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Support Features on Ascend NPU

This section describes the basic functions and features supported by the Ascend NPU.If you encounter issues or have any questions, please open an issue.

If you want to know the meaning and usage of each parameter, click Server Arguments.

Model and tokenizer

Argument Defaults Options Server supported
--model-path
--model		 None Type: str A2, A3
--tokenizer-path None Type: str A2, A3
--tokenizer-mode auto auto, slow A2, A3
--tokenizer-worker-num 1 Type: int A2, A3
--skip-tokenizer-init False bool flag (set to enable) A2, A3
--load-format auto auto, safetensors A2, A3
--model-loader-
extra-config		 {} Type: str A2, A3
--trust-remote-code False bool flag (set to enable) A2, A3
--context-length None Type: int A2, A3
--is-embedding False bool flag (set to enable) A2, A3
--enable-multimodal None bool flag (set to enable) A2, A3
--revision None Type: str A2, A3
--model-impl auto auto, sglang,
transformers		 A2, A3

HTTP server

Argument Defaults Options Server supported
--host 127.0.0.1 Type: str A2, A3
--port 30000 Type: int A2, A3
--skip-server-warmup False bool flag (set to enable) A2, A3
--warmups None Type: str A2, A3
--nccl-port None Type: int A2, A3
--fastapi-root-path None Type: str A2, A3
--grpc-mode False False Planned

Quantization and data type

Argument Defaults Options Server supported
--dtype auto auto,
float16,
bfloat16		 A2, A3
--quantization None modelslim A2, A3
--quantization-param-path None Type: str Special For GPU
--kv-cache-dtype auto auto A2, A3
--enable-fp32-lm-head False bool flag
(set to enable)		 A2, A3
--modelopt-quant None Type: str Special For GPU
--modelopt-checkpoint-
restore-path		 None Type: str Special For GPU
--modelopt-checkpoint-
save-path		 None Type: str Special For GPU
--modelopt-export-path None Type: str Special For GPU
--quantize-and-serve False bool flag
(set to enable)		 Special For GPU
--rl-quant-profile None Type: str Special For GPU

Memory and scheduling

Argument Defaults Options Server supported
--mem-fraction-static None Type: float A2, A3
--max-running-requests None Type: int A2, A3
--prefill-max-requests None Type: int A2, A3
--max-queued-requests None Type: int A2, A3
--max-total-tokens None Type: int A2, A3
--chunked-prefill-size None Type: int A2, A3
--max-prefill-tokens 16384 Type: int A2, A3
--schedule-policy fcfs lpm, fcfs A2, A3
--enable-priority-
scheduling		 False bool flag
(set to enable)		 A2, A3
--schedule-low-priority-
values-first		 False bool flag
(set to enable)		 A2, A3
--priority-scheduling-
preemption-threshold		 10 Type: int A2, A3
--schedule-conservativeness 1.0 Type: float A2, A3
--page-size 128 Type: int A2, A3
--swa-full-tokens-ratio 0.8 Type: float Planned
--disable-hybrid-swa-memory False bool flag
(set to enable)		 Planned
--radix-eviction-policy lru lru,
lfu		 A2, A3
--enable-prefill-delayer False bool flag
(set to enable)		 A2, A3
--prefill-delayer-max-delay-passes 30 Type: int A2, A3
--prefill-delayer-token-usage-low-watermark None Type: float A2, A3
--prefill-delayer-forward-passes-buckets None List[float] A2, A3
--prefill-delayer-wait-seconds-buckets None List[float] A2, A3
--abort-on-priority-
when-disabled		 False bool flag
(set to enable)		 A2, A3
--enable-dynamic-chunking False bool flag
(set to enable)		 Experimental

