jvm

查看当前JVM信息

使用参考

  1. $ jvm
  2.  CATEGORY            INFO
  3. ------------------------------------------------------------------------------------------------------------------------------------
  4.  
  5.  RUNTIME              MACHINE-NAME             hellodeMacBook-Air.local
  6.                       JVM-START-TIME           2015-12-23 10:54:18
  7.                       MANAGEMENT-SPEC-VERSION  1.2
  8.                       SPEC-NAME                Java Virtual Machine Specification
  9.                       SPEC-VENDOR              Oracle Corporation
  10.                       SPEC-VERSION             1.8
  11.                       VM-NAME                  Java HotSpot(TM) 64-Bit Server VM
  12.                       VM-VENDOR                Oracle Corporation
  13.                       VM-VERSION               25.60-b23
  14.                       INPUT-ARGUMENTS          -Xbootclasspath/a:/Users/hello/.jenv/versions/1.8/lib/tools.jar
  15.                                                -Djava.util.logging.config.file=/Users/hello/code/java/crash/packaging/target/
  16.                                                conf/logging.properties
  17.  
  18.                       CLASS-PATH               /Users/hello/.jenv/versions/1.8/lib/tools.jar:/Users/hello/code/java/cras
  19.                                                h/packaging/target/bin/crash.cli-1.3.2-SNAPSHOT.jar::/Users/hello/code/java/cr
  20.                                                ash/packaging/target/lib/bcpkix-jdk15on-1.51.jar:/Users/hello/code/java/crash/
  21.                                                packaging/target/lib/bcprov-jdk15on-1.51.jar:/Users/hello/code/java/crash/pack
  22.                                                aging/target/lib/crash.connectors.ssh-1.3.2-SNAPSHOT-standalone.jar:/Users/hengyuna
  23.                                                bc/code/java/crash/packaging/target/lib/crash.connectors.telnet-1.3.2-SNAPSHOT-stan
  24.                                                dalone.jar:/Users/hello/code/java/crash/packaging/target/lib/crash.shell-1.3.2
  25.                                                -SNAPSHOT.jar:/Users/hello/code/java/crash/packaging/target/lib/groovy-all-1.8
  26.                                                .9.jar:/Users/hello/code/java/crash/packaging/target/lib/ivy-2.2.0.jar
  27.                       BOOT-CLASS-PATH          /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/resources.j
  28.                                                ar:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/rt.jar:/
  29.                                                Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/sunrsasign.j
  30.                                                ar:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jsse.jar
  31.                                                :/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jce.jar:/L
  32.                                                ibrary/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/charsets.jar:
  33.                                                /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jfr.jar:/Li
  34.                                                brary/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/classes:/Users/hen
  35.                                                gyunabc/.jenv/versions/1.8/lib/tools.jar
  36.                       LIBRARY-PATH             /Users/hello/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library
  37.                                                /Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
  38.  
  39.  CLASS-LOADING        LOADED-CLASS-COUNT        4264
  40.                       TOTAL-LOADED-CLASS-COUNT  4264
  41.                       UNLOADED-CLASS-COUNT      0
  42.                       IS-VERBOSE                false
  43.  
  44.  COMPILATION          NAME                HotSpot 64-Bit Tiered Compilers
  45.                       TOTAL-COMPILE-TIME  5145(ms)
  46.  
  47.  GARBAGE-COLLECTORS   PS Scavenge   6/74(ms)
  48.                       [count/time]
  49.                       PS MarkSweep  1/64(ms)
  50.                       [count/time]
  51.  
  52.  MEMORY-MANAGERS      CodeCacheManager   Code Cache
  53.  
  54.                       Metaspace Manager  Metaspace
  55.                                          Compressed Class Space
  56.  
  57.                       PS Scavenge        PS Eden Space
  58.                                          PS Survivor Space
  59.  
  60.                       PS MarkSweep       PS Eden Space
  61.                                          PS Survivor Space
  62.                                          PS Old Gen
  63.  
  64.  MEMORY               HEAP-MEMORY-USAGE          1073741824(1.00 GiB)/1073741824(1.00 GiB)/5242880000(4.88 GiB)/278637584(265.73 MiB)
  65.                       [committed/init/max/used]
  66.                       NO-HEAP-MEMORY-USAGE       172597248(164.60 MiB)/2555904(2.44 MiB)/1862270976(1.73 GiB)/166521144(158.81 MiB)
  67.                       [committed/init/max/used]
  68.                       PENDING-FINALIZE-COUNT     0
  69.  
  70.  OPERATING-SYSTEM     OS                Mac OS X
  71.                       ARCH              x86_64
  72.                       PROCESSORS-COUNT  4
  73.                       LOAD-AVERAGE      2.328125
  74.                       VERSION           10.10.5
  75.  
  76.  THREAD               COUNT          16
  77.                       DAEMON-COUNT   10
  78.                       PEAK-COUNT     18
  79.                       STARTED-COUNT  19
  80.                       DEADLOCK-COUNT  0
  81.  
  82.  FILE-DESCRIPTOR
  83.  
  84.                       MAX-FILE-DESCRIPTOR-COUNT  10240
  85.                       OPEN-FILE-DESCRIPTOR-COUNT 648
  86.  
  87. Affect cost in 2 ms.

THREAD相关

  • COUNT: JVM当前活跃的线程数
  • DAEMON-COUNT: JVM当前活跃的守护线程数
  • PEAK-COUNT: 从JVM启动开始曾经活着的最大线程数
  • STARTED-COUNT: 从JVM启动开始总共启动过的线程次数
  • DEADLOCK-COUNT: JVM当前死锁的线程数

文件描述符相关

  • MAX-FILE-DESCRIPTOR-COUNT：JVM进程最大可以打开的文件描述符数
  • OPEN-FILE-DESCRIPTOR-COUNT：JVM当前打开的文件描述符数

原文: https://alibaba.github.io/arthas/jvm.html