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jvm
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===
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[`jvm`在线教程](https://arthas.aliyun.com/doc/arthas-tutorials.html?language=cn&id=command-jvm)
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> 查看当前JVM信息
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### 使用参考
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```
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$ jvm
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RUNTIME
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--------------------------------------------------------------------------------------------------------------
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MACHINE-NAME 37@ff267334bb65
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JVM-START-TIME 2020-07-23 07:50:36
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MANAGEMENT-SPEC-VERSION 1.2
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SPEC-NAME Java Virtual Machine Specification
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SPEC-VENDOR Oracle Corporation
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SPEC-VERSION 1.8
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VM-NAME Java HotSpot(TM) 64-Bit Server VM
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VM-VENDOR Oracle Corporation
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VM-VERSION 25.201-b09
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INPUT-ARGUMENTS []
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CLASS-PATH demo-arthas-spring-boot.jar
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BOOT-CLASS-PATH /usr/lib/jvm/java-8-oracle/jre/lib/resources.jar:/usr/lib/jvm/java-8-oracle/j
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re/lib/rt.jar:/usr/lib/jvm/java-8-oracle/jre/lib/sunrsasign.jar:/usr/lib/jvm/
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java-8-oracle/jre/lib/jsse.jar:/usr/lib/jvm/java-8-oracle/jre/lib/jce.jar:/us
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r/lib/jvm/java-8-oracle/jre/lib/charsets.jar:/usr/lib/jvm/java-8-oracle/jre/l
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ib/jfr.jar:/usr/lib/jvm/java-8-oracle/jre/classes
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LIBRARY-PATH /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
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--------------------------------------------------------------------------------------------------------------
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CLASS-LOADING
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--------------------------------------------------------------------------------------------------------------
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LOADED-CLASS-COUNT 7529
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TOTAL-LOADED-CLASS-COUNT 7529
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UNLOADED-CLASS-COUNT 0
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IS-VERBOSE false
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--------------------------------------------------------------------------------------------------------------
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COMPILATION
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--------------------------------------------------------------------------------------------------------------
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NAME HotSpot 64-Bit Tiered Compilers
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TOTAL-COMPILE-TIME 14921(ms)
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--------------------------------------------------------------------------------------------------------------
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GARBAGE-COLLECTORS
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--------------------------------------------------------------------------------------------------------------
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PS Scavenge name : PS Scavenge
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[count/time (ms)] collectionCount : 7
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collectionTime : 68
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PS MarkSweep name : PS MarkSweep
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[count/time (ms)] collectionCount : 1
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collectionTime : 47
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--------------------------------------------------------------------------------------------------------------
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MEMORY-MANAGERS
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--------------------------------------------------------------------------------------------------------------
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CodeCacheManager Code Cache
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Metaspace Manager Metaspace
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Compressed Class Space
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Copy Eden Space
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Survivor Space
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MarkSweepCompact Eden Space
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Survivor Space
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Tenured Gen
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--------------------------------------------------------------------------------------------------------------
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MEMORY
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--------------------------------------------------------------------------------------------------------------
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HEAP-MEMORY-USAGE init : 268435456(256.0 MiB)
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[memory in bytes] used : 18039504(17.2 MiB)
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committed : 181403648(173.0 MiB)
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max : 3817865216(3.6 GiB)
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NO-HEAP-MEMORY-USAGE init : 2555904(2.4 MiB)
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[memory in bytes] used : 33926216(32.4 MiB)
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committed : 35176448(33.5 MiB)
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max : -1(-1 B)
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--------------------------------------------------------------------------------------------------------------
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OPERATING-SYSTEM
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--------------------------------------------------------------------------------------------------------------
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OS Linux
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ARCH amd64
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PROCESSORS-COUNT 3
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LOAD-AVERAGE 29.53
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VERSION 4.15.0-52-generic
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--------------------------------------------------------------------------------------------------------------
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THREAD
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--------------------------------------------------------------------------------------------------------------
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COUNT 30
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DAEMON-COUNT 24
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PEAK-COUNT 31
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STARTED-COUNT 36
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DEADLOCK-COUNT 0
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--------------------------------------------------------------------------------------------------------------
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FILE-DESCRIPTOR
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--------------------------------------------------------------------------------------------------------------
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MAX-FILE-DESCRIPTOR-COUNT 1048576
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OPEN-FILE-DESCRIPTOR-COUNT 100
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Affect(row-cnt:0) cost in 88 ms.
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```
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### THREAD相关
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* COUNT: JVM当前活跃的线程数
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* DAEMON-COUNT: JVM当前活跃的守护线程数
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* PEAK-COUNT: 从JVM启动开始曾经活着的最大线程数
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* STARTED-COUNT: 从JVM启动开始总共启动过的线程次数
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* DEADLOCK-COUNT: JVM当前死锁的线程数
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### 文件描述符相关
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* MAX-FILE-DESCRIPTOR-COUNT：JVM进程最大可以打开的文件描述符数
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* OPEN-FILE-DESCRIPTOR-COUNT：JVM当前打开的文件描述符数
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