jinfo

jinfo是jdk自带的命令，用来查看、修改jvm的配置参数。

[weblogic@host bin]$ jinfo
-bash: jinfo: command not found
[weblogic@host bin]$ ./jinfo
Usage:
    jinfo [option] <pid>
        (to connect to running process)
    jinfo [option] <executable <core>
        (to connect to a core file)
    jinfo [option] [server_id@]<remote server IP or hostname>
        (to connect to remote debug server)

where <option> is one of:
    -flag <name>         to print the value of the named VM flag
    -flag [+|-]<name>    to enable or disable the named VM flag
    -flag <name>=<value> to set the named VM flag to the given value
    -flags               to print VM flags
    -sysprops            to print Java system properties
    <no option>          to print both of the above
    -h | -help           to print this help message

查看jvm的参数

jinfo -flags process_id

查看java系统参数

jinfo -sysprops process_id