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Junyuan 6852a2e267 [feat] add LMCacheAscendConnector (#6882 )

### What this PR does / why we need it?

LMCache-Ascend is LMCache's solution on the Ascend platform and one of
the KVCache pooling solutions for Ascend. We hope to integrate
LMCache-Ascend into the vLLM-Ascend community as one of the official
KVCache pooling solutions for vLLM-Ascend.

We added a new LMCacheAscendConnector in vLLM-Ascend and registered it.

### Does this PR introduce _any_ user-facing change?

Users can specify the kvconnector using `--kv-transfer-config`, allowing
them to freely choose which kvconnector to use, without any user-facing
change.

### How was this patch tested?

Test by specifying `--kv-transfer-config
'{"kv_connector":"LMCacheAscendConnector","kv_role":"kv_both"}'`

- vLLM version: v0.16.0
- vLLM main:
15d76f74e2

---------

Signed-off-by: chloroethylene <jjysama@gmail.com>

2026-03-13 17:41:35 +08:00

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LMCache-Ascend Deployment Guide

Overview

LMCache-Ascend is a community maintained plugin for running LMCache on the Ascend NPU.

We provide a simple deployment guide here. For further info about deployment notes, please refer to LMCache-Ascend doc

Getting Started

Clone LMCache-Ascend Repo

Our repo contains a kvcache ops submodule for ease of maintenance, therefore we recommend cloning the repo with submodules.

cd /workspace
git clone --recurse-submodules https://github.com/LMCache/LMCache-Ascend.git

Docker

cd /workspace/LMCache-Ascend
docker build -f docker/Dockerfile.a2.openEuler -t lmcache-ascend:v0.3.12-vllm-ascend-v0.11.0-openeuler .

Once that is built, run it with the following cmd

DEVICE_LIST="0,1,2,3,4,5,6,7"
docker run -it \
    --privileged \
    --cap-add=SYS_RESOURCE \
    --cap-add=IPC_LOCK \
    -p 8000:8000 \
    -p 8001:8001 \
    --name lmcache-ascend-dev \
    -e ASCEND_VISIBLE_DEVICES=${DEVICE_LIST} \
    -e ASCEND_RT_VISIBLE_DEVICES=${DEVICE_LIST} \
    -e ASCEND_TOTAL_MEMORY_GB=32 \
    -e VLLM_TARGET_DEVICE=npu \
    -v /usr/local/Ascend/driver:/usr/local/Ascend/driver \
    -v /etc/localtime:/etc/localtime \
    -v /var/log/npu:/var/log/npu \
    -v /dev/davinci_manager:/dev/davinci_manager \
    -v /dev/devmm_svm:/dev/devmm_svm \
    -v /etc/ascend_install.info:/etc/ascend_install.info \
    -v /etc/hccn.conf:/etc/hccn.conf \
    lmcache-ascend:v0.3.12-vllm-ascend-v0.11.0-openeuler \
    /bin/bash

Manual Installation

Assuming your working directory is /workspace and vllm/vllm-ascend have already been installed.

Install LMCache Repo

NO_CUDA_EXT=1 pip install lmcache==0.3.12

Install LMCache-Ascend Repo

cd /workspace/LMCache-Ascend
python3 -m pip install -v --no-build-isolation -e .

Usage

We introduce a dynamic KVConnector via LMCacheAscendConnectorV1Dynamic, therefore LMCache-Ascend Connector can be used via the kv transfer config in the two following setting.

Online serving

python \
    -m vllm.entrypoints.openai.api_server \
    --port 8100 \
    --model /data/models/Qwen/Qwen3-32B \
    --trust-remote-code \
    --disable-log-requests \
    --block-size 128 \
    --kv-transfer-config '{"kv_connector":"LMCacheAscendConnector","kv_role":"kv_both"}'

Offline

ktc = KVTransferConfig(
        kv_connector="LMCacheAscendConnector",
        kv_role="kv_both"
    )

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