use lua to implement rank for game
$ make$ lua test.lua$ lua stress_test.luaN 为 10w 时，我的机器上执行大概 1 秒多，当把 N 改成 50w 时，再执行就需要 50 秒多，为什么不是 5 秒多执行完呢（这里的时间是 2020年5月4日更新采用 memmove 前的测试记录）。obj 设置为 nil 强制垃圾回收，内存似乎只回收了一半，相比初始时还增加了很多内存，为什么回收后没有回到初始的内存呢。
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