GLM-5.1-CPU-NUMA4-AMXINT8

GLM-5.1-CPU-NUMA4-AMXINT8

zai-org/GLM-5.1 quantized to the AMXINT8 format for inference with sglang + ktransformers, packed specifically for inference on 4 NUMA nodes.

To run, please ensure that your CPU supports the AMX instruction set (Intel Xeon processor, Sapphire Rapids or newer), and make note of your NUMA node count. Install kt-kernal and sglang-kt following the official documentation.

Then, download the official weights of zai-org/GLM-5.1 (in either BF16 or FP8), as well as this CPU-optimized quantized model, and prepare your launch command:

PYTORCH_ALLOC_CONF=expandable_segments:True \
SGLANG_ENABLE_JIT_DEEPGEMM=0 \
python -m sglang.launch_server \
  --model /path/to/GLM-5.1-FP8 \
  --kt-method AMXINT8 \
  --kt-weight-path /path/to/GLM-5.1-CPU-NUMA4-AMXINT8 \
  --kt-cpuinfer 128 \
  --kt-threadpool-count 4 \
  --kt-num-gpu-experts 16 \
  --kt-max-deferred-experts-per-token 0 \
  --kt-expert-placement-strategy uniform \
  --trust-remote-code \
  --mem-fraction-static 0.98 \
  --served-model-name zai-org/GLM-5.1 \
  --enable-mixed-chunk \
  --tensor-parallel-size 1 \
  --enable-p2p-check \
  --disable-shared-experts-fusion \
  --chunked-prefill-size 4096 \
  --context-length 131072 \
  --max-total-tokens 131072 \
  --max-running-requests 1 \
  --attention-backend flashinfer \
  --fp8-gemm-backend cutlass \
  --kv-cache-dtype bf16 \
  --reasoning-parser glm45 \
  --tool-call-parser glm47

Notes:

• GlmMoeDsaForCausalLM requires at least transformers 5.2.0, which is not the default version pinned by sglang-kt at the time of writing
• Note that DSA (DeepSeek Sparse Attention) is not currently supported on non-enterprise GPU architectures, so attention will fall back to standard MLA with the specified --attention-backend
• --kt-cpuinfer should be set to the total number of physical CPU cores across all NUMA nodes
• --tensor-parallel-size 1 should be set to the number of GPUs
• The optimal choices for --attention-backend and --fp8-gemm-backend depend on the CUDA architecture of your GPUs - please check the sglang documentation
• --kt-num-gpu-experts, --mem-fraction-static, --chunked-prefill-size, --context-length, --max-total-tokens, and --max-running-requests should be adjusted depending on constraints of your hardware
• Please review the official kt-kernel documentation for details