rob thijssen
1ebbe87651
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Stage 8d (new): port the Gated DeltaNet CUDA kernels from
EricLBuehler/mistral.rs to close the ~500x decode performance gap
we measured on Qwen3.6-27B TP-2 (~12s/token in our pure-candle path
vs ~37 T/s in mistralrs on the same hardware).
This commit lays the build infrastructure with zero behavioural
change. Subsequent commits (8d-2 .. 8d-5) wire each kernel into the
qwen3_5 architecture and TP variant.
Added:
- `crates/neuron/build.rs` — uses `cudaforge::KernelBuilder` to compile
every `src/cuda/*.cu` file into `libneuroncuda.a` under the `cuda`
feature, then links it + `cudart`. Mirrors mistralrs's
`mistralrs-core/build.rs` setup verbatim (same NVCC flag set, same
sm_<80 bf16 gate).
- `crates/neuron/src/cuda/gdn.cu` — five kernels ported verbatim from
upstream:
* `gated_delta_rule_recurrence` (V-tiled per-token decode)
* `chunked_gated_delta_rule_recurrence` (BT=64 chunked prefill)
* `causal_conv1d_update` (single-token conv decode)
* `causal_conv1d_full` (multi-token conv prefill)
* `fused_gdn_gating` (beta = sigmoid(b); g = -exp(A_log) *
softplus(a + dt_bias))
- `crates/neuron/src/cuda/gdn.rs` — Rust wrappers around the kernels,
cudarc::CudaSlice::device_ptr boilerplate identical to upstream.
- `crates/neuron/src/cuda/ffi.rs` — `extern "C"` decls (subset of
upstream's ffi.rs covering only the five GDN kernels; MoE / SSM /
top-k decls land here when we absorb those too).
- `crates/neuron/src/cuda/mod.rs` — re-exports + module docs.
Cargo wiring: `cudaforge` added as an optional build-dep, activated
by the `cuda` feature. CPU build is unchanged (the `cuda/` module is
fully `#[cfg(feature = "cuda")]`). The cuda feature build inside the
patched container compiles `gdn.cu` (1 of 1 kernels) and links
clean.
Licensing: upstream files preserve their MIT origin via per-file
comment banners pointing to the mistralrs path. No behaviour-relevant
edits to the .cu kernels — local diff against upstream is just the
banner. The `.rs` wrappers and `ffi.rs` subset are also from upstream;
their structure (module path `crate::cuda::ffi::*`) matches identically
so future kernel imports drop in unchanged.
CPU clippy + 32 lib tests pass; `cargo clippy --features cuda` clean
inside the runner container.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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