(cherry picked from commit 816375e0c1071d0696dfab1a1ce35674f9f37aa0)
### What this PR does / why we need it?
Suppose that you want to start a prefiller instance with npus `2,3`
only. So you start the instance with `ASCEND_RT_VISIBLE_DEVICES=2,3`.
The current programming will start two workers, whose ranks are `0` and
`1` respectedly. And they will pick the first and second ip addresses of
npus in the ranktable instead of the thirdth and forth ones. But
actually they are using card `2,3` and therefore they can not link with
remote instances when they attempt to transfer the KVCache.
Hence, at most 1 prefiller instance and at most 1 decoder instance can
work on a single machine since they always pick the first npu ip address
in the ranktable currently.
This pull request is proposed to fix the problem. This fix pick ips of
only those devices that are in `ASCEND_RT_VISIBLE_DEVICES` from the
ranktable.
### Does this PR introduce _any_ user-facing change?
If the user use ranktable generated by `gen_ranktable.sh`, they should
not face any change.
### How was this patch tested?
Qwen-0.6B 1P 1D, dp=2, `ASCEND_RT_VISIBLE_DEVICES=2,3` for prefiller and
`ASCEND_RT_VISIBLE_DEVICES=4,5` for decoder.
- vLLM version: v0.10.0
- vLLM main:
ad57f23f6a
Signed-off-by: CaveNightingale <cavenightingale@foxmail.com>
