[Core] Add xxHash as a high-performance hash option for accelerating prefix caching#29163

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LuminolT wants to merge 11 commits intovllm-project:mainfrom

LuminolT:dev-xxhash

Commits on Nov 21, 2025

[FEAT] Add xxhash and xxhash_cbor algorithms for prefix caching and update tests
LuminolT
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[FEAT] Add micro benchmark for comparing built-in hash(), SHA-256, and xxHash from [23673](https://github.com/vllm-project/vllm/pull/23673)
LuminolT
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[FEAT] Ensure xxhash compatibility by checking for xxh3_128_digest attribute
LuminolT
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[FEAT] Enhance CLI argument parsing for prefix caching: add error handling for invalid hash algorithms and introduce xxhash support
LuminolT
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[Chore] Fix pre-commit formatting for hash benchmarks
LuminolT
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[Docs] Update benchmark documents for hashing algorithms of prefix caching
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[Feat] Add xxhash dependency for fast hashing in prefix caching
LuminolT
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Commits on Nov 22, 2025