Graphical Process Unit.

Check the list of attached graphic drivers

Specify which GPU should take priority

ACO

LLVMpipe

Mesa

RADV

Vulkan

Radeon Vulkan “RADV” driver has enabled the Valve-backed ACO shader compiler by default rather than AMD's official AMDGPU LLVM shader compiler back-end. It has feature parity with the AMDGPU LLVM back-end, RADV is now defaulting to using ACO in place of the AMDGPU LLVM shader compiler.

Vulkan tests https://github.com/SaschaWillems/Vulkan