cycle render become extremely slow #70706

New Issue

star wang · 2019-10-10T15:26:45+02:00

star wang commented

2019-10-10 15:26:45 +02:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: Quadro P500/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.40

Blender Version
Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-09 22:31, hash: f61a8a2abd
Worked: (optional)

Short description of error
[Please fill out a short description of the error here]
the cycle render engine stop working while rendering image.
however,the cpu (i use cpu render)is still work at 100% and the fan is of the computer works loudly to discharge hot air at that time.

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]
update: cycle render engine render really slow in this scene while blender set at 350 samples and use cpu render.bathroom 2.zip
way to reproduce the bug : press render after unzip this zip file.

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: Quadro [P500](https://archive.blender.org/developer/P500.txt)/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.40 **Blender Version** Broken: version: 2.81 (sub 14), branch: master, commit date: 2019-10-09 22:31, hash: `f61a8a2abd` Worked: (optional) **Short description of error** [Please fill out a short description of the error here] the cycle render engine stop working while rendering image. however,the cpu (i use cpu render)is still work at 100% and the fan is of the computer works loudly to discharge hot air at that time. **Exact steps for others to reproduce the error** [Please describe the exact steps needed to reproduce the issue] [Based on the default startup or an attached .blend file (as simple as possible)] update: cycle render engine render really slow in this scene while blender set at 350 samples and use cpu render.[bathroom 2.zip](https://archive.blender.org/developer/F7805183/bathroom_2.zip) way to reproduce the bug : press render after unzip this zip file.

star wang commented

2019-10-10 15:26:45 +02:00

Added subscriber: @starnokia9310

Brecht Van Lommel commented

2019-10-10 15:30:16 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2019-10-10 15:30:16 +02:00

We require an example .blend file and exact steps to reproduce the problem, to investigate reports.

star wang commented

2019-10-11 10:05:46 +02:00

update: cycle render engine render really slow in this scene while blender set at 350 samples and use cpu render.bathroom 2.zip
way to reproduce the bug : press render after unzip this zip file

update: cycle render engine render really slow in this scene while blender set at 350 samples and use cpu render.[bathroom 2.zip](https://archive.blender.org/developer/F7805183/bathroom_2.zip) way to reproduce the bug : press render after unzip this zip file

star wang changed title from ~~cycle render phase automatically~~ to cycle render become extremely slow

2019-10-11 10:12:13 +02:00

Cris commented

2019-10-14 13:01:10 +02:00

Added subscriber: @onedev

Cris commented

2019-10-14 13:01:10 +02:00

How much RAM memory does your computer have?

dark999 commented

2019-10-14 13:50:35 +02:00

Added subscriber: @dark999

dark999 commented

2019-10-14 13:50:35 +02:00

i start to render this .blend file and i need more than 46 hours to end render (extimated from blender) on my older CPU 2012 workstation

mine system info: linux Blender 2.81 95f020c853, OpenSUSE Tumbleweed/KDE, AMD FX8350, 16GB DDR3, GTX690 2+2 GB VRam- Nvidia drivers 435.21
i test this scene on Blender 2.80 stable and i find same/similiar extimated render time, can you tell what official blender version work faster?
@starnokia9310 i think if you upload Help > System Info generated file and/or share your config (as CPU, memory size) should will help a lot to define this as not bug IMHO
thank you in advance for updating this report and for answers to maded questions

i start to render this .blend file and i need more than 46 hours to end render (extimated from blender) on my older CPU 2012 workstation mine system info: linux Blender 2.81 95f020c853d6, OpenSUSE Tumbleweed/KDE, AMD FX8350, 16GB DDR3, GTX690 2+2 GB VRam- Nvidia drivers 435.21 i test this scene on Blender 2.80 stable and i find same/similiar extimated render time, can you tell what official blender version work faster? @starnokia9310 i think if you upload `Help > System Info` generated file and/or share your config (as CPU, memory size) should will help a lot to define this as not bug IMHO thank you in advance for updating this report and for answers to maded questions ![image.png](https://archive.blender.org/developer/F7816237/image.png)

Jacques Lucke commented

2020-01-21 13:40:48 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-01-21 13:40:48 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Jacques Lucke commented

2020-01-21 13:40:48 +01:00

There are missing linked libraries in this file. Please make sure that you pack everything into the .blend file.

I do get a heap buffer overflow in IESTextParser in this file, but that seems unrelated.

There are missing linked libraries in this file. Please make sure that you pack everything into the .blend file. I do get a heap buffer overflow in `IESTextParser` in this file, but that seems unrelated.

Brecht Van Lommel commented

2020-01-21 13:59:55 +01:00

Changed status from 'Needs User Info' to: 'Archived'

Brecht Van Lommel closed this issue

2020-01-21 13:59:55 +01:00

Brecht Van Lommel self-assigned this 2020-01-21 13:59:55 +01:00

Brecht Van Lommel commented

2020-01-21 13:59:55 +01:00

This file indeed renders slow, due to hair. The hair has a very large radius which leads to many overlapping hairs, as well as using a quite expensive Principled Hair BSDF which does a lot of scattering.

So while we could potentially optimize rendering of cases like this, we don't consider this to be a bug.

This file indeed renders slow, due to hair. The hair has a very large radius which leads to many overlapping hairs, as well as using a quite expensive Principled Hair BSDF which does a lot of scattering. So while we could potentially optimize rendering of cases like this, we don't consider this to be a bug.

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cycle render become extremely slow #70706