processfork-vllm
ProcessFork plugin for vLLM ≥0.10. Adds OpenAI-compatible extended endpoints for snapshot / fork / checkout that walk vLLM's paged KV cache via the batch-invariant kernel mode.
Install
pip install "processfork-vllm[vllm]"
Use
vllm serve meta-llama/Llama-3-8B \
--enforce-deterministic \
--plugin processfork
Then:
POST /v1/processfork/snapshot { "name": "..." }
→ { "cid": "sha256:..." }
POST /v1/processfork/fork { "cid": "...", "n": 12 }
→ { "cids": ["sha256:..."] }
POST /v1/processfork/checkout { "cid": "..." }
→ { "ok": true }
Bit-exact restore requires --enforce-deterministic (stable since
vLLM 0.10). Without it, restore produces logits within ≤1e-4 of the
originals.
The wire format matches agent_docs/cache-layer.md —
paged-batchinvariant-v1. K and V pages are content-addressed
independently so a fork that mutates only V (one-token decode) shares
its K page with siblings.
Status
The trait surface and the paged-batchinvariant-v1 wire format are
stable. The live FFI shim into vllm.worker.cache_engine lands in
v1.0.1. Until then, the plugin's HTTP surface returns
501 Not Implemented with a clear pointer to this README.
1 maintainer
Metadata
1 maintainer
Release files for processfork-vllm 1.0.3
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | |
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| processfork_vllm-1.0.3.tar.gz | 9.4 kB | With provenance | Details |
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| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| processfork_vllm-1.0.3-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 17.6 kB
Release files / processfork_vllm-1.0.3.tar.gz
| Download URL | processfork_vllm-1.0.3.tar.gz |
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| Size | 9.4 kB |
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| Tags | Python 3 |
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