目錄

• 一、簡介
• 二、常用命令
• • 1、jinfo -flags pid : 打印當前指定java進程中已經設定的所有JVM參數信息
  • 2、jinfo -flag pid : 打印指定名稱的參數
  • 3、jinfo -flag [+|-] pid : 打開或關閉參數
  • 4、jinfo -sysprops pid : 打印當前java進程中設定的系統環境參數

一、簡介

jinfo 是 JDK 自帶的命令，可以用來查看正在運行的 java 應用程序的擴展參數，包括Java System屬性和JVM命令行參數；也可以動態的修改正在運行的 JVM 一些參數。當系統崩潰時，jinfo可以從core文件里面知道崩潰的Java應用程序的配置信息。

jinfo -help

輸出結果：

> 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

參數說明：

• -flag <name> ：打印指定名稱的參數。
• -flag [+|-]<name> ：打開或關閉參數。
• -flag <name>=<value> ：設置參數。
• -flags ：打印當前指定java進程中已經設定的所有JVM參數信息。
• -sysprops ：打印當前java進程中設定的系統環境參數。
• <no option> ：打印上面兩個選項。

二、常用命令

1、jinfo -flags pid : 打印當前指定java進程中已經設定的所有JVM參數信息

jinfo -flags 7663

輸出結果：

Attaching to process ID 7663, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.121-b13 Non-default VM flags: -XX:CICompilerCount=4 -XX:InitialHeapSize=268435456 -XX:MaxHeapSize=4294967296 -XX:MaxNewSize=1431306240 -XX:MinHeapDeltaBytes=524288 -XX:NewSize=89128960 -XX:OldSize=179306496 -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseFastUnorderedTimeStamps -XX:+UseParallelGC Command line: -javaagent:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar=49834:/Applications/IntelliJ IDEA.app/Contents/bin -Dfile.encoding=UTF-8

2、jinfo -flag pid : 打印指定名稱的參數

其中，<name> 不包含上圖的前綴 -XX: 等，不是 jinfo -flag -XX:NewSize 7663，而是 jinfo -flag NewSize 7663，不包含 -XX: 。

