kx
df1ee8070d
[feat][spec decode]Unified draft parallel ( #6766 )
...
### What this PR does / why we need it?
Implement a unified parallelized speculative decoding in VLLM
Ascend，which can simultaneously support parallel speculative inference
schemes such as Pard, P-Eagle, etc. refer to
https://github.com/vllm-project/vllm-ascend/pull/6565 and
https://github.com/vllm-project/vllm-ascend/pull/4078
### How was this patch tested?
run with parallel drafting script:
export target=/model/Llama-3.1-8B-Instruct
export draft=/model/PARD-Llama-3.2-1B
export CUDA_VISIBLE_DEVICES=6
export ASCEND_RT_VISIBLE_DEVICES=6
vllm serve $target \
--tensor-parallel-size 1 \
--max-model-len 4096 \
--no-enable-prefix-caching \
--port 8811 \
--speculative-config '{"model": "/model/PARD-Llama-3.2-1B", "method":
"draft_model", "num_speculative_tokens": 8, "parallel_drafting": true}'
base script:
export target=/model/Llama-3.1-8B-Instruct
export draft=/model/PARD-Llama-3.2-1B
export CUDA_VISIBLE_DEVICES=6
export ASCEND_RT_VISIBLE_DEVICES=6
vllm serve $target \
--tensor-parallel-size 1 \
--max-model-len 4096 \
--no-enable-prefix-caching \
--port 8811
benchmark script:
MAX_CONCURRENCY=1
NUM_PROMPTS=80
vllm bench serve --port 8811 \
--temperature 0 \
--model /model/Llama-3.1-8B-Instruct \
--backend openai-chat \
--endpoint /v1/chat/completions \
--dataset-name hf \
--dataset-path philschmid/mt-bench \
--num-prompts ${NUM_PROMPTS} \
--max-concurrency ${MAX_CONCURRENCY} \
--seed 1234
test results :
base(without spec decode): TTFT 79.46ms TPOT 26.99ms
output_tokens_throughput 36.75 tok/s
this pr(with parallel drafting): TTFT 72.24ms TPOT 13.45ms
output_tokens_throughput 72.98 tok/s
per-position acceptance(from position 0 to 7):
79.48%、56.93%、40%、27.90%、19.79%、14.25%、10.57%、7.61%.
----------------------------------------------------------------------
run on qwen3 model script ：
export target=/model/Qwen3-1.7B
export draft=/model/PARD-Qwen3-0.6B
export CUDA_VISIBLE_DEVICES=1
export ASCEND_RT_VISIBLE_DEVICES=1
vllm serve $target \
--tensor-parallel-size 1 \
--max-model-len 4096 \
--no-enable-prefix-caching \
--port 8811 \
--speculative-config '{"model": "/model/PARD-Qwen3-0.6B", "method":
"draft_model", "num_speculative_tokens": 8, "parallel_drafting": true}'
cc @NickJudyHvv
- vLLM version: v0.15.0
- vLLM main:
9562912ceaxiongkai123@cmbchina.com >
Signed-off-by: kx <1670186653@qq.com >
Signed-off-by: HF-001 <1670186653@qq.com >
Co-authored-by: 01267596 <xiongkai123@cmbchina.com >
2026-03-13 14:07:35 +08:00
