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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
如果是雲主機，配置 java.rmi.server.hostname=192.168.0.1 為內網IP地址，這樣只能從內網監控 JVM。如果僅僅是開發調試可以不用設置 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
啟動 jconsole
jconsole localhost:911
觀察運行中的java程序的運行環境參數：參數包括Java System屬性，各種.properties檔案配置參數和JVM命令行參數
# 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
實例二
# 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，還可以加上 -h3 每三行顯示一下標題。
# jstat -printcompilation -h3 15888 Compiled Size Type Method 2987 91 1 org/apache/catalina/connector/Request isAlpha