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lighttrace's Introduction

lightTrace

功能点

  1. 可以获取某个类的方法执行时间
  2. 代码中如果有system.gc的调用会打印出调用的堆栈

使用场景

应用整体响应时间长，但不知道方法是有多慢。一旦重启就再难复现。代码中有system.gc还不好排查，例如是第三方的包中调用。

使用方式

  1. 进入lightTrace目录下，可以查看到有Run.bat
  2. jps查看java进程id
  3. Run.bat pid 要查看方法的类，例如Run.bat 30232 Bean 表示进程号为30232的进程，类名里包含bean的类输出方法的执行时间。
  4. Run.bat pid 就只查看gc调用栈

注意

  1. 现在只提供了windows的脚本，如果linux就自己java执行吧
  2. 需要有JAVA_HOME的环境变量

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