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[V1][PP] Support pp with ray backend in V1 (#1800)

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### What this PR does / why we need it?
Support pipeline parallel with ray backend in V1Engine.

Fixes #1751

### Does this PR introduce _any_ user-facing change?
Users could specify ray as distributed backend when inferencing with pp

### How was this patch tested?
CI passed with new added test.


- vLLM version: v0.9.2
- vLLM main:
32142b3c62

---------

Signed-off-by: MengqingCao <cmq0113@163.com>
This commit is contained in:
Mengqing Cao
2025-07-23 14:52:52 +08:00
committed by GitHub
parent 9a3bdf2162
commit 3aa3b46bfe
5 changed files with 32 additions and 18 deletions
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6
vllm_ascend/attention/attention_v1.py
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@@ -396,8 +396,10 @@ class AscendAttentionBackendImpl(AttentionImpl):
if self.head_size == 192:
cu_seqlen_q = [0] + attn_metadata.query_lens.tolist()
cu_seqlen_k = [0] + attn_metadata.seq_lens.tolist()
cu_seqlen_q = torch.tensor(cu_seqlen_q, device="npu")
cu_seqlen_k = torch.tensor(cu_seqlen_k, device="npu")
cu_seqlen_q = torch.tensor(cu_seqlen_q,
device=query.device)
cu_seqlen_k = torch.tensor(cu_seqlen_k,
device=query.device)
cu_seqlen_q = torch.cumsum(cu_seqlen_q, dim=0)
cu_seqlen_k = torch.cumsum(cu_seqlen_k, dim=0)
max_seqlen_q = torch.max(attn_metadata.query_lens)