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JVM运行时诊断工具 HouseMD
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Lunfu Zhong
June 04, 2013
Programming
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JVM运行时诊断工具 HouseMD
Lunfu Zhong
June 04, 2013
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Transcript
H ouse .M.D
聚石@taobao.com https://github.com/zhongl
他是一位 诊断 技艺精湛的医生
话说 诊断 技艺精湛的 程序员会是...
System.out.println("debugging");
LOG.debug("debugging");
信息打印总不全有木有? 又要改代码 > 编译 > 部署, 有木有? 多来几次想屎的心有木有?
工欲善其事,必先利其器
BTrace 神器降临, 一秒钟变高富帅!
Invocation Interception Profile JStack Context DTrace JMap JInfo Histogram Memory
File Socket
甜蜜中略带苦涩, 幸福中稍显忧伤
https://gist.github.com/zhongl/5625338 ClassNotFoundException
https://gist.github.com/zhongl/5625366 StackOverflowError
不用IDE写脚本很苦逼, 有木有? 总是要调整几次脚本才见效, 有木有? 多来几次尿都憋不住了, 有木有?
HouseMD 交互式命令行
$ housemd <jvm pid> INFO : Welcome to HouseMD 0.2.4
INFO : connection established on 54321 housemd> _
`trace TraceTarget.addOne`
`trace TraceTarget$C+` trace sub class
`trace -d TraceTarget$C+` get args and return
`trace -s TraceTarget$C+` get invocation StackTrace
Demo
http://github.com/csug/housemd
Tips & Traps
limit < 100 timeout < 3 `trace` with `-l -t`
trace unknown sub class instance `trace` with `Xxx+`
SimpleName conflict `trace` with `-p com.xxx`
INFO: Ended by error `last` for error ending
class loaded by who from where `loaded` for class info
port conflict `housemd -p <port>`
Emacs edit mode, power by jline2 `Ctrl + r` for
history search
Backspace do not work Linux mode in SecureCRT
chmod +w /tmp No echo cause by privilege
housemd -h > help [command] test cases issues More help
!!!
https://github.com/CSUG/HouseMD/wiki/DevGuideCN Contribute to HouseMD
Intro CSUG
Thanks
Scala In HouseMD TODO