Runtime options

Argument Defaults Options Server supported
--device None Type: str A2, A3
--tensor-parallel-size
--tp-size		 1 Type: int A2, A3
--pipeline-parallel-size
--pp-size		 1 Type: int; Currently 2 not supported Experimental
--attention-context-parallel-size
--attn-cp-size		 1 Type: int; must be equal to --tp-size A2, A3
--moe-data-parallel-size
--moe-dp-size		 1 Type: int Planned
--pp-max-micro-batch-size None Type: int Experimental
--pp-async-batch-depth None Type: int Experimental
--stream-interval 1 Type: int A2, A3
--incremental-streaming-output False bool flag (set to enable) A2, A3
--random-seed None Type: int A2, A3
--constrained-json-
whitespace-pattern		 None Type: str A2, A3
--constrained-json-
disable-any-whitespace		 False bool flag (set to enable) A2, A3
--watchdog-timeout 300 Type: float A2, A3
--soft-watchdog-timeout 300 Type: float A2, A3
--dist-timeout None Type: int A2, A3
--download-dir None Type: str A2, A3
--model-checksum None Type: str Planned
--base-gpu-id 0 Type: int A2, A3
--gpu-id-step 1 Type: int A2, A3
--sleep-on-idle False bool flag (set to enable) A2, A3

Logging

Argument Defaults Options Server supported
--log-level info Type: str A2, A3
--log-level-http None Type: str A2, A3
--log-requests False bool flag
(set to enable)		 A2, A3
--log-requests-level 2 0, 1, 2, 3 A2, A3
--log-requests-format text text, json A2, A3
--crash-dump-folder None Type: str A2, A3
--enable-metrics False bool flag
(set to enable)		 A2, A3
--enable-metrics-for-
all-schedulers		 False bool flag
(set to enable)		 A2, A3
--tokenizer-metrics-
custom-labels-header		 x-custom-labels Type: str A2, A3
--tokenizer-metrics-
allowed-custom-labels		 None List[str] A2, A3
--bucket-time-to-
first-token		 None List[float] A2, A3
--bucket-inter-token-
latency		 None List[float] A2, A3
--bucket-e2e-request-
latency		 None List[float] A2, A3
--collect-tokens-
histogram		 False bool flag
(set to enable)		 A2, A3
--prompt-tokens-buckets None List[str] A2, A3
--generation-tokens-buckets None List[str] A2, A3
--gc-warning-threshold-secs 0.0 Type: float A2, A3
--decode-log-interval 40 Type: int A2, A3
--enable-request-time-
stats-logging		 False bool flag
(set to enable)		 A2, A3
--kv-events-config None Type: str Special for GPU
--enable-trace False bool flag
(set to enable)		 A2, A3
--oltp-traces-endpoint localhost:4317 Type: str A2, A3
--log-requests-target None Type: str A2, A3
--uvicorn-access-log-exclude-prefixes [] List[str] A2, A3

RequestMetricsExporter configuration

Argument Defaults Options Server supported
--export-metrics-to-
file		 False bool flag
(set to enable)		 A2, A3
--export-metrics-to-
file-dir		 None Type: str A2, A3

API related

Argument Defaults Options Server supported
--api-key None Type: str A2, A3
--admin-api-key None Type: str A2, A3
--served-model-name None Type: str A2, A3
--weight-version default Type: str A2, A3
--chat-template None Type: str A2, A3
--hf-chat-template-name None Type: str A2, A3
--completion-template None Type: str A2, A3
--enable-cache-report False bool flag
(set to enable)		 A2, A3
--reasoning-parser None deepseek-r1
deepseek-v3
glm45
gpt-oss
kimi
qwen3
qwen3-thinking
step3		 A2, A3
--tool-call-parser None llama3
pythonic
qwen
qwen3_coder		 A2, A3
--sampling-defaults model openai, model A2, A3

Data parallelism

Argument Defaults Options Server supported
--data-parallel-size
--dp-size		 1 Type: int A2, A3
--load-balance-method auto auto,
round_robin,
follow_bootstrap_room,
total_requests,
total_tokens		 A2, A3

Multi-node distributed serving

Argument Defaults Options Server supported
--dist-init-addr
--nccl-init-addr		 None Type: str A2, A3
--nnodes 1 Type: int A2, A3
--node-rank 0 Type: int A2, A3

Model override args

Argument Defaults Options Server supported
--json-model-override-
args		 {} Type: str A2, A3
--preferred-sampling-
params		 None Type: str A2, A3

