Cycles GPU prioritizing CPU instead. #97146

New Issue

RAM · 2022-04-07T18:01:44+02:00

RAM commented

2022-04-07 18:01:44 +02:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.47

Blender Version
Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash: c77597cd0e
Worked: (newest version of Blender that worked as expected)

Short description of error
I have been trying to render in 3.1 latest build with cycles GPU, but renders were way too slow.
I checked and my CPU and GPU both were enabled in Optix(preferences). So to throubleshoot, i desabled CPU and only left GPU checked in system preferences.
Then only cycles ran faster as it would work on GPU. Anytime both are enabled, cycles doesnt seem to render on GPU like it used to in previous versions.

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)]

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.47 **Blender Version** Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash: `c77597cd0e` Worked: (newest version of Blender that worked as expected) **Short description of error** I have been trying to render in 3.1 latest build with cycles GPU, but renders were way too slow. I checked and my CPU and GPU both were enabled in Optix(preferences). So to throubleshoot, i desabled CPU and only left GPU checked in system preferences. Then only cycles ran faster as it would work on GPU. Anytime both are enabled, cycles doesnt seem to render on GPU like it used to in previous versions. **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)]

RAM commented

2022-04-07 18:01:44 +02:00

Added subscriber: @CrossmindStudio

Pratik Borhade commented

2022-04-08 05:38:43 +02:00

Added subscriber: @PratikPB2123

Pratik Borhade commented

2022-04-08 05:57:18 +02:00

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

Pratik Borhade commented

2022-04-08 05:57:18 +02:00

Hi, thanks for the report. Do you have this problem when rendering large scene?
Slow performance with CPU + GPU is probably expected in some cases. Some work is going on in that area #95687
Did you have this issue in other blender versions? 2.93LTS for example? Then this may be related #95836

Hi, thanks for the report. Do you have this problem when rendering large scene? Slow performance with CPU + GPU is probably expected in some cases. Some work is going on in that area #95687 Did you have this issue in other blender versions? 2.93LTS for example? Then this may be related #95836

Lowricsec commented

2022-04-08 06:08:02 +02:00

Added subscriber: @Lowricsec

Lowricsec commented

2022-04-08 06:08:02 +02:00

I have the same issue in 3.2.

I had performance monitoring software open, CPU is pinned at 100% while GPU is at idle.

I have the same issue in 3.2. I had performance monitoring software open, CPU is pinned at 100% while GPU is at idle.

RAM commented

2022-04-13 19:49:44 +02:00

In #97146#1337728, @PratikPB2123 wrote:
Hi, thanks for the report. Do you have this problem when rendering large scene?
Slow performance with CPU + GPU is probably expected in some cases. Some work is going on in that area #95687
Did you have this issue in other blender versions? 2.93LTS for example? Then this may be related #95836

I didn't had this issue with previous versions of Blender. Also trying to figure out this issue with other files, some files are working fine, but other had this issue.
Not sure of the cause, i will have to test more. Will add more observations soon while i am working on the project.

> In #97146#1337728, @PratikPB2123 wrote: > Hi, thanks for the report. Do you have this problem when rendering large scene? > Slow performance with CPU + GPU is probably expected in some cases. Some work is going on in that area #95687 > Did you have this issue in other blender versions? 2.93LTS for example? Then this may be related #95836 I didn't had this issue with previous versions of Blender. Also trying to figure out this issue with other files, some files are working fine, but other had this issue. Not sure of the cause, i will have to test more. Will add more observations soon while i am working on the project.

Pratik Borhade commented

2022-04-29 08:12:08 +02:00

Not sure of the cause, i will have to test more. Will add more observations soon while i am working on the project.

Any news?

> Not sure of the cause, i will have to test more. Will add more observations soon while i am working on the project. Any news?

RAM commented

2022-05-08 20:51:34 +02:00

I haven't been able to test more on this. Although i tried a few times to re create the bug, but i couldnt identify what was causing the issue.
It happend with a project where i was using heavy assembly from CAD software. didnt notice it on other projects. I will surely report it once i have solid information.

I haven't been able to test more on this. Although i tried a few times to re create the bug, but i couldnt identify what was causing the issue. It happend with a project where i was using heavy assembly from CAD software. didnt notice it on other projects. I will surely report it once i have solid information.

Pratik Borhade commented

2022-07-29 05:49:43 +02:00

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

Pratik Borhade closed this issue

2022-07-29 05:49:43 +02:00

Pratik Borhade commented

2022-07-29 05:49:43 +02:00

@CrossmindStudio hi, could you open a new report or comment here when you find more information about the issue.
I'm closing this report for now dues to less activity.

Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.47

Also make sure your GPU drivers are up-to-date

@CrossmindStudio hi, could you open a new report or comment here when you find more information about the issue. I'm closing this report for now dues to less activity. > Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.47 Also make sure your GPU drivers are up-to-date

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Cycles GPU prioritizing CPU instead. #97146