2x GH200 for LLM inference, Part 4: DeepSeek V4 Flash - SGLang vs vLLM at 1M context

Introduction Part 1 measured this dual GH200 workstation as a memory system. Part 2 used those numbers on the preview DeepSeek V4 Flash checkpoint, where the interesting/painful part was getting multi-token prediction to run at all: a hand-written vLLM O-projection fallback, a config-propagation fix, and a narrow upstream PR. Part 3 then took the box to its limit with GLM-5.2 and expert offloa...