Blender 3.5 Beta - GPU slower than CPU (AMD) #104910
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Reference: blender/blender#104910
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System Information
Operating system: Windows 11 Home
Graphics card: Radeon Graphics VII (AMD Ryzen 5 5500u)
Blender Version
Broken: (example: 3.5, v35.efc2e5134f5d, beta, 2023-02-17, as found on the final render)
Worked: 3.4.1
Short description of error
When rendering different scenes cpu goes faster than gpu, in particular with different scenario scenes.
Exact steps for others to reproduce the error
Set CPU and render a scene, set AMD Ryzen Graphics as detected, test it and generally require 1-2 minutes more, same thing happen with CPU + GPU (AMD Radeon Graphics and Ryzen 5 5500u detected)
Hi, thanks for the report. Is this a regression? I mean time taken by GPU for rendering in 3.4 is less compared to 3.5?
Can you share system info file?:
Help > Save System InfoThanks for your answer, exactly I tried but the problem persist. I upload the file require in txt format.
Thanks, Does this happen for particular .blend file?
Your answer on this question is still not clear to me. I'll forward this to devs if it's a regression.
Yes, sorry if I was not clear, it is a regression from the previous version
Thanks. Any improvements with newer GPU drivers (Adrenalin 23.2.1 (WHQL))?: https://www.amd.com/en/support/graphics/amd-radeon-2nd-generation-vega/amd-radeon-2nd-generation-vega/amd-radeon-vii
I upgrade from Adrenalin 22.11.2 Recommended (WHQL) to Adrenalin 23.2.1 (WHQL)
Result :
CPU : 02:24:77 (02:54:76 old version)
GPU : 03:27:47 (04:19:47 old version)
CPU + GPU : 03:38:24 (04:01:66 old version)
Thank in advance and thanks for the tip of upgradeIn particular GPU seems faster, cpu is around 1 minute faster compare to GPU.
Do you know any settings that can improve GPU performance and make faster than CPU?
I link below the upgraded version of system info
hi, and how long it takes to render same scene in 3.4 (CPU, GPU,
CPU+GPU~)?Around 2 mintutes
@Gioxyer hi, any updates on this?
Can you share .blend file you're using?
Hi, here some upgraded test with last version of today c760248fc5aa,daily section of Blender website, Blender 3.5 Beta.
Here the screenshot of the result and the file (download also BlenderKit Add-On with last version for materials).
Thanks in advance,
Gioxyer
I link also a video that show GPU usage compare to CPU when rendering the same scene with same settings, hope can help.
CPU + GPU usage
Hi, ran your file in both versions. In 3.5, rendering with cycles-Optix took around 1 second more compared to 3.4 (But GPU rendering was quicker than CPU in both versions)
Not sure if this is AMD specific.
Can you check with factory settings?:
File > Defaults > Load Factory SettingsThanks for testing, I've done it, after what I should do? Test again, I use today version now v35.f9f29eefc774 of Blender 3.5 Beta?
Load factory settings then open your file again without closing the blender.
And after that I need to test it again?
Result with factory settings
New test with today version v35.f9bcd8c7e8e2, Blender 3.5 Beta with new driver 23.2.2 (WHQL Recommended), hope can help.
Any news or discover?
@BrianSavery @Sayak-Biswas hi, can you check this? Any particular commit you suspect that could result in performance issue with Vega GPUs?
I see that it drops in performance as soon as it gets to the middle of the render (100/200 samples)
Hi. @Gioxyer I have a few questions. This thread is a bit all over to the place to be honest. What exactly is your question?
It sounds like you are asking "why is my GPU rendering slower than the CPU"? Is that correct? If this is the question, can you show the system preferences for which devices are selected in the preferences?
Secondly, you said this is a "regression". This would mean in a previous version version of Blender or the driver that the GPU was faster than the CPU, or significantly faster than before. Here's the numbers you mentioned above for upgrading GPU drivers:
I don't understand this.
The fact is that some CPUs are faster than certain GPUs. If this is just a thread commenting on that, I'm not sure its relevant to Blender development.
Hi Brian,
thanks for helping, basically 3.4.1 works better than the newer one. But as you said probably can be also that CPU has 6 core, 12 threads and gpu is around 7 I think. In general I notice that version of Blender use less vram compare to previous, but I know that can change because it's in beta now. I will test again when will become official to see more improvements. From the video that I sent to the other developer show the low usage of gpu in HIP.
Thanks in advance, sorry if the problem wasn't clear at the beginning.
Ok. So this could be an area of optimization (keep in mind that's a matter of priority), but I think this issue can be closed IMO and that can be handled somewhere else @PratikPB2123
@BrianSavery , according to reporter, GPU rendering in 3.4 took ~2 minutes whereas it takes ~3:30 minutes in 3.5 for the same scene. Based on that I suspect some changes in cycles code might have affected the performance. If this is the case then I think we should handle it on bug tracker.
I agree that discussion is quite less readable.
@Gioxyer , I'd say file a new report with necessary information (add blend file, show comparison of only "CPU", "GPU" rendering for both 3.4 and 3.5)