LoRA

Argument Defaults Options Server supported
--enable-lora False Bool flag
(set to enable)		 A2, A3
--enable-lora-overlap-loading False Bool flag
(set to enable)		 A2, A3
--max-lora-rank None Type: int A2, A3
--lora-target-modules None all A2, A3
--lora-paths None Type: List[str] /
JSON objects		 A2, A3
--max-loras-per-batch 8 Type: int A2, A3
--max-loaded-loras None Type: int A2, A3
--lora-eviction-policy lru lru,
fifo		 A2, A3
--lora-backend csgmv triton,
csgmv,
ascend,
torch_native		 A2, A3
--max-lora-chunk-size 16 16, 32,
64, 128		 Special for GPU

Kernel Backends (Attention, Sampling, Grammar, GEMM)

Argument Defaults Options Server supported
--attention-backend None ascend A2, A3
--prefill-attention-backend None ascend A2, A3
--decode-attention-backend None ascend A2, A3
--sampling-backend None pytorch,
ascend		 A2, A3
--grammar-backend None xgrammar A2, A3
--mm-attention-backend None ascend_attn A2, A3
--dsa-prefill-backend flashmla_sparse flashmla_sparse,
flashmla_decode,
fa3,
tilelang,
aiter		 Special for GPU
--dsa-decode-backend fa3 flashmla_prefill,
flashmla_kv,
fa3,
tilelang,
aiter		 Special for GPU
--fp8-gemm-backend auto auto,
deep_gemm,
flashinfer_trtllm,
flashinfer_cutlass,
flashinfer_deepgemm,
cutlass,
triton,
aiter		 Special for GPU
--disable-flashinfer-
autotune		 False bool flag
(set to enable)		 Special for GPU

Speculative decoding

Argument Defaults Options Server supported
--speculative-algorithm None EAGLE3,
NEXTN		 A2, A3
--speculative-draft-model-path
--speculative-draft-model		 None Type: str A2, A3
--speculative-draft-model-
revision		 None Type: str,
branch name,
tag name,
commit id		 A2, A3
--speculative-draft-load-format auto auto,
dummy		 A2, A3
--speculative-num-steps None Type: int A2, A3
--speculative-eagle-topk None Type: int A2, A3
--speculative-num-draft-tokens None Type: int A2, A3
--speculative-accept-
threshold-single		 1.0 Type: float Special for GPU
--speculative-accept-
threshold-acc		 1.0 Type: float Special for GPU
--speculative-token-map None Type: str A2, A3
--speculative-attention-
mode		 prefill prefill,
decode		 A2, A3
--speculative-moe-runner-
backend		 None auto A2, A3
--speculative-moe-a2a-
backend		 None ascend_fuseep A2, A3
--speculative-draft-attention-backend None ascend A2, A3
--speculative-draft-model-quantization None unquant A2, A3

Ngram speculative decoding

Argument Defaults Options Server supported
--speculative-ngram-
min-match-window-size		 1 Type: int Experimental
--speculative-ngram-
max-match-window-size		 12 Type: int Experimental
--speculative-ngram-
min-bfs-breadth		 1 Type: int Experimental
--speculative-ngram-
max-bfs-breadth		 10 Type: int Experimental
--speculative-ngram-
match-type		 BFS BFS,
PROB		 Experimental. BFS uses recency-based expansion; PROB uses frequency-based expansion.
--speculative-ngram-
max-trie-depth		 18 Type: int Experimental
--speculative-ngram-
capacity		 10000000 Type: int Experimental

