当一个文件描述符上数据准备好时，它无法立即响应。

It cannot respond to a file descriptor immediately when the data becomes ready.

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阻塞的系统调用，就拿读取来说，直到数据准备好的时候才会返回。

A blocking syscall, like a read will only return once data is available.

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如果一步计算依赖之前一步的计算结果，那么芯片的大部分都要中断，以等待数据准备好。因此速度上的优势就失去了。

If one calculation relies on the results of a previous one, then much of the chip will sit idle until that result is ready and the speed advantage will be lost.

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