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Cycles: Properly default to Metal-RT off unless GPU is a M3 or newer #120299

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Sergey Sharybin merged 1 commits from Alaska/blender:default-to-metal-rt-off into main 2024-04-09 16:19:37 +02:00
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Alaska commented 2024-04-05 13:58:04 +02:00
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Ever since commit [1], use_metalrt_by_default will be True
if the GPU being used is not a M1 or M2 based system.
The intention of this was to enable MetalRT by default for
M3 and newer devices that have hardware for ray traversal.

However the side effect of this change was that all AMD GPUs would
have use_metalrt_by_default set to True. Which appears to be the
main culprit causing crashes on older AMD GPUs in #120126.
Since these GPUs don't support MetalRT.

This commit fixes this issue by only setting
use_metalrt_by_default to True if the GPU is not M1 or M2 based,
and the GPU is Apple Silicon based. Which equates to M3 or newer.
Which is the original intent of this code.

This resolves the issue where AMD GPUs were being told to use MetalRT
by default, when they shouldn't be.

[1] 322a2f7b12

Ever since commit [1], `use_metalrt_by_default` will be True if the GPU being used is not a M1 or M2 based system. The intention of this was to enable MetalRT by default for M3 and newer devices that have hardware for ray traversal. However the side effect of this change was that all AMD GPUs would have `use_metalrt_by_default` set to True. Which appears to be the main culprit causing crashes on older AMD GPUs in #120126. Since these GPUs don't support MetalRT. This commit fixes this issue by only setting `use_metalrt_by_default` to True if the GPU is not M1 or M2 based, and the GPU is Apple Silicon based. Which equates to M3 or newer. Which is the original intent of this code. This resolves the issue where AMD GPUs were being told to use MetalRT by default, when they shouldn't be. [1] 322a2f7b12bba610a70df3af90e236d0c0ef03f6
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Alaska added the
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Alaska added 1 commit 2024-04-05 13:58:13 +02:00
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2f6048c298 Default to turning Metal-RT off unless the device is a M3 or newer. 
This may fix issues with crashes on some AMD GPUs
Alaska requested review from Sergey Sharybin 2024-04-05 13:58:27 +02:00
Alaska requested review from Brecht Van Lommel 2024-04-05 13:58:34 +02:00
Alaska changed title from Cycles: Default to Metal-RT off unless the device is a M3 or newer to Cycles: Properly default to Metal-RT off unless GPU is a M3 or newer 2024-04-05 14:06:37 +02:00
Alaska added this to the Render & Cycles project 2024-04-06 14:58:34 +02:00
Alaska commented 2024-04-08 01:19:26 +02:00
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It seems this pull request also fixes the performance regression seen on Vega II reported in #120006

I don't believe Vega II officially supports MetalRT, so I assume the performance regression mostly comes from MetalRT being a bit broken/slow on that hardware.

It seems this pull request also fixes the performance regression seen on Vega II reported in #120006 I don't believe Vega II officially supports MetalRT, so I assume the performance regression mostly comes from MetalRT being a bit broken/slow on that hardware.
Alaska commented 2024-04-09 09:39:15 +02:00
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There is another way of doing this change. Add a NOT_APPLE_SILICON item to the start of the AppleGPUArchitecture enum, then get MetalInfo::get_apple_gpu_architecture() to return NOT_APPLE_SILICON if the GPU vendor is not Apple. This way if any new code in the future makes use of get_apple_gpu_architecture for a similar purpose as the MetalRT check, it also benefits from this change.

If you would prefer this approach, let me know.

There is another way of doing this change. Add a `NOT_APPLE_SILICON` item to the start of the `AppleGPUArchitecture` enum, then get `MetalInfo::get_apple_gpu_architecture()` to return `NOT_APPLE_SILICON` if the GPU vendor is not Apple. This way if any new code in the future makes use of `get_apple_gpu_architecture` for a similar purpose as the MetalRT check, it also benefits from this change. If you would prefer this approach, let me know.
Sergey Sharybin commented 2024-04-09 11:48:01 +02:00
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@blender-bot package

@blender-bot package
Blender Bot commented 2024-04-09 11:49:23 +02:00
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Package build started. Download here when ready.

