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- # Qwen3.8-27B (BF16) — 1× DGX Spark / GB10 (sm_121), TP=1.
- #
- # Native BF16 dense 27B (52 GB). Quality reference baseline; the quantized
- # variants (FP8 / NVFP4 / Int4) are the speed candidates. Runs text + vision.
- #
- # Image: ghcr.io/timothystewart6/vllm-gb10:v0.27.1-gb10.2
- # vLLM 0.27.1, torch 2.13+cuda130, FlashInfer built from source,
- # instanttensor. Stock vLLM — supports the qwen3_5 arch + MTP.
- #
- # Model: Qwen/Qwen3.8-27B
- # https://huggingface.co/Qwen/Qwen3.8-27B
- # Dense 27B, 64 layers, hidden 5120, GQA (4 KV heads × 256), Gated
- # DeltaNet + Gated Attention hybrid. MTP-1. Native 262,144 ctx (YaRN to 1M).
- # Multimodal (vision tower, `language_model_only: False`).
- #
- # PREREQUISITES:
- # Weights cached on every node (dgx1 ~/.cache/huggingface → NAS):
- # huggingface-cli download Qwen/Qwen3.8-27B
- #
- # REFERENCE:
- # https://forums.developer.nvidia.com/t/qwen3-8-27b-mixedint4-autoround-optimized-for-a-single-dgx-spark/380248
- # https://forums.developer.nvidia.com/t/qwen3-8-27b-on-dual-sparks/380350
- # https://forums.developer.nvidia.com/t/qwen3-8-27b-at-34-38-tok-s-on-dgx-spark-open-source-one-command-setup-sglang-nvfp4-dspark/380257
- engine = "vllm"
- name = "Qwen3.8-27B (BF16)"
- docker_image = "ghcr.io/timothystewart6/vllm-gb10:v0.27.1-gb10.2"
- model = "Qwen/Qwen3.8-27B"
- required_nodes = 1
- tensor_parallel_size = 1
- pipeline_parallel_size = 1
- distributed_backend = "mp"
- shm_size = "32gb"
- entrypoint = ["vllm", "serve"]
- args = [
- # KV cache & memory
- "--kv-cache-dtype", "fp8",
- "--max-model-len", "262144",
- "--max-num-seqs", "6",
- "--max-num-batched-tokens", "8192",
- "--gpu-memory-utilization", "0.75",
- "--served-model-name", "qwen3.8-27b",
- # Engine backends (dense GQA — FlashInfer, not the DeepSeek MLA path)
- "--attention-backend", "flashinfer",
- # Compilation / perf
- "--optimization-level", "3",
- "--performance-mode", "throughput",
- # Chunked prefill + prefix caching
- "--enable-chunked-prefill",
- "--enable-prefix-caching",
- "--enable-flashinfer-autotune",
- # MTP speculative decoding (in-checkpoint draft, mtp_num_hidden_layers=1
- # cycled across steps)
- "--speculative-config", """
- '{"method":"mtp","num_speculative_tokens":5}'""",
- # Tokenizer / reasoning (Qwen3 family)
- "--tool-call-parser", "qwen3_xml",
- "--reasoning-parser", "qwen3",
- "--enable-auto-tool-choice",
- "--generation-config", "auto",
- "--default-chat-template-kwargs.preserve_thinking=true",
- # Proven generation defaults (thinking mode; Qwen3.8 model-card best
- # practices). repetition_penalty 1.0 = identity: accepted but never
- # deviates from no-op during req handling (DSpark/MLA bug caveat — see
- # findings doc for the DeepSeek path; irrelevant to dense Qwen).
- "--override-generation-config", """
- '{"temperature":1.0,"top_p":0.95,"top_k":20,"min_p":0.0,"presence_penalty":0.0,"repetition_penalty":1.0}'""",
- "--trust-remote-code",
- ]
- [env]
- # Offline mode — weights must be cached on each node
- HF_HUB_OFFLINE = "1"
- # Architecture
- TORCH_CUDA_ARCH_LIST = "12.1a"
- CUTE_DSL_ARCH = "sm_121a"
- OMP_NUM_THREADS = "4"
- # GPU memory management
- PYTORCH_CUDA_ALLOC_CONF = "expandable_segments:True"
- # GPU device isolation
- CUDA_VISIBLE_DEVICES = "0"
- CUDA_DEVICE_ORDER = "PCI_BUS_ID"
- CUDA_CACHE_MAXSIZE = "4294967296"
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