JVM命令jinfo

jinfo也是jvm中参与的一个命令，可以查看运行中jvm的全部参数，还可以设置部分参数。

格式

jinfo [ option ] pid

jinfo [ option ] executable core

jinfo [ option ] [server-id@]remote-hostname-or-IP

参数说明

pid 对应jvm的进程id

executable core 产生core dump文件

[server-id@]remote-hostname-or-IP 远程的ip或者hostname，server-id标记服务的唯一性id

option

no option 输出全部的参数和系统属性

-flag name 输出对应名称的参数

-flag [+|-]name 开启或者关闭对应名称的参数

-flag name=value 设定对应名称的参数

-flags 输出全部的参数

-sysprops 输出系统属性

实例

1 输出全部的参数和系统属性

[java@xftest0 ~]$ jinfo 43934

Attaching to process ID 43934, please wait...

Debugger attached successfully.

Server compiler detected.

JVM version is 20.45-b01

Java System Properties:

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

sun.boot.library.path = /usr/java/jdk1.6.0_45/jre/lib/amd64

java.vm.version = 20.45-b01

java.vm.vendor = Sun Microsystems Inc.

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

path.separator = :

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

file.encoding.pkg = sun.io

sun.java.launcher = SUN_STANDARD

env = dev

user.country = US

sun.os.patch.level = unknown

2 只输出参数

[java@xftest0 ~]$ jinfo -flags 43934

Attaching to process ID 43934, please wait...

Debugger attached successfully.

Server compiler detected.

JVM version is 20.45-b01

-Djava.awt.headless=true -Djava.net.preferIPv4Stack=true

刚才提到不是全部参数可以修改，只有部分，下面是可以修改的参数列表

SZ-sten:go sten$ java -XX:+PrintFlagsFinal -version |grep manageable

     intx CMSAbortablePrecleanWaitMillis            = 100             {manageable}

     intx CMSWaitDuration                           = 2000            {manageable}

     bool HeapDumpAfterFullGC                       = false           {manageable}

     bool HeapDumpBeforeFullGC                      = false           {manageable}

     bool HeapDumpOnOutOfMemoryError                = false           {manageable}

    ccstr HeapDumpPath                              =                 {manageable}

    uintx MaxHeapFreeRatio                          = 100             {manageable}

    uintx MinHeapFreeRatio                          = 0               {manageable}

     bool PrintClassHistogram                       = false           {manageable}

     bool PrintClassHistogramAfterFullGC            = false           {manageable}

     bool PrintClassHistogramBeforeFullGC           = false           {manageable}

     bool PrintConcurrentLocks                      = false           {manageable}

     bool PrintGC                                   = false           {manageable}

     bool PrintGCDateStamps                         = false           {manageable}

     bool PrintGCDetails                            = false           {manageable}

     bool PrintGCTimeStamps                         = false           {manageable}

命令 java -XX:+PrintFlagsFinal -version是输出全部的参数

巴特西

JVM命令jinfo

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