grout

A Qwen 3 inference engine written in Rust, build using cutile-rs.

Usage

1. Follow the installation guide of cutile-rs.
2. Configure your environment variables for cutile-rs.

• Set CUDA_TOOLKIT_PATH to your CUDA 13.2 install directory.

CUDA_TOOLKIT_PATH=/usr/local/cuda-13 cargo run --release -- --model <path-to-qwen3-model> --prompt "Hello, how are you?" --max-new-tokens 128

Options

Flag	Description
--model <path>	Path to model directory (safetensors + config.json)
--prompt <text>	Input prompt
--max-new-tokens <n>	Number of tokens to generate (default: 128)
--max-seq-len <n>	Override max sequence length
--sample	Enable sampling (default: greedy)
--raw-prompt	Skip chat template, use prompt as-is
--device-argmax	Run argmax on device
--profile	Print per-step profiling report

Environment Variables

Variable	Description
GROUT_CUDA_GRAPH_DECODE	Set to 1 to enable CUDA graph capture for decode
GROUT_CUBLAS_COMPUTE16	Set to 1 to use FP16 accumulation in cuBLAS
GROUT_CUBLAS_COMPUTE16_MAX_M	Max M dimension for FP16 compute
GROUT_CUBLAS_FAST_ALGO	cuBLAS algorithm selection
GROUT_ATTN_BN_DECODE	Attention block size for decode

License

Apache-2.0