Expert parallelism

Argument Defaults Options Server supported
--expert-parallel-size
--ep-size
--ep		 1 Type: int A2, A3
--moe-a2a-backend none none,
deepep,
ascend_fuseep(It is incompatible with eplb)		 A2, A3
--moe-runner-backend auto auto, triton A2, A3
--flashinfer-mxfp4-
moe-precision		 default default,
bf16		 Special for GPU
--enable-flashinfer-
allreduce-fusion		 False bool flag
(set to enable)		 Special for GPU
--deepep-mode auto normal,
low_latency,
auto		 A2, A3
--deepep-config None Type: str Special for GPU
--ep-num-redundant-experts 0 Type: int A2, A3
--ep-dispatch-algorithm None static,
dynamic,
fake		 A2, A3
--init-expert-location trivial trivial,
<path.pt>,
<path.json>,
<json_string>		 A2, A3
--enable-eplb False bool flag
(set to enable)		 A2, A3
--eplb-algorithm deepseek auto,
deepseek		 A2, A3
--eplb-rebalance-num-iterations 1000 Type: int A2, A3
--eplb-rebalance-layers-
per-chunk		 None Type: int A2, A3
--eplb-min-rebalancing-
utilization-threshold		 1.0 Type: float A2, A3
--expert-distribution-
recorder-mode		 None stat,
stat_approx,
per_pass,
per_token		 A2, A3
--expert-distribution-
recorder-buffer-size		 None Type: int A2, A3
--enable-expert-distribution-
metrics		 False bool flag (set to enable) A2, A3
--moe-dense-tp-size None 1 A2, A3
--elastic-ep-backend None none, mooncake Special for GPU
--mooncake-ib-device None Type: str Special for GPU

Mamba Cache

Argument Defaults Options Server supported
--max-mamba-cache-size None Type: int A2, A3
--mamba-ssm-dtype float32 float32,
bfloat16,
float16		 A2, A3
--mamba-full-memory-ratio 0.9 Type: float A2, A3
--mamba-scheduler-strategy auto auto,
no_buffer,
extra_buffer		 A2, A3
--mamba-track-interval 256 Type: int A2, A3

Hierarchical cache

Argument Defaults Options Server supported
--enable-hierarchical-
cache		 False bool flag
(set to enable).
Currently, mamba cache is not supported.		 A2, A3
--hicache-ratio 2.0 Type: float A2, A3
--hicache-size 0 Type: int A2, A3
--hicache-write-policy write_through Currently only write_back supported A2, A3
--hicache-io-backend kernel kernel_ascend,
direct		 A2, A3
--hicache-mem-layout layer_first page_first_direct,
page_first_kv_split		 A2, A3
--hicache-storage-
backend		 None file A2, A3
--hicache-storage-
prefetch-policy		 best_effort best_effort,
wait_complete,
timeout		 Special for GPU
--hicache-storage-
backend-extra-config		 None Type: str Special for GPU

LMCache

Argument Defaults Options Server supported
--enable-lmcache False bool flag
(set to enable)		 Special for GPU

Offloading (must be used with --disable-cuda-graph)

Argument Defaults Options Server supported
--cpu-offload-gb 0 Type: int A2, A3
--offload-group-size -1 Type: int (DeepSeek only) A2, A3
--offload-num-in-group 1 Type: int (DeepSeek only) A2, A3
--offload-prefetch-step 1 Type: int (DeepSeek only) A2, A3
--offload-mode cpu cpu (DeepSeek only)
meta (DeepSeek only)
sharded_gpu (DeepSeek only, only support tp=1 dp>1)		 A2, A3

Args for multi-item scoring

Argument Defaults Options Server supported
--multi-item-scoring-delimiter None Type: int A2, A3

