介绍

jps是jdk提供的一个查看当前java进程的小工具， 可以看做是JavaVirtual Machine Process Status Tool的缩写。用法简单，非常实用。

命令格式

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jps [options] [hostid]

解读

  • [options]选项
    -q：仅输出VM标识符，不包括classname, jar name, arguments in main method
    -m：输出main method的参数
    -l：输出完全的包名，应用主类名，jar的完全路径名
    -v：输出JVM参数
    -V：输出通过flag文件传递到JVM中的参数(.hotspotrc文件或-XX:Flags=所指定的文件
    -Joption: 传递参数到vm, 例如: -J-Xms512m
  • [hostid]选项 
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    [protocol:][[//]hostname][:port][/servername]
    命令的输出格式 ：
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    lvmid [ [ classname| JARfilename | "Unknown"] [ arg* ] [ jvmarg* ] ]

示例

jps

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[xixincandeMacBook-Pro$~]jps
29091 Jps
68677 NamesrvStartup
53653 
68679 BrokerStartup
96697 Launcher

jps -l

输出主类或者jar的完全路径名

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[xixincandeMacBook-Pro$~]jps -l
29106 sun.tools.jps.Jps
68677 org.apache.rocketmq.namesrv.NamesrvStartup
53653 
68679 org.apache.rocketmq.broker.BrokerStartup
96697 org.jetbrains.jps.cmdline.Launcher

jps -v

输出JVM参数

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[xixincandeMacBook-Pro$~]jps -v
29122 Jps -Denv.class.path=/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/lib/tools.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/lib/dt.jar -Dapplication.home=/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home -Xms8m
68677 NamesrvStartup -Xms4g -Xmx4g -Xmn2g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8 -XX:-UseParNewGC -verbose:gc -Xloggc:/Volumes/RAMDisk/rmq_srv_gc_%p_%t.log -XX:+PrintGCDetails -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m -XX:-OmitStackTraceInFastThrow -XX:-UseLargePages -Djava.ext.dirs=/Library/Java/JavaVirtualMachines/jdk1.8.0_152.jdk/Contents/Home/jre/lib/ext:/Users/xixincan/RocketMQ-4_7_0/bin/../lib
53653  -Xms128m -Xmx1500m -XX:ReservedCodeCacheSize=240m -XX:+UseCompressedOops -Dfile.encoding=UTF-8 -XX:+UseConcMarkSweepGC -XX:SoftRefLRUPolicyMSPerMB=50 -ea -Dsun.io.useCanonCaches=false -Djava.net.preferIPv4Stack=true -Djdk.http.auth.tunneling.disabledSchemes="" -XX:+HeapDumpOnOutOfMemoryError -XX:-OmitStackTraceInFastThrow -Xverify:none -XX:ErrorFile=/Users/xixincan/java_error_in_idea_%p.log -XX:HeapDumpPath=/Users/xixincan/java_error_in_idea.hprof -javaagent:/Applications/IntelliJ IDEA.app/Contents/bin/JetbrainsCrack.jar -Djb.vmOptionsFile=/Users/xixincan/Library/Preferences/IntelliJIdea2019.1/idea.vmoptions -Didea.home.path=/Applications/IntelliJ IDEA.app/Contents -Didea.executable=idea -Didea.paths.selector=IntelliJIdea2019.1

jps -q

仅仅显示java进程号

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[xixincandeMacBook-Pro$~]jps -q
68677
53653
68679
96697
29128

注意：如果需要查看其他机器上的jvm进程，需要在待查看机器上启动jstatd。