jinfo -flag NewSize 7663

輸出結果：

-XX:NewSize=89128960

3、jinfo -flag [+|-] pid : 打開或關閉參數

jinfo -flag +PrintGC 7663

執行上面命令后，執行如下命令查看結果：

jinfo -flags 7663

輸出結果：

從圖中我們可以看到參數已經打開。

4、jinfo -sysprops pid : 打印當前java進程中設定的系統環境參數

jinfo -sysprops 7663

輸出結果：

Attaching to process ID 7663, please wait... Debugger attached successfully. Server compiler detected. JVM version is 25.121-b13 java.runtime.name = Java(TM) SE Runtime Environment java.vm.version = 25.121-b13 sun.boot.library.path = /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib gopherProxySet = false 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 sun.os.patch.level = unknown sun.java.launcher = SUN_STANDARD user.country = CN user.dir = /Users/davis/workspace/intellij/cw-javaagent-demo java.vm.specification.name = Java Virtual Machine Specification java.runtime.version = 1.8.0_121-b13 java.awt.graphicsenv = sun.awt.CGraphicsEnvironment os.arch = x86_64 java.endorsed.dirs = /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/endorsed line.separator =java.io.tmpdir = /var/folders/5n/6g464jd97r13x39t5w69ybfr0000gn/T/ java.vm.specification.vendor = Oracle Corporation os.name = Mac OS X sun.jnu.encoding = UTF-8 java.library.path = /Users/davis/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:. java.specification.name = Java Platform API Specification java.class.version = 52.0 sun.management.compiler = HotSpot 64-Bit Tiered Compilers os.version = 10.15.5 http.nonProxyHosts = local|*.local|169.254/16|*.169.254/16 user.home = /Users/davis user.timezone = Asia/Shanghai java.awt.printerjob = sun.lwawt.macosx.CPrinterJob file.encoding = UTF-8 java.specification.version = 1.8 user.name = davis java.class.path = /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/deploy.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/cldrdata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/dnsns.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/jaccess.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/jfxrt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/localedata.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/nashorn.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/sunec.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/sunjce_provider.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/sunpkcs11.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext/zipfs.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/javaws.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/jfxswt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/management-agent.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/plugin.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/lib/ant-javafx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/lib/dt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/lib/javafx-mx.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/lib/jconsole.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/lib/packager.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/lib/sa-jdi.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/lib/tools.jar:/Users/davis/workspace/intellij/cw-javaagent-demo/target/classes:/Users/davis/maven/net/sourceforge/jtds/jtds/1.2.6/jtds-1.2.6.jar:/Users/davis/maven/jstl/jstl/1.2/jstl-1.2.jar:/Users/davis/maven/taglibs/standard/1.1.2/standard-1.1.2.jar:/Users/davis/maven/org/mybatis/mybatis/3.2.8/mybatis-3.2.8.jar:/Users/davis/maven/org/mybatis/mybatis-spring/1.2.2/mybatis-spring-1.2.2.jar:/Users/davis/maven/redis/clients/jedis/2.5.2/jedis-2.5.2.jar:/Users/davis/maven/org/apache/commons/commons-pool2/2.0/commons-pool2-2.0.jar:/Users/davis/maven/mysql/mysql-connector-java/5.1.39/mysql-connector-java-5.1.39.jar:/Users/davis/maven/org/springframework/spring-aop/4.1.1.RELEASE/spring-aop-4.1.1.RELEASE.jar:/Users/davis/maven/aopalliance/aopalliance/1.0/aopalliance-1.0.jar:/Users/davis/maven/org/springframework/spring-aspects/4.1.1.RELEASE/spring-aspects-4.1.1.RELEASE.jar:/Users/davis/maven/org/aspectj/aspectjweaver/1.8.2/aspectjweaver-1.8.2.jar:/Users/davis/maven/org/springframework/spring-beans/4.1.1.RELEASE/spring-beans-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-context/4.1.1.RELEASE/spring-context-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-context-support/4.1.1.RELEASE/spring-context-support-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-core/4.1.1.RELEASE/spring-core-4.1.1.RELEASE.jar:/Users/davis/maven/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar:/Users/davis/maven/org/springframework/spring-expression/4.1.1.RELEASE/spring-expression-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-instrument/4.1.1.RELEASE/spring-instrument-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-instrument-tomcat/4.1.1.RELEASE/spring-instrument-tomcat-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-jdbc/4.1.1.RELEASE/spring-jdbc-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-jms/4.1.1.RELEASE/spring-jms-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-messaging/4.1.1.RELEASE/spring-messaging-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-orm/4.1.1.RELEASE/spring-orm-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-oxm/4.1.1.RELEASE/spring-oxm-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-test/4.1.1.RELEASE/spring-test-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-tx/4.1.1.RELEASE/spring-tx-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-web/4.1.1.RELEASE/spring-web-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-webmvc/4.1.1.RELEASE/spring-webmvc-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-webmvc-portlet/4.1.1.RELEASE/spring-webmvc-portlet-4.1.1.RELEASE.jar:/Users/davis/maven/org/springframework/spring-websocket/4.1.1.RELEASE/spring-websocket-4.1.1.RELEASE.jar:/Users/davis/maven/commons-fileupload/commons-fileupload/1.3.1/commons-fileupload-1.3.1.jar:/Users/davis/maven/commons-io/commons-io/2.2/commons-io-2.2.jar:/Users/davis/maven/commons-dbcp/commons-dbcp/1.2.2/commons-dbcp-1.2.2.jar:/Users/davis/maven/commons-pool/commons-pool/1.4/commons-pool-1.4.jar:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar java.vm.specification.version = 1.8 sun.arch.data.model = 64 sun.java.command = com.cw.tsb.jvm.JVMTest java.home = /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre user.language = zh java.specification.vendor = Oracle Corporation awt.toolkit = sun.lwawt.macosx.LWCToolkit java.vm.info = mixed mode java.version = 1.8.0_121 java.ext.dirs = /Users/davis/Library/Java/Extensions:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/ext:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java sun.boot.class.path = /Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/sunrsasign.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_121.jdk/Contents/Home/jre/classes java.vendor = Oracle Corporation file.separator = / java.vendor.url.bug = http://bugreport.sun.com/bugreport/ sun.io.unicode.encoding = UnicodeBig sun.cpu.endian = little socksNonProxyHosts = local|*.local|169.254/16|*.169.254/16 ftp.nonProxyHosts = local|*.local|169.254/16|*.169.254/16 sun.cpu.isalist =

總結

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