为什么Java代码在调试器中放慢速度？ [英] Why does Java code slow down in debugger?

问题描述

一些CPU密集型程序在运行调试器时会变得非常慢。为什么是这样？

目前我只是使用IntelliJ来逐步运行在JBoss中的代码。当我启动JBoss时，我使用这些选项：

  set JAVA_OPTS = -Xms512m -Xmx1024m -XX：MaxPermSize = 256m -Xdebug  - Xrunjdwp：transport = dt_socket，address = 5005，server = y，suspend = n％JAVA_OPTS％
  

是有办法加快执行力度？或者加快某些方法执行，我不需要逐步执行？

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更新：似乎我没有跨越/进入CPU密集程序（即：只需运行直到在例程之后设置断点），那么执行时间就好像不在调试器中。

解决方案

运行调试器时，某些CPU密集型程序会变得非常慢。为什么是这样？

因为启用调试时，JITter不会优化代码（通常不是） / p>

Some CPU intensive routines get dramatically slower when run through a debugger. Why is this?

Currently I'm just using IntelliJ to step through code running in JBoss. When I start JBoss, I use these options:

set JAVA_OPTS=-Xms512m -Xmx1024m -XX:MaxPermSize=256m -Xdebug -Xrunjdwp:transport=dt_socket,address=5005,server=y,suspend=n %JAVA_OPTS%

Is there a way to speed up the execution? Or to speed up certain method executions that I don't need to step through?

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Update: Seems if I don't step over/into the CPU intensive routines (ie: Just run til a breakpoint set right after the routine), then the execution time is as if not in a debugger.

解决方案

Some CPU intensive routines get dramatically slower when run through a debugger. Why is this?

Because the JITter won't optimize code as much (often, not at all) when debugging is enabled.

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