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SGLang and vLLM, the two major LLM serving engines, have attempted to enforce deterministic inference but face fundamental challenges due to floating-point non-associativity in GEMM kernels, which cau…

A bug is a violation of a specification, and no specification exists that prefix caching's variable logits violate, according to an analysis of vLLM and SGLang issues. The vLLM PR #34046 adds an opt-i…