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The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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在例子中，单个请求占用载体线程的总时间其实只有几毫秒（执行非阻塞代码的时间），其他 350ms 都在等待。所以理论上，如果载体线程足够多（比如 Tomcat 默认有 200 个平台线程作为载体），就可以同时处理海量虚拟线程，吞吐量自然暴增。
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