thousand will do). An example is here: eevee_duplis.blend
Render in the Blender interface, then render the same file on the command line via blender -b
Note the much slower render time and the massive console spam.

**System Information** Operating system: Windows 10 64bit v1809 Graphics card: Nvidia RTX 2070 **Blender Version** 2.80, c4ee77cde8b0 2018-12-19 22:13 **Short description of error** When rendering on the command line (using blender -b) with Eevee and particles set to object/group mode, the render is extremely slow. (in the attached example, 0.5 seconds in Blender GUI vs almost 10 seconds in batch mode). The culprit appears to be Eevee writing a "syncing" message to output for every instance, as in the attached example file 80% of the render time is spent writing the message "Syncing Suzzane" over and over for some 7-8 seconds. **Exact steps for others to reproduce the error** Load a .blend with a very large number of duplis (several thousand will do). An example is here: [eevee_duplis.blend](https://archive.blender.org/developer/F6011180/eevee_duplis.blend) Render in the Blender interface, then render the same file on the command line via blender -b Note the much slower render time and the massive console spam.

Jason Clarke commented

2018-12-20 01:42:25 +01:00

Added subscriber: @JasonClarke

Jacques Lucke commented

2018-12-20 13:52:02 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2018-12-20 13:52:02 +01:00

I can't reproduce it.

Can you give me the exact command you use for rendering?

I can't reproduce it. Can you give me the exact command you use for rendering?

Jason Clarke commented

2018-12-20 14:47:11 +01:00

blender -b eevee_duplis.blend -f 60

Make sure particles are baked, not sure if that cache transferred with the file correctly.

Early frames will have fewer objects and might not show the issue as a result.

## blender -b eevee_duplis.blend -f 60 Make sure particles are baked, not sure if that cache transferred with the file correctly. Early frames will have fewer objects and might not show the issue as a result.

Brecht Van Lommel commented

2018-12-20 23:40:39 +01:00

Added subscriber: @brecht

Brecht Van Lommel commented

2018-12-20 23:40:39 +01:00

This is likely specific to Windows and the command prompt, which is inefficient at printing large amounts of text.

Still it's not so useful to print this for every instance.

This is likely specific to Windows and the command prompt, which is inefficient at printing large amounts of text. Still it's not so useful to print this for every instance.

Clément Foucault was assigned by Philipp Oeser

2019-01-15 12:20:53 +01:00

blender-admin commented

2019-03-28 23:24:25 +01:00

This issue was referenced by 7cbd1b0c98

This issue was referenced by 7cbd1b0c98cc974b8cfb4f92da19249346062319

Clément Foucault commented

2019-03-28 23:24:48 +01:00

Changed status from 'Open' to: 'Resolved'

Clément Foucault closed this issue

2019-03-28 23:24:48 +01:00

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Eevee in command-line batch mode is slow with particles/duplis #59649

blender -b eevee_duplis.blend -f 60