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jinfo(Configuration Info For Java)的作用是實時地查看和調整虛擬機的各項參數。使用jps -v 可以查看虛擬機啟動時顯式指定的參數列表，未被顯式指定的參數列表，可以通過jinfo -flags選項進行查詢，jinfo詳細用法如下：

[root@localhost?~]#?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

-sysprops：以鍵值對形式，打印Java的系統屬性，既把虛擬機進程的System.getProperties()內容打印出來

MacBook-Pro:~?coder$?jinfo?-sysprops?645 Attaching?to?process?ID?645,?please?wait... Debugger?attached?successfully. Server?compiler?detected. JVM?version?is?25.74-b02 java.vendor?=?Oracle?Corporation sun.java.launcher?=?SUN_STANDARD catalina.base?=?/usr/local/Cellar/tomcat/8.5.16_1/libexec sun.management.compiler?=?HotSpot?64-Bit?Tiered?Compilers sun.nio.ch.bugLevel?=? catalina.useNaming?=?true os.name?=?Mac?OS?X ... user.dir?=?/ line.separator?=?java.vm.name?=?Java?HotSpot(TM)?64-Bit?Server?VM file.encoding?=?UTF-8 java.specification.version?=?1.8

-flags：打印傳遞給虛擬機的命令行標識參數

[root@localhost?~]#?jinfo?-flags?4276 Attaching?to?process?ID?4276,?please?wait... Debugger?attached?successfully. Server?compiler?detected. JVM?version?is?25.151-b12 Non-default?VM?flags:?-XX:CICompilerCount=2?-XX:InitialHeapSize=62914560?-XX:MaxHeapSize=994050048?-XX:MaxNewSize=331350016?-XX:MinHeapDeltaBytes=524288?-XX:NewSize=20971520?-XX:OldSize=41943040?-XX:+UseCompressedClassPointers?-XX:+UseCompressedOops?-XX:+UseParallelGC? Command?line:

-flag name：打印指定的命令行標識符的名字和值

[root@localhost?~]#?jinfo?-flag?NewSize?4276 -XX:NewSize=20971520

-flag[+|-] name：啟用或禁用指定的boolean類型的命令行標識參數

-flag name=value：為給定的命令行標識參數設置指定的值

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