---
title: "Qwen3-235B-A22B"
metatags:
  description: "Best Practice for Qwen3-235B-A22B on Ascend NPU"
---

<Note>
This page focuses on optimal configuration and benchmark results for Qwen3-235B-A22B on the Ascend NPU. For environment setup, model weight download, feature configuration, and deployment instructions, etc., see the [Qwen3-235B-A22B Model Tutorial](/docs/hardware-platforms/ascend-npus/model-tutorials/qwen3_235b_a22b).

On A3 each card has 2 dies, so `--tp-size` is twice the card count; see [Ascend NPU Reference](/docs/hardware-platforms/ascend-npus/ascend_npu_reference#hardware) for details.
</Note>

### Low Latency

| Model | Hardware | Cards | Deploy Mode | Dataset | TPOT | Quantization | Configuration |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Qwen3-235B-A22B | Atlas 800I A3 | 8 | PD Mixed | 11k+1.5k | 8ms | BF16 | [Optimal Configuration](#qwen3-235b-a22b-bf16-8p-in11k-out1k5-8ms) |

### High Throughput

| Model | Hardware | Cards | Deploy Mode | Dataset | TPOT | Quantization | Configuration |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Qwen3-235B-A22B | Atlas 800I A3 | 8 | PD Mixed | 3.5k+1.5k | 50.1ms | W8A8 INT8 | [Optimal Configuration](#qwen3-235b-a22b-w8a8-8p-in3k5-out1k5-50-1ms) |

## Optimal Configuration

<a id="single-node-pd-mixed" title="Referenced by external docs. Verify before removing."></a>

### Qwen3-235B-A22B BF16 8P IN11K OUT1K5 8ms

**Model**: Qwen3-235B-A22B

**Hardware**: Atlas 800I A3

**Cards**: 8

**Deploy Mode**: PD Mixed

**Quantization**: BF16

**Dataset**: 11k+1.5k

**TPOT**: 8ms

#### Model Deployment

```bash Command
# ============================================================
# Before running, update the following variables:
#   MODEL_PATH: path to the model weights directory
#   DRAFT_MODEL_PATH: path to the draft model weights directory
#   HCCL_SOCKET_IFNAME: network interface name for HCCL
#   GLOO_SOCKET_IFNAME: network interface name for Gloo
# ============================================================

MODEL_PATH=/path/to/model-weights
DRAFT_MODEL_PATH=/path/to/draft-model-weights

echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
sysctl -w vm.swappiness=0
sysctl -w kernel.numa_balancing=0
sysctl -w kernel.sched_migration_cost_ns=50000

unset https_proxy
unset http_proxy
unset HTTPS_PROXY
unset HTTP_PROXY
unset ASCEND_LAUNCH_BLOCKING

source /usr/local/Ascend/ascend-toolkit/set_env.sh
source /usr/local/Ascend/nnal/atb/set_env.sh

export GLOO_SOCKET_IFNAME=<network-interface>
export HCCL_BUFFSIZE=1600
export HCCL_OP_EXPANSION_MODE=AIV
export HCCL_SOCKET_IFNAME=<network-interface>
export PYTORCH_NPU_ALLOC_CONF=expandable_segments:True
export SGLANG_DISAGGREGATION_BOOTSTRAP_TIMEOUT=600
export SGLANG_ENABLE_OVERLAP_PLAN_STREAM=1

python3 -m sglang.launch_server \
    --model-path $MODEL_PATH \
    --host 127.0.0.1 --port 6688 \
    --trust-remote-code \
    --nnodes 1 \
    --node-rank 0 \
    --attention-backend ascend \
    --device npu \
    --max-running-requests 1 \
    --dtype bfloat16 \
    --chunked-prefill-size -1 \
    --max-prefill-tokens 16384 \
    --speculative-draft-model-quantization unquant \
    --speculative-algorithm EAGLE3 \
    --speculative-draft-model-path $DRAFT_MODEL_PATH \
    --speculative-num-steps 4 \
    --speculative-eagle-topk 1 \
    --speculative-num-draft-tokens 5 \
    --disable-radix-cache \
    --enable-dp-lm-head \
    --tp 16 \
    --mem-fraction-static 0.78 \
    --cuda-graph-bs 1 \
    --reasoning-parser qwen3 \
    --tool-call-parser qwen25
```

