知乎专栏 | 多维度架构 | 微信号 netkiller-ebook | QQ群:128659835 请注明“读者” |
jps: http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jps.html jstat: http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jstat.html jmap: http://java.sun.com/j2se/1.5.0/docs/tooldocs/share/jmap.html
jconsole: http://java.sun.com/j2se/1.5.0/docs/guide/management/jconsole.html
java -jar -Djava.rmi.server.hostname=192.168.0.1 -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=911 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false netkiller-1.0-SNAPSHOT.jar
如果是云主机,配置 java.rmi.server.hostname=192.168.0.1 为内网IP地址,这样只能从内网监控 JVM。如果仅仅是开发调试可以不用设置 java.rmi.server.hostname
java -jar -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=911 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false netkiller-1.0-SNAPSHOT.jar
启动 jconsole
jconsole localhost:911
观察运行中的java程序的运行环境参数:参数包括Java System属性,各种.properties文件配置参数和JVM命令行参数
# jinfo $(pgrep java) Attaching to process ID 15888, please wait... Debugger attached successfully. Server compiler detected. JVM version is 24.72-b04 Java System Properties: java.vendor = Oracle Corporation sun.java.launcher = SUN_STANDARD catalina.base = /srv/apache-tomcat sun.management.compiler = HotSpot 64-Bit Tiered Compilers catalina.useNaming = true captcha.times = 5 os.name = Linux ... ... java.vm.name = Java HotSpot(TM) 64-Bit Server VM cpool.maxIdleTime = 7200 file.encoding = UTF-8 java.specification.version = 1.7 VM Flags: -Djava.util.logging.config.file=/srv/apache-tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Xms512m -Xmx8192m -XX:PermSize=64M -XX:MaxPermSize=512m -Djava.endorsed.dirs=/srv/apache-tomcat/endorsed -Dcatalina.base=/srv/apache-tomcat -Dcatalina.home=/srv/apache-tomcat -Djava.io.tmpdir=/srv/apache-tomcat/temp
实例二
# jinfo $(jps | grep Bootstrap | cut -d " " -f1) Attaching to process ID 15888, please wait... Debugger attached successfully. Server compiler detected. JVM version is 24.72-b04 Java System Properties: java.vendor = Oracle Corporation sun.java.launcher = SUN_STANDARD catalina.base = /srv/apache-tomcat sun.management.compiler = HotSpot 64-Bit Tiered Compilers catalina.useNaming = true captcha.times = 5 os.name = Linux
# jstat -class 15888 1000 10 Loaded Bytes Unloaded Bytes Time 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21
# jstat -gc 15888 1000 10 S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT 13824.0 13824.0 1204.1 0.0 2766848.0 2327059.3 349696.0 318073.6 229888.0 101912.6 288 4.895 2 1.055 5.949 13824.0 13824.0 1204.1 0.0 2766848.0 2327059.3 349696.0 318073.6 229888.0 101912.6 288 4.895 2 1.055 5.949 13824.0 13824.0 1204.1 0.0 2766848.0 2327059.3 349696.0 318073.6 229888.0 101912.6 288 4.895 2 1.055 5.949 13824.0 13824.0 1204.1 0.0 2766848.0 2327059.3 349696.0 318073.6 229888.0 101912.6 288 4.895 2 1.055 5.949
# jstat -gcutil 15888 S0 S1 E O P YGC YGCT FGC FGCT GCT 8.71 0.00 84.12 90.96 44.33 288 4.895 2 1.055 5.949
# jstat -compiler 15888 Compiled Failed Invalid Time FailedType FailedMethod 2987 0 0 59.55 0
# jstat -gccapacity 15888 NGCMN NGCMX NGC S0C S1C EC OGCMN OGCMX OGC OC PGCMN PGCMX PGC PC YGC FGC 175104.0 2796544.0 2794496.0 13824.0 13824.0 2766848.0 349696.0 5592064.0 349696.0 349696.0 65536.0 524288.0 229888.0 229888.0 288 2
# jstat -gcnew 15888 S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT 13824.0 13824.0 1204.1 0.0 1 15 13824.0 2766848.0 2327429.8 288 4.895
# jstat -gcnewcapacity 15888 NGCMN NGCMX NGC S0CMX S0C S1CMX S1C ECMX EC YGC FGC 175104.0 2796544.0 2794496.0 931840.0 13824.0 931840.0 13824.0 2795520.0 2766848.0 288 2
# jstat -gcold 15888 PC PU OC OU YGC FGC FGCT GCT 229888.0 101912.6 349696.0 318073.6 288 2 1.055 5.949
# jstat -gcoldcapacity 15888 OGCMN OGCMX OGC OC YGC FGC FGCT GCT 349696.0 5592064.0 349696.0 349696.0 288 2 1.055 5.949
每 1000 毫秒打印一次,一共打印 5 次,还可以加上 -h3 每三行显示一下标题。
# jstat -printcompilation -h3 15888 Compiled Size Type Method 2987 91 1 org/apache/catalina/connector/Request isAlpha