Blender not taking advantage of all gpus #110531

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opened 2023-07-27 14:23:12 +02:00 by ektor-christakis · 22 comments

ektor-christakis commented

2023-07-27 14:23:12 +02:00

System Information
Operating system: windows 11
Graphics card:6*3090

Blender Version
Broken: 3.6.1

download any scene that is old in blender website for render benchmarks

**System Information** Operating system: windows 11 Graphics card:6*3090 **Blender Version** Broken: 3.6.1 download any scene that is old in blender website for render benchmarks

ektor-christakis added the

labels 2023-07-27 14:23:13 +02:00

YimingWu commented

2023-07-27 15:13:07 +02:00

Member

Hi @ektor-christakis :

For Cycles rendering: have you enabled all GPUs in the User Preference > System > Cycles Render Devices?
EEVEE does not support multi-GPU rendering as of now.

Could you tell us what renderer you are using?

Hi @ektor-christakis : - For Cycles rendering: have you enabled all GPUs in the `User Preference > System > Cycles Render Devices`? - EEVEE does not support multi-GPU rendering as of now. Could you tell us what renderer you are using?

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labels 2023-07-27 15:14:16 +02:00

ektor-christakis commented

2023-07-27 15:23:05 +02:00

Author

i am using cycles the interesting thing is when i use optix it will render but only with one gpu/one tile rendering at a time but when i run cuda it just crashes

i am using cycles the interesting thing is when i use optix it will render but only with one gpu/one tile rendering at a time but when i run cuda it just crashes

YimingWu commented

2023-07-27 15:27:29 +02:00

Member

Oh interesting. Could you share your system info file here? Use blender menu Help > Save System Info to get it. Thanks!

Oh interesting. Could you share your system info file here? Use blender menu `Help > Save System Info` to get it. Thanks!

ektor-christakis commented

2023-07-27 15:49:21 +02:00

Author

also btw i dont know why it says 3.4 maybe because the file i downloaded was a demo from 3.4 but i use 3.6

also btw i dont know why it says 3.4 maybe because the file i downloaded was a demo from 3.4 but i use 3.6

system-info.txt

36 KiB

ektor-christakis commented

2023-07-27 15:56:43 +02:00

Author

![image](/attachments/b0a19fa9-3e61-4637-af06-83e93fb6d4f2)

795 KiB

ektor-christakis commented

2023-07-27 15:57:23 +02:00

Author

see? only one tile rendering at a time but there is clearly 4 gpus that i have enabled and it is not using

see? only one tile rendering at a time but there is clearly 4 gpus that i have enabled and it is not using

ektor-christakis commented

2023-07-27 15:58:06 +02:00

Author

and also this is on a renderfarm i asked them to change to a windows 10 machine because 11 is maybe more unstable but the problem is still here

and also this is on a renderfarm i asked them to change to a windows 10 machine because 11 is maybe more unstable but the problem is still here

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Render & Cycles

Render & Cycles

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labels 2023-07-27 16:13:45 +02:00

YimingWu commented

2023-07-27 16:16:53 +02:00

Member

Looks like it's reporting at least 4x 3090 devices in the CUDA section, but not 6. If it's from render farm you probably need to contact their tech support for configuration.

Added module so we can see if cycles developers can provide more insights.

Looks like it's reporting at least 4x 3090 devices in the CUDA section, but not 6. If it's from render farm you probably need to contact their tech support for configuration. Added module so we can see if cycles developers can provide more insights.

ektor-christakis commented

2023-07-27 16:20:34 +02:00

Author

i changed from 6 to 4 i told them to change the node because windows 11 was being laggy

i changed from 6 to 4 i told them to change the node because windows 11 was being laggy

YimingWu commented

2023-07-27 16:21:52 +02:00

Member

@ektor-christakis The system info from your device is probably gonna be different from the blender installation on the render farm. So does this mean your device is running 4x3090 and 3.4 or something? Could you also clarify? Thanks!

@ektor-christakis The system info from your device is probably gonna be different from the blender installation on the render farm. So does this mean your device is running 4x3090 and 3.4 or something? Could you also clarify? Thanks!

Brecht Van Lommel commented

2023-07-27 16:22:32 +02:00

Owner

Since Blender 3.0, multi GPU rendering works differently. Rather than each GPU rendering its own tile, they all cooperate on the same tile. For that reason the tile size should generally be left to the default 2048px, rather than changed to a small value as was done here, as that is not efficient.

Since Blender 3.0, multi GPU rendering works differently. Rather than each GPU rendering its own tile, they all cooperate on the same tile. For that reason the tile size should generally be left to the default 2048px, rather than changed to a small value as was done here, as that is not efficient.

ektor-christakis commented

2023-07-27 16:26:17 +02:00

Author

i have full access to the node and when i wrote this issue i was on a node with 6 gpus and windows 11. i asked them to change to a windows 10 node so now it is windows 10 and 4 gpus and i also asked them to install blender3.6. In the system info it said that because the scene i downloaded was from the demo options on your website that was made in 3.4

i have full access to the node and when i wrote this issue i was on a node with 6 gpus and windows 11. i asked them to change to a windows 10 node so now it is windows 10 and 4 gpus and i also asked them to install blender3.6. In the system info it said that because the scene i downloaded was from the demo options on your website that was made in 3.4

Raimund Klink commented

2023-07-27 16:29:27 +02:00

Contributor

If the report says it is Blender 3.4, then Blender 3.4 was used to create the report. The report doesn't depend on the opened .blend file.

Also, look in the bottom right corner of the Blender UI. It will tell you the currently used version.
If you want to make sure, download the portable version of Blender here: https://www.blender.org/download/

If the report says it is Blender 3.4, then Blender 3.4 was used to create the report. The report doesn't depend on the opened .blend file. Also, look in the bottom right corner of the Blender UI. It will tell you the currently used version. If you want to make sure, download the portable version of Blender here: https://www.blender.org/download/

ektor-christakis commented

2023-07-27 16:38:00 +02:00

Author

alright now it should say 3.6

alright now it should say 3.6

system-info.txt

36 KiB

Raimund Klink commented

2023-07-27 16:41:07 +02:00

Contributor

Amazing. Now set the tile size back to 2048, and you should be fine.

Amazing. Now set the tile size back to 2048, and you should be fine. ![image](/attachments/7cc94ba9-39a8-43e6-a0f5-1e8317333d58)

35 KiB

ektor-christakis commented

2023-07-27 16:41:12 +02:00

Author

lemme do some renders with optix and cuda and i will comment the results and if it crashes

lemme do some renders with optix and cuda and i will comment the results and if it crashes

ektor-christakis commented

2023-07-27 16:47:47 +02:00

Author

also if i want to render a large scene and 24 gb is not enough do i need nvlink to use the combined memory of the four cards? is there any other way

also if i want to render a large scene and 24 gb is not enough do i need nvlink to use the combined memory of the four cards? is there any other way

YimingWu commented

2023-07-27 16:47:55 +02:00

Member

Relevant development in improving multi-GPU utilization: #110348 #108147

Mark this as confirmed since it's still in the process of being improved.

Relevant development in improving multi-GPU utilization: #110348 #108147 Mark this as confirmed since it's still in the process of being improved.

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labels 2023-07-27 16:48:35 +02:00

Iliya Katushenock removed the

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label 2023-07-27 16:49:29 +02:00

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Brecht Van Lommel commented

2023-07-27 16:51:48 +02:00

Owner

This is not confirmed, if there is a new issue raised by this bug report it can stay open, otherwise we have existing tasks related to this.

So far it looks more like a support / configuration / settings issue that we should close.

This is not confirmed, if there is a new issue raised by this bug report it can stay open, otherwise we have existing tasks related to this. So far it looks more like a support / configuration / settings issue that we should close.

YimingWu commented

2023-07-27 16:55:29 +02:00

Member

Ok that sounds reasonable. I'll close it then. @ektor-christakis if you have updates on the situation please feel free to discuss below or open new reports with new information. Thanks!

Ok that sounds reasonable. I'll close it then. @ektor-christakis if you have updates on the situation please feel free to discuss below or open new reports with new information. Thanks!

ektor-christakis commented

2023-07-27 17:09:50 +02:00

Author

Optix:
4 gpus:0:32
3 gpus:0:46
2 gpus:1:01
1 gpu: 2:07
Cuda:
4 gpus:0:45
3 gpus:1:02
2 gpus:1:31
1 gpu: 2:56

This seems to be the result it does indeed use the 4 gpus i thought it didnt work because i had seen in some old videos of people rendering with multiple gpus and having a lot of tiles rendering at once

Optix: 4 gpus:0:32 3 gpus:0:46 2 gpus:1:01 1 gpu: 2:07 Cuda: 4 gpus:0:45 3 gpus:1:02 2 gpus:1:31 1 gpu: 2:56 This seems to be the result it does indeed use the 4 gpus i thought it didnt work because i had seen in some old videos of people rendering with multiple gpus and having a lot of tiles rendering at once

Brecht Van Lommel commented

2023-07-27 17:19:30 +02:00

Owner

Thanks for testing, let's consider this not a bug then.

Thanks for testing, let's consider this not a bug then.

Brecht Van Lommel closed this issue

2023-07-27 17:19:33 +02:00

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