有没有办法关闭JIT编译器，这样做是否会对性能产生影响? [英] IS there a way to turn off JIT compiler and is there a performance impact by doing so?

问题描述

将Java程序进行JIT处理是什么意思?它会使执行速度提高很多吗?还是存在不是JIT处理的字节码?

What does it mean for a java program to be JIT'ed and does it make the execution a lot more faster or are there bytecodes which are not JIT'ed?

推荐答案

有两种方法可以禁用JIT

There is two ways to disable the JIT

-Djava.compiler=NONE 

否则这几乎永远不会编译任何东西

or this will almost never compile anything

-XX:CompileThreshold=2000000000

或在IBM JVM上

-nojit

禁用JIT可能会使您的代码变慢很多，例如50倍，但并非总是如此.如果您花费大部分时间进行IO或GUI更新，则可能会发现它们没有什么区别.

Disabling the JIT can slow down your code a lot e.g. 50x but not always. If you spend most of your time doing IO or GUI updates you might find it makes little difference.

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