OpenGL & Vulkan

[danilw]

Short:

1. download this vk_spirv_mem.zip

2. open vk_spirv_mem.zip\vk_spirv_mem\shaders\spv\buf.frag.spv in Radeon GPU Analyzer (RGA)

3. look on RAM usage in Windows Task Manager, I have ~5.2Gb RAM usage for 1-2 min time by RGA or VKlauncher

instead of RGA, launch VKlauncher.exe RAM usage will be same, on shader first loading, when it loaded RAM become normal (~30Mb for that app)

Long:

Shader source code in vk_spirv_mem.zip\vk_spirv_mem\shaders\src\Buf0.glsl

This shader based on Shadertoy link few small modifications, original shader(from that shadertoy) use ~3Gb RAM in AMD Vulkan (this shader in OpenGL launcher)

OpenGL on same AMD hardware do no have this problem.(at all, it load/work fine)

Nvidia load this shader fine.(no RAM usage)

OS Windows 10, everything latest (1 week old)

Hardware AMD Vega 8 (Ryzen 3200) (I think it does not matter)

shader compiled with glslangValidator -V100 <files> command, nothing secial

Vulkan code of VKlauncher.exe are valid, and it does not matter because RGA show same result

[dorisyan]

Thanks for your report,

I will try to reproduce this issue.

[danilw]

Update with new shader code:

all linked code on this page do not have any validation errors

Download VK_amd_bug_test_55k_lines.zip

55k lines GLSL code (unroled original shader) that produce 4Mb SPIR-V file

Shader source in shaders/shadertoy/buf0.glsl

work fine:

in Nvidia OpenGL/Vulkan

in AMD in OpenGL

in AMD Vulkan:

used 6Gb ram to "load SPIR-V"

and crashes during execution

shader image is broken(bottom of image are broken)

[danilw · Accepted solution]

Ram usage problem Fixed in latest Adrenalin 21.5.1

shaders compiled fine now

problem with executing very large shader still exist(that 55k lines linked above), but maybe it hardware limitation idk