JVM-Jinfo命令

jinfo

JVM Configuration info这个命令作用是实时查看和调整虚拟机运行参数。之前的jps -v口令只能查看到显示指定的参数，如果想要查看未被显示指定的参数的值就要使用jinfo口令。【JVM配置参数调整查看】

[root@localhost bin]# jinfo -help

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

参数

-flag：输出指定args参数的值

-flags：输出所有JVM参数的值

-sysprops：输出系统属性，等同于System.getProperties()

示例

[root@localhost bin]# jinfo -sysprops 24971 | more

Attaching to process ID 24971, please wait...

Debugger attached successfully.

Server compiler detected.

JVM version is 24.79-b02

java.runtime.name = Java(TM) SE Runtime Environment

java.vm.version = 24.79-b02

sun.boot.library.path = /usr/local/java/jdk1.7.0_79/jre/lib/amd64

shared.loader =

java.vendor.url = http://java.oracle.com/

java.vm.vendor = Oracle Corporation

path.separator = :

file.encoding.pkg = sun.io

java.vm.name = Java HotSpot(TM) 64-Bit Server VM

java.util.logging.config.file = /home/yuhuo-tomcat/tomcat2/conf/logging.properties

tomcat.util.buf.StringCache.byte.enabled = true

sun.os.patch.level = unknown

sun.java.launcher = SUN_STANDARD

user.country = CN

user.dir = /home/yuhuo-tomcat/tomcat2/bin

java.vm.specification.name = Java Virtual Machine Specification

java.runtime.version = 1.7.0_79-b15

org.apache.catalina.startup.TldConfig.jarsToSkip = tomcat7-websocket.jar

java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment

os.arch = amd64

1 2	`[root@localhost bin]# jinfo -flag MaxPermSize 24971` `-XX:MaxPermSize=85983232`

巴特西

JVM-Jinfo命令

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