只测一个反复运行的小例子，可能看不到真实负载的性能成本
两者具体讨论哈希表与缓存。结论是要覆盖使用情境，不是微基准没有用。
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对照原文
But without running the data once, how do you know what
dimensions are inconsequential?when you go to time it you're timing the feature of interest which puts it in cash anyway