实际上，CPI是对运行一条指令需要多少时间的度量。
Essentially, CPI is a measure of how much time an instruction takes to run.
比如，一段小程序可以抹去所有的内存；一条简单的指令可以使主机停止运行。
A tiny program can clear all of memory. A single instruction can stop the machine.
但是大部分的新算法都是基于串行设计的，一次只能执行一个指令，下一条指令必须上一条执行完才可以运行。
But most new algorithms are designed to run on serial computers, which process instructions one after another.
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