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jvm
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===
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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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CATEGORY INFO
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------------------------------------------------------------------------------------------------------------------------------------
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RUNTIME MACHINE-NAME hellodeMacBook-Air.local
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JVM-START-TIME 2015-12-23 10:54:18
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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 25.60-b23
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INPUT-ARGUMENTS -Xbootclasspath/a:/Users/hello/.jenv/versions/1.8/lib/tools.jar
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-Djava.util.logging.config.file=/Users/hello/code/java/crash/packaging/target/
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conf/logging.properties
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CLASS-PATH /Users/hello/.jenv/versions/1.8/lib/tools.jar:/Users/hello/code/java/cras
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h/packaging/target/bin/crash.cli-1.3.2-SNAPSHOT.jar::/Users/hello/code/java/cr
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ash/packaging/target/lib/bcpkix-jdk15on-1.51.jar:/Users/hello/code/java/crash/
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packaging/target/lib/bcprov-jdk15on-1.51.jar:/Users/hello/code/java/crash/pack
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aging/target/lib/crash.connectors.ssh-1.3.2-SNAPSHOT-standalone.jar:/Users/hengyuna
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bc/code/java/crash/packaging/target/lib/crash.connectors.telnet-1.3.2-SNAPSHOT-stan
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dalone.jar:/Users/hello/code/java/crash/packaging/target/lib/crash.shell-1.3.2
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-SNAPSHOT.jar:/Users/hello/code/java/crash/packaging/target/lib/groovy-all-1.8
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.9.jar:/Users/hello/code/java/crash/packaging/target/lib/ivy-2.2.0.jar
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BOOT-CLASS-PATH /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/resources.j
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ar:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/rt.jar:/
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Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/sunrsasign.j
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ar:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jsse.jar
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:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jce.jar:/L
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ibrary/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/charsets.jar:
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/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jfr.jar:/Li
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brary/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/classes:/Users/hen
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gyunabc/.jenv/versions/1.8/lib/tools.jar
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LIBRARY-PATH /Users/hello/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library
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/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
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CLASS-LOADING LOADED-CLASS-COUNT 4264
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TOTAL-LOADED-CLASS-COUNT 4264
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UNLOADED-CLASS-COUNT 0
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IS-VERBOSE false
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COMPILATION NAME HotSpot 64-Bit Tiered Compilers
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TOTAL-COMPILE-TIME 5145(ms)
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GARBAGE-COLLECTORS PS Scavenge 6/74(ms)
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[count/time]
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PS MarkSweep 1/64(ms)
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[count/time]
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MEMORY-MANAGERS CodeCacheManager Code Cache
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Metaspace Manager Metaspace
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Compressed Class Space
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PS Scavenge PS Eden Space
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PS Survivor Space
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PS MarkSweep PS Eