Multiple CUDA gpu are not being identified or used correctly #55329

New Issue

Gabe E. Nydick · 2018-06-05T00:32:15+02:00

Gabe E. Nydick commented

2018-06-05 00:32:15 +02:00

OS: Windows 10 Pro 64bit, April Update
Blender: 2.79b f4dc9f9d68
GPU: 2 x EVGA GTX1080 Hybrid (not FTW Hybrid, just the base Hybrid)

I have both monitors hooked up to one card. When I launch blender and configure GPU rendering it shows two GPUs, but both say "(Display)" next to them. When I render, I often get the error "illegal address in cuctxsynchronize line 1372". I increase the TdrDelay and it improves things. But the more complex the render, the longer that value has to go up, or if I'm overclocking.

Now, If I select only one of my GPUs to use for rendering, let's call it the "top one" in the list of GPUs, and I render, GPU0 in my task manager shows high usage and GPU1 shows 0%. If I go back into blender and deselect the "top one" and select the "bottom one" and run the render, the same exact result happens in task manager. GPU0 shows high usage and GPU1 shows 0%.

This happens for every blend file, simple or complex. All I have to do is click 'render'

I've tried this with and without SLI enabled, as well as with and without the SLI bridge installed.

OS: Windows 10 Pro 64bit, April Update Blender: 2.79b f4dc9f9d68b GPU: 2 x EVGA GTX1080 Hybrid (not FTW Hybrid, just the base Hybrid) I have both monitors hooked up to one card. When I launch blender and configure GPU rendering it shows two GPUs, but both say "(Display)" next to them. When I render, I often get the error "illegal address in cuctxsynchronize line 1372". I increase the TdrDelay and it improves things. But the more complex the render, the longer that value has to go up, or if I'm overclocking. Now, If I select only one of my GPUs to use for rendering, let's call it the "top one" in the list of GPUs, and I render, GPU0 in my task manager shows high usage and GPU1 shows 0%. If I go back into blender and deselect the "top one" and select the "bottom one" and run the render, the same exact result happens in task manager. GPU0 shows high usage and GPU1 shows 0%. This happens for every blend file, simple or complex. All I have to do is click 'render' I've tried this with and without SLI enabled, as well as with and without the SLI bridge installed.

Gabe E. Nydick commented

2018-06-05 00:32:15 +02:00

Added subscriber: @GabeE.Nydick

Bastien Montagne commented

2018-07-22 17:57:29 +02:00

Added subscribers: @brecht, @mont29

Brecht Van Lommel was assigned by Bastien Montagne

2018-07-22 17:57:29 +02:00

Bastien Montagne commented

2018-07-22 17:57:29 +02:00

Not quiet sure we can do much here, but will let @brecht decide.

Gabe E. Nydick commented

2018-08-13 01:01:18 +02:00

I'm not sure why you can't do much, seems like blender isn't interacting with the cuda libraries to detect gpus. Can you explain more?

Gabe E. Nydick commented

2019-01-21 20:38:37 +01:00

Just an FYI, the same problem is happening in 2.8 beta

Brecht Van Lommel was unassigned by Dalai Felinto

2019-12-23 16:36:10 +01:00

Aaron Carlisle commented

2020-02-10 22:23:14 +01:00

Added subscriber: @Blendify

Aaron Carlisle commented

2020-02-10 22:23:14 +01:00

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

Aaron Carlisle commented

2020-02-10 22:23:14 +01:00

Can you test if this is working with Blender 2.83 from https://builder.blender.org/download/

Aaron Carlisle commented

2020-02-18 19:34:22 +01:00

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

Aaron Carlisle closed this issue

2020-02-18 19:34:22 +01:00

Aaron Carlisle self-assigned this 2020-02-18 19:34:22 +01:00

Aaron Carlisle commented

2020-02-18 19:34:22 +01:00

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed.

Thanks again for the report. If the problem persists please open a new report with the required information.

No activity for more than a week. As per the tracker policy we assume the issue is gone and can be closed. Thanks again for the report. If the problem persists please open a new report with the required information.

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Multiple CUDA gpu are not being identified or used correctly #55329