This PR is based on top of
[#23569](https://github.com/vllm-project/vllm/pull/23569) and
[#24219](https://github.com/vllm-project/vllm/pull/24219).
### What this PR does / why we need it?
This PR allows the model runner to function asynchronously when using
async scheduling. This allows full overlap of the cpu operations
(including prepare_inputs) and the model forward pass. This diff is
functional and does not support speculative decoding, PP, or guided
decoding.
Expected speedup is 5-10% over the current async scheduling.
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
server
```
python -m vllm.entrypoints.openai.api_server --model=Qwen3-32B\
--trust-remote-code --enforce-eager \
--distributed-executor-backend=mp \
-tp=4 \
--port 8006 \
--max-model-len 32000 \
--block-size 128 \
--gpu-memory-utilization 0.99
```
client
```
python $TEST_PY --backend vllm --trust-remote-code --model Qwen3-32B \
--dataset-name random --random-input-len 2048 --random-output-len 2048 \
--ignore-eos\
--num-prompts 48 --max-concurrency 48 --request-rate inf --temperature 0 \
--metric-percentiles 90 --base-url http://localhost:8006 --save-result \
--result-dir $PROFILER_DIR
```
benchmark test based on Qwen3-32B TPOT result:
||forward async| scheduler async |sync|
|-|-|-|-|
|avg|41.73|41.86|44.20|
|improve0|0.3%|0|0|
|improve1|5.58%|0|0|
benchmark test based on Qwen2___5-VL-7B-Instruct TPOT result:
||forward async|sync|
|-|-|-|
|avg|23.22|29.16|
|improve|20.3%|0|
- vLLM version: main
- vLLM main:
e93f4cc9e3
Signed-off-by: jiangpeng36 <jiangpeng36@huawei.com>
Signed-off-by: Ronald1995 <ronaldautomobile@163.com>
Co-authored-by: jiangpeng36 <jiangpeng36@huawei.com>
Co-authored-by: Ronald1995 <ronaldautomobile@163.com>
2b9269b581