Porting the just-in-time compiler to new hardware platforms.

将即时编译器移植到新的硬件平台。

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For example, a just-in-time compiler can monitor which code is executed frequently and optimize just that code for speed.

例如，即时编译器可以监测一些被经常执行代码和，同时进行优化以提高速度。

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We've always had an ahead-of-time compiler, to produce pre-compiled Ruby code in.class files. But there were a few things missing.

我们一直都有提前编译器，用于以。class文件的形式来生成预编译的Ruby代码。

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> So this time I had the foresight to install this compiler but what I'm gonna do is this.

>，这次我非常有先见之明地,安装了这个编译器，但是我这次要做的却是。

哈佛公开课 - 计算机科学课程节选

- Well -- and I'll fix this blue next time -- I'm first telling the compiler I need access to the standard io library because printf is declared there.

哦！--下次我把这个字体颜色改成蓝色的-,我先告诉编译器--我需要使用,标准输入输出库,因为printf在那个库里面申明的。

哈佛公开课 - 计算机科学课程节选

Performance-wise, the winner is a pre-release version of Tower Technology's TowerJ compiler, which generates a native executable from pure Java code that runs almost 25 percent faster than the fastest Java interpreter, even when the interpreter has a just-in-time compiler.

CNN: New benchmark results show Java ready for prime time on servers