Optimization/debug options

Argument Defaults Options Server supported
--disable-radix-cache False bool flag
(set to enable)		 A2, A3
--cuda-graph-max-bs None Type: int A2, A3
--cuda-graph-bs None List[int] A2, A3
--disable-cuda-graph False bool flag
(set to enable)		 A2, A3
--disable-cuda-graph-
padding		 False bool flag
(set to enable)		 A2, A3
--enable-profile-
cuda-graph		 False bool flag
(set to enable)		 A2, A3
--enable-cudagraph-gc False bool flag
(set to enable)		 A2, A3
--enable-nccl-nvls False bool flag
(set to enable)		 Special for GPU
--enable-symm-mem False bool flag
(set to enable)		 Special for GPU
--disable-flashinfer-
cutlass-moe-fp4-allgather		 False bool flag
(set to enable)		 Special for GPU
--enable-tokenizer-
batch-encode		 False bool flag
(set to enable)		 A2, A3
--disable-tokenizer-
batch-decode		 False bool flag
(set to enable)		 A2, A3
--disable-custom-
all-reduce		 False bool flag
(set to enable)		 Special for GPU
--enable-mscclpp False bool flag
(set to enable)		 Special for GPU
--enable-torch-
symm-mem		 False bool flag
(set to enable)		 Special for GPU
--disable-overlap
-schedule		 False bool flag
(set to enable)		 A2, A3
--enable-mixed-
chunk		 False bool flag
(set to enable)		 A2, A3
--enable-dp-attention False bool flag
(set to enable)		 A2, A3
--enable-dp-lm-head False bool flag
(set to enable)		 A2, A3
--enable-two-
batch-overlap		 False bool flag
(set to enable)		 Planned
--enable-single-
batch-overlap		 False bool flag
(set to enable)		 A2, A3
--tbo-token-
distribution-threshold		 0.48 Type: float Planned
--enable-torch-
compile		 False bool flag
(set to enable)		 A2, A3
--enable-torch-
compile-debug-mode		 False bool flag
(set to enable)		 A2, A3
--enforce-piecewise-
cuda-graph		 False bool flag
(set to enable);
Currently, Llama-3.1-8B-Instruct and Qwen2.5-7B-Instruct models are supported.		 A2, A3
--piecewise-cuda-
graph-tokens		 None Type: JSON
list		 A2, A3
--piecewise-cuda-
graph-compiler		 eager eager A2, A3
--torch-compile-max-bs 32 Type: int A2, A3
--piecewise-cuda-
graph-max-tokens		 None Type: int A2, A3
--torchao-config `` Type: str Special for GPU
--enable-nan-detection False bool flag
(set to enable)		 A2, A3
--enable-p2p-check False bool flag
(set to enable)		 Special for GPU
--triton-attention-
reduce-in-fp32		 False bool flag
(set to enable)		 Special for GPU
--triton-attention-
num-kv-splits		 8 Type: int Special for GPU
--triton-attention-
split-tile-size		 None Type: int Special for GPU
--delete-ckpt-
after-loading		 False bool flag
(set to enable)		 A2, A3
--enable-memory-saver False bool flag
(set to enable)		 A2, A3
--enable-weights-
cpu-backup		 False bool flag
(set to enable)		 A2, A3
--enable-draft-weights-
cpu-backup		 False bool flag
(set to enable)		 A2, A3
--allow-auto-truncate False bool flag
(set to enable)		 A2, A3
--enable-custom-
logit-processor		 False bool flag
(set to enable)		 A2, A3
--flashinfer-mla-
disable-ragged		 False bool flag
(set to enable)		 Special for GPU
--disable-shared-
experts-fusion		 True bool flag
(set to enable)		 A2, A3
--disable-chunked-
prefix-cache		 True bool flag
(set to enable)		 A2, A3
--disable-fast-
image-processor		 False bool flag
(set to enable)		 A2, A3
--keep-mm-feature-
on-device		 False bool flag
(set to enable)		 A2, A3
--enable-return-
hidden-states		 False bool flag
(set to enable)		 A2, A3
--enable-return-
routed-experts		 False bool flag
(set to enable)		 A2, A3
--scheduler-recv-
interval		 1 Type: int A2, A3
--numa-node None List[int] A2, A3
--enable-deterministic-
inference		 False bool flag
(set to enable)		 Planned
--rl-on-policy-target None fsdp Planned
--enable-layerwise-
nvtx-marker		 False bool flag
(set to enable)		 Special for GPU
--enable-attn-tp-
input-scattered		 False bool flag
(set to enable)		 Experimental
--enable-dsa-prefill-
context-parallel		 False bool flag
(set to enable)		 A2, A3
--enable-fused-qk-
norm-rope		 False bool flag
(set to enable)		 Special for GPU

