NVK¶
NVK is a Vulkan driver for NVIDIA GPUs.
Hardware support¶
NVK currently supports Turing (RTX 20XX and GTX 16XX) and later GPUs. Eventually, we plan to support as far back as Kepler (GeForce 600 and 700 series) GPUs but anything pre-Turing is currently disabled by default.
Kernel requirements¶
NVK requires at least a Linux 6.6 kernel
Conformance status:¶
NVK is a conformant Vulkan 1.3 implementation for all Turing (RTX 20XX and GTX 16XX) and later GPUs.
Debugging¶
Here are a few environment variable debug environment variables specific to NVK:
- NAK_DEBUG¶
a comma-separated list of named flags affecting the NVK back-end shader compiler:
print
Prints the shader at various stages of the compile pipeline
serial
Forces serial instruction execution; this is often useful for debugging or working around dependency bugs
spill
Forces the GPR file to a minimal size to test the spilling code
annotate
Adds extra annotation instructions to the IR to track information from various compile passes
- NVK_DEBUG¶
a comma-separated list of named flags, which do various things:
push
Dumps all pushbufs to stderr on submit. This requires that
push_sync
also be set.push_sync
Waits for submit to complete before continuing
zero_memory
Zeros all VkDeviceMemory objects upon creation
vm
Logs VM binds and unbinds
no_cbuf
Disables automatic promotion of UBOs to constant buffers
- NVK_I_WANT_A_BROKEN_VULKAN_DRIVER¶
If defined to
1
ortrue
, this will enable enumeration of all GPUs Kepler and later, including GPUs for which hardware support is poorly tested or completely broken. This is intended for developer use only.
Hardware Documentation¶
What little documentation we have can be found in the NVIDIA open-gpu-doc repository. The majority of our documentation comes in the form of class headers which describe the class state registers.