If you compile both versions, you'll find that the one that recomputes the length instead of storing it is smaller in size by several bytes.

如果你编译这两个版本，你会发现重新计算长度的版本比存储它的版本小几个字节。

youdao

The recalculation loop (which recomputes the time slices for the processes) and the goodness loop have been eliminated, and o (1) algorithms are used for wakeup and schedule .

重算循环(为进程重新计算时间片)和goodness循环已经被取消，o(1)算法用于wakeup和schedulee 。

youdao