#### Benchmark

We tested it based on the `RANDOM` dataset.

```bash Command
python -m sglang.bench_serving \
    --dataset-name random \
    --backend sglang \
    --host 127.0.0.1 \
    --port 6688 \
    --max-concurrency 1 \
    --random-input-len 11000 \
    --random-output-len 1500 \
    --num-prompts 1 \
    --random-range-ratio 1
```

### Qwen3-235B-A22B W8A8 8P IN3K5 OUT1K5 50.1ms

**Model**: Qwen3-235B-A22B

**Hardware**: Atlas 800I A3

**Cards**: 8

**Deploy Mode**: PD Mixed

**Quantization**: W8A8 INT8

**Dataset**: 3.5k+1.5k

**TPOT**: 50.1ms

#### Model Deployment

```bash Command
# ============================================================
# Before running, update the following variables:
#   MODEL_PATH: path to the model weights directory
#   DRAFT_MODEL_PATH: path to the draft model weights directory
#   HCCL_SOCKET_IFNAME: network interface name for HCCL
#   GLOO_SOCKET_IFNAME: network interface name for Gloo
# ============================================================

MODEL_PATH=/path/to/model-weights
DRAFT_MODEL_PATH=/path/to/draft-model-weights

echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
sysctl -w vm.swappiness=0
sysctl -w kernel.numa_balancing=0
sysctl -w kernel.sched_migration_cost_ns=50000

unset https_proxy
unset http_proxy
unset HTTPS_PROXY
unset HTTP_PROXY
unset ASCEND_LAUNCH_BLOCKING

source /usr/local/Ascend/ascend-toolkit/set_env.sh
source /usr/local/Ascend/nnal/atb/set_env.sh

export GLOO_SOCKET_IFNAME=<network-interface>
export HCCL_BUFFSIZE=570
export HCCL_OP_EXPANSION_MODE=AIV
export HCCL_SOCKET_IFNAME=<network-interface>
export PYTORCH_NPU_ALLOC_CONF=expandable_segments:True
export SGLANG_DEEPEP_NUM_MAX_DISPATCH_TOKENS_PER_RANK=188416
export SGLANG_DISAGGREGATION_BOOTSTRAP_TIMEOUT=600
export SGLANG_ENABLE_OVERLAP_PLAN_STREAM=1
export SGLANG_ENABLE_SPEC_V2=1
export SGLANG_PREFILL_DELAYER_MAX_DELAY_PASSES=100
export SGLANG_SCHEDULER_DECREASE_PREFILL_IDLE=1

python3 -m sglang.launch_server \
    --model-path $MODEL_PATH \
    --host 127.0.0.1 --port 6688 \
    --trust-remote-code \
    --nnodes 1 \
    --node-rank 0 \
    --attention-backend ascend \
    --device npu \
    --max-running-requests 432 \
    --context-length 8192 \
    --dtype bfloat16 \
    --chunked-prefill-size 94208 \
    --max-prefill-tokens 458880 \
    --sampling-backend ascend \
    --ep-dispatch-algorithm static \
    --disable-radix-cache \
    --moe-a2a-backend ascend_fuseep \
    --fuseep-mode 2 \
    --speculative-algorithm EAGLE3 \
    --speculative-draft-model-path $DRAFT_MODEL_PATH \
    --speculative-num-steps 3 \
    --speculative-eagle-topk 1 \
    --speculative-num-draft-tokens 4 \
    --speculative-draft-model-quantization unquant \
    --tp 16 \
    --dp-size 16 \
    --enable-dp-attention \
    --enable-dp-lm-head \
    --mem-fraction-static 0.8 \
    --cuda-graph-bs 1 2 4 8 16 20 24 26 27 \
    --reasoning-parser qwen3 \
    --tool-call-parser qwen25
```

#### Benchmark

We tested it based on the `RANDOM` dataset.

```bash Command
python -m sglang.bench_serving \
    --dataset-name random \
    --backend sglang \
    --host 127.0.0.1 \
    --port 6688 \
    --max-concurrency 432 \
    --random-input-len 3500 \
    --random-output-len 1500 \
    --num-prompts 1728 \
    --random-range-ratio 1
```
