A Walkthrough of nano-vllm

Recently, I&rsquo;ve been delving into the architecture of production-grade inference engines. While projects like vLLM and SGLang are crazy sophisticated, their complexity can make detailed code tracing difficult. Over the holidays, I came across nano-vllm—a tightly scoped codebase that still delivers end-to-end support for Page Attention and scheduling. I took a deep dive into its internals and…