内容简介:java-jvm-jinfo
jinfo:
1、输出 当前 java 进程启动的相关配置信息,包括各种各样的jvm参数
2、修改运行时的java 进程的opts
查看参数:
举例:
sudo jinfo 14855
输出:
Attaching to process ID 14855, please wait... Debugger attached successfully. Server compiler detected. JVM version is 24.45-b08 Java System Properties: java.runtime.name = Java(TM) SE Runtime Environment java.vm.version = 24.45-b08 sun.boot.library.path = /home/q/java/jdk1.7.0_45/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/q/www/projectA/conf/logging.properties tomcat.util.buf.StringCache.byte.enabled = true sun.os.patch.level = unknown sun.java.launcher = SUN_STANDARD user.country = US user.dir = /home/robot.walle java.vm.specification.name = Java Virtual Machine Specification java.runtime.version = 1.7.0_45-b18 java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment os.arch = amd64 java.endorsed.dirs = /home/q/tomcat/endorsed line.separator = java.io.tmpdir = /home/q/www/projectA/temp java.vm.specification.vendor = Oracle Corporation java.util.logging.manager = org.apache.juli.ClassLoaderLogManager java.naming.factory.url.pkgs = org.apache.naming os.name = Linux gym.cache = /home/q/www/projectA/cache sun.jnu.encoding = UTF-8 java.library.path = /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib sun.nio.ch.bugLevel = curator-dont-log-connection-problems = false java.class.version = 51.0 java.specification.name = Java Platform API Specification http.keepAlive = false sun.management.compiler = HotSpot 64-Bit Tiered Compilers os.version = 2.6.32-358.23.2.el6.x86_64 user.home = /home/tomcat user.timezone = PRC catalina.useNaming = true java.awt.printerjob = sun.print.PSPrinterJob file.encoding = UTF-8 java.specification.version = 1.7 catalina.home = /home/q/tomcat user.name = tomcat java.class.path = /home/q/tomcat/bin/bootstrap.jar:/home/q/tomcat/bin/tomcat-juli.jar java.naming.factory.initial = org.apache.naming.java.javaURLContextFactory package.definition = sun.,java.,org.apache.catalina.,org.apache.coyote.,org.apache.tomcat.,org.apache.jasper. java.vm.specification.version = 1.7 sun.arch.data.model = 64 sun.java.command = org.apache.catalina.startup.Bootstrap start java.home = /home/q/java/jdk1.7.0_45/jre user.language = en java.specification.vendor = Oracle Corporation awt.toolkit = sun.awt.X11.XToolkit java.vm.info = mixed mode java.version = 1.7.0_45 java.ext.dirs = /home/q/java/jdk1.7.0_45/jre/lib/ext:/usr/java/packages/lib/ext sun.boot.class.path = /home/q/java/jdk1.7.0_45/jre/lib/resources.jar:/home/q/java/jdk1.7.0_45/jre/lib/rt.jar:/home/q/java/jdk1.7.0_45/jre/lib/sunrsasign.jar:/home/q/java/jdk1.7.0_45/jre/lib/jsse.jar:/home/q/java/jdk1.7.0_45/jre/lib/jce.jar:/home/q/java/jdk1.7.0_45/jre/lib/charsets.jar:/home/q/java/jdk1.7.0_45/jre/lib/jfr.jar:/home/q/java/jdk1.7.0_45/jre/classes server.loader = java.vendor = Oracle Corporation catalina.base = /home/q/www/projectA file.separator = / java.vendor.url.bug = http://bugreport.sun.com/bugreport/ common.loader = ${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar sun.io.unicode.encoding = UnicodeLittle sun.cpu.endian = little package.access = sun.,org.apache.catalina.,org.apache.coyote.,org.apache.tomcat.,org.apache.jasper.,sun.beans. sun.cpu.isalist = VM Flags: -Djava.util.logging.config.file=/home/q/www/projectA/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Xms7168m -Xmx7168m -Xmn2048m -XX:SurvivorRatio=6 -XX:-OmitStackTraceInFastThrow -XX:+DisableExplicitGC -XX:MaxPermSize=400m -verbose:gc -XX:+PrintGCDateStamps -XX:+PrintGCDetails -Xloggc:/home/q/www/projectA/logs/gc.log -Djava.endorsed.dirs=/home/q/tomcat/endorsed -Dcatalina.base=/home/q/www/projectA -Dcatalina.home=/home/q/tomcat -Djava.io.tmpdir=/home/q/www/projectA/temp
查看参数:
sudo jinfo -flag MaxPermSize 48892
输出:
-XX:MaxPermSize=85983232
修改参数:
C:\Users\xinchun.wang> jinfo -flag PrintGCDetails 48892 -XX:-PrintGCDetails C:\Users\xinchun.wang> jinfo -flag +PrintGCDetails 48892 #无输出 C:\Users\xinchun.wang> jinfo -flag PrintGCDetails 48892 -XX:+PrintGCDetails
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