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[Feature][MRV2][P/D] Support PCP KV transfer #16080

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Merged
Tflowers-0129 merged 2 commits into from
Sep 10, 2026
Merged

[Feature][MRV2][P/D] Support PCP KV transfer #16080

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bd83711
[Refactor][MRV2][P/D] Remove PCP KV sharding
li1how Sep 7, 2026
fe92635
[Feature][MRV2][P/D] Support PCP KV transfer
li1how Sep 9, 2026
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9 changes: 5 additions & 4 deletions docs/source/user_guide/feature_guide/context_parallel.md
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Expand Up @@ -19,10 +19,10 @@ PCP support is experimental and available only with ModelRunner V2. The followin

| Attention Backend | Basic PCP | Prefix Caching + PCP | Chunked Prefill + PCP | MLAPO + PCP | Speculative Decoding + PCP | P/D Disaggregation + PCP | Sequence Parallelism (SP) + PCP |
| --- | --- | --- | --- | --- | --- | --- | --- |
| MLA | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | 🟠 Partial compatibility (MTP, eager and `FULL_DECODE_ONLY`) | ❌ No compatibility | ❌ No compatibility |
| GQA | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | — Not applicable | 🟠 Partial compatibility (Eagle3, eager and `FULL_DECODE_ONLY`) | ❌ No compatibility | ❌ No compatibility |
| SFA | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | ❌ No compatibility | ❌ No compatibility | ❌ No compatibility | ❌ No compatibility |
| DSA | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | — Not applicable | 🟠 Partial compatibility (MTP and DSpark, eager and `FULL_DECODE_ONLY`) | ❌ No compatibility | ❌ No compatibility |
| MLA | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | 🟠 Partial compatibility (MTP, eager and `FULL_DECODE_ONLY`) | ✅ Full compatibility (`MooncakeConnectorV1`) | ❌ No compatibility |
| GQA | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | — Not applicable | 🟠 Partial compatibility (Eagle3, eager and `FULL_DECODE_ONLY`) | ✅ Full compatibility (`MooncakeConnectorV1`) | ❌ No compatibility |
| SFA | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | ❌ No compatibility | ❌ No compatibility | ✅ Full compatibility (`MooncakeConnectorV1`) | ❌ No compatibility |
| DSA | ✅ Full compatibility | ✅ Full compatibility | ✅ Full compatibility | — Not applicable | 🟠 Partial compatibility (MTP and DSpark, eager and `FULL_DECODE_ONLY`) | ✅ Full compatibility (`MooncakeHybridConnector`) | ❌ No compatibility |

- ✅ **Full compatibility**: The basic path or feature combination is supported.
- 🟠 **Partial compatibility**: The basic path or feature combination is supported with the stated limitations.
Expand Down Expand Up @@ -109,6 +109,7 @@ For either method, remove `--enforce-eager` and add the following option to use
#### Constraints

- PCP is supported only with ModelRunner V2.
- In P/D disaggregation, enable PCP only on the prefill (`kv_producer`) engine; the decode (`kv_consumer`) engine must use `prefill_context_parallel_size=1`.
- PCP speculative decoding supports MTP with MLA and DSA models, Eagle3 with
GQA models, and DSpark with DeepSeek-V4 DSA models.
- Draft sampling must use the greedy method.
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