Package build started. [Download here](https://builder.blender.org/download/patch/PR120299) when ready.
Sergey Sharybin approved these changes 2024-04-09 16:15:08 +02:00
Sergey Sharybin left a comment
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Unfortunately, I can not verify this patch on the current main, as it renders all black (even prior to this patch). So, instead i've tested the patch with 4.1. The timing goes as following:

                                         4.1                  PR120299
attic                                    0.2652s              0.2052s
barbershop_interior                      0.4292s              0.3740s
bistro                                   0.4109s              0.2958s
bmw27                                    0.0211s              0.0212s
classroom                                0.2186s              0.2078s
fishy_cat                                0.0470s              0.0459s
junkshop                                 0.1703s              0.1669s
koro                                     0.2210s              0.0902s
monster                                  0.1018s              0.0873s
pabellon                                 0.0857s              0.1086s
shaderball                               2.2884s              2.4061s
sponza                                   0.0481s              0.0400s
spring                                   7.9825s              0.2572s
victor                                   0.3753s              0.3410s
wdas_cloud                               0.1644s              0.1648s

Overall I think it is safe to assume the patch does what it is expected to do on both reading the code, andtesting the behavior on actual hardware.

Unfortunately, I can not verify this patch on the current main, as it renders all black (even prior to this patch). So, instead i've tested the patch with 4.1. The timing goes as following: ``` 4.1 PR120299 attic 0.2652s 0.2052s barbershop_interior 0.4292s 0.3740s bistro 0.4109s 0.2958s bmw27 0.0211s 0.0212s classroom 0.2186s 0.2078s fishy_cat 0.0470s 0.0459s junkshop 0.1703s 0.1669s koro 0.2210s 0.0902s monster 0.1018s 0.0873s pabellon 0.0857s 0.1086s shaderball 2.2884s 2.4061s sponza 0.0481s 0.0400s spring 7.9825s 0.2572s victor 0.3753s 0.3410s wdas_cloud 0.1644s 0.1648s ``` Overall I think it is safe to assume the patch does what it is expected to do on both reading the code, andtesting the behavior on actual hardware.
Sergey Sharybin commented 2024-04-09 16:17:31 +02:00
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There is another way of doing this change. Add a NOT_APPLE_SILICON item to the start of the AppleGPUArchitecture enum, then get MetalInfo::get_apple_gpu_architecture() to return NOT_APPLE_SILICON if the GPU vendor is not Apple. This way if any new code in the future makes use of get_apple_gpu_architecture for a similar purpose as the MetalRT check, it also benefits from this change.

If you would prefer this approach, let me know.

It might indeed be better from code side, but it sounds to be a bigger (and hence more risky change) compared to what you originally proposed here. I think it is better to land the simple and more isolated version first, to allow an easier cherry-picking for 4.1.1.

> There is another way of doing this change. Add a `NOT_APPLE_SILICON` item to the start of the `AppleGPUArchitecture` enum, then get `MetalInfo::get_apple_gpu_architecture()` to return `NOT_APPLE_SILICON` if the GPU vendor is not Apple. This way if any new code in the future makes use of `get_apple_gpu_architecture` for a similar purpose as the MetalRT check, it also benefits from this change. > > If you would prefer this approach, let me know. It might indeed be better from code side, but it sounds to be a bigger (and hence more risky change) compared to what you originally proposed here. I think it is better to land the simple and more isolated version first, to allow an easier cherry-picking for 4.1.1.
Sergey Sharybin merged commit eff4fe24cf into main 2024-04-09 16:19:37 +02:00
Sergey Sharybin deleted branch default-to-metal-rt-off 2024-04-09 16:19:39 +02:00
Alaska commented 2024-04-10 02:03:43 +02:00
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It might indeed be better from code side, but it sounds to be a bigger (and hence more risky change) compared to what you originally proposed here. I think it is better to land the simple and more isolated version first, to allow an easier cherry-picking for 4.1.1.

Here is that code change: !120448

> It might indeed be better from code side, but it sounds to be a bigger (and hence more risky change) compared to what you originally proposed here. I think it is better to land the simple and more isolated version first, to allow an easier cherry-picking for 4.1.1. Here is that code change: !120448
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