Dynamic batch tokenizer

Argument Defaults Options Server supported
--enable-dynamic-
batch-tokenizer		 False bool flag
(set to enable)		 A2, A3
--dynamic-batch-
tokenizer-batch-size		 32 Type: int A2, A3
--dynamic-batch-
tokenizer-batch-timeout		 0.002 Type: float A2, A3

Debug tensor dumps

Argument Defaults Options Server supported
--debug-tensor-dump-
output-folder		 None Type: str A2, A3
--debug-tensor-dump-
layers		 None List[int] A2, A3
--debug-tensor-dump-
input-file		 None Type: str A2, A3

PD disaggregation

Argument Defaults Options Server supported
--disaggregation-mode null null,
prefill,
decode		 A2, A3
--disaggregation-transfer-backend mooncake ascend A2, A3
--disaggregation-bootstrap-port 8998 Type: int A2, A3
--disaggregation-ib-device None Type: str Special for GPU
--disaggregation-decode-
enable-offload-kvcache		 False False A2, A3
--num-reserved-decode-tokens 512 Type: int A2, A3
--disaggregation-decode-
polling-interval		 1 Type: int A2, A3

Encode prefill disaggregation

Argument Defaults Options Server supported
--enable-adaptive-dispatch-to-encoder False bool flag
(set to enable adaptively dispatch)		 A2, A3
--encoder-only False bool flag
(set to launch an encoder-only server)		 A2, A3
--language-only False bool flag
(set to load weights for the language model only)		 A2, A3
--encoder-transfer-backend zmq_to_scheduler zmq_to_scheduler,
zmq_to_tokenizer,
mooncake		 A2, A3
--encoder-urls [] List[str]
(List of encoder server urls)		 A2, A3

Custom weight loader

Argument Defaults Options Server supported
--custom-weight-loader None List[str] A2, A3
--weight-loader-disable-
mmap		 False bool flag
(set to enable)		 A2, A3
--remote-instance-weight-
loader-seed-instance-ip		 None Type: str A2, A3
--remote-instance-weight-
loader-seed-instance-service-port		 None Type: int A2, A3
--remote-instance-weight-
loader-send-weights-group-ports		 None Type: JSON
list		 A2, A3
--remote-instance-weight-
loader-backend		 nccl transfer_engine,
nccl		 A2, A3
--remote-instance-weight-
loader-start-seed-via-transfer-engine		 False bool flag
(set to enable)		 Special for GPU

For PD-Multiplexing

Argument Defaults Options Server supported
--enable-pdmux False bool flag
(set to enable)		 Special for GPU
--pdmux-config-path None Type: str Special for GPU
--sm-group-num 8 Type: int Special for GPU

For Multi-Modal

Argument Defaults Options Server supported
--enable-broadcast-mm-
inputs-process		 False bool flag
(set to enable)		 A2, A3
--mm-process-config None Type: JSON / Dict A2, A3
--mm-enable-dp-encoder False bool flag
(set to enable)		 A2, A3
--limit-mm-data-per-request None Type: JSON / Dict A2, A3

For checkpoint decryption

Argument Defaults Options Server supported
--decrypted-config-file None Type: str A2, A3
--decrypted-draft-config-file None Type: str A2, A3
--enable-prefix-mm-cache False bool flag
(set to enable)		 A2, A3

Forward hooks

Argument Defaults Options Server supported
--forward-hooks None Type: JSON list A2, A3

Configuration file support

Argument Defaults Options Server supported
--config None Type: str A2, A3

Other Params

The following parameters are not supported because the third-party components that depend on are not compatible with the NPU, like Ktransformer, checkpoint-engine etc.

Argument Defaults Options
--checkpoint-engine-
wait-weights-
before-ready		 False bool flag (set to enable)
--kt-weight-path None Type: str
--kt-method AMXINT4 Type: str
--kt-cpuinfer None Type: int
--kt-threadpool-count 2 Type: int
--kt-num-gpu-experts None Type: int
--kt-max-deferred-
experts-per-token		 None Type: int

The following parameters have some functional deficiencies on community

Argument Defaults Options
--tool-server None Type: str
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