jdk工具

作者: canezk | 来源:发表于2016-10-13 12:06 被阅读15次

    jinfo

    jinfo -flag CMSInitiatingOccupancyFraction 515
    -XX:CMSInitiatingOccupancyFraction=-1
    可以打印一些系统属性
    

    jstat

    jstat -gcutil 3359
      S0     S1     E      O      M     CCS    YGC     YGCT    FGC    FGCT     GCT
      0.00  25.14  40.51  71.72  96.27  94.77    107    1.268    16    0.490    1.757
    监控虚拟机的基本状况,内存,gc等情况
    

    jps

    -l 输出主类的全名
    -v 输出jvm参数
    -m 输出传递给main函数的参数
    -q 只输出本地虚拟机唯一id(lvmid)
    

    jmap

    jhat

    oracle官方参考

    The jhat command parses a java heap dump file and launches a webserver.
     jhat enables you to browse heap dumps using your favorite webbrowser. jhat 
    supports pre-designed queries (such as 'show all instances of a known class 
    "Foo"') as well as OQL (Object Query Language) - a SQL-like query 
    language to query heap dumps. Help on OQL is available from the OQL help page 
    shown by jhat. With the default port, OQL help is available at 
    http://localhost:7000/oqlhelp/
    

    可以看出,是对jmap dump的数据进行分析。

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