ProcessFork plugin for SGLang ≥0.5 — RadixAttention prefix-share preserved across snapshot/restore.
Project description
processfork-sglang
ProcessFork plugin for SGLang ≥0.5.
Snapshot / fork / checkout endpoints that preserve RadixAttention
prefix-sharing across restores.
Install
pip install "processfork-sglang[sglang]"
Use
python -m sglang.launch_server \
--model meta-llama/Llama-3-8B \
--plugin processfork \
--deterministic-mode
Endpoints (matching the vLLM plugin's surface):
POST /processfork/snapshot
POST /processfork/fork
POST /processfork/checkout
POST /processfork/merge
The plugin maps SGLang's mem_pool.req_to_token_pool onto the
paged-batchinvariant-v1 LogicalSeq array, so prefix-sharing
survives across snapshot/restore.
Bit-exact restore requires --deterministic-mode.
Status
The trait surface and wire format are stable. The live FFI shim into
sglang.srt.mem_cache.RadixCache lands in v1.0.1 alongside the vLLM
adapter. Until then, the plugin's HTTP surface returns 501 with a
clear pointer to this README.
Release history Release notifications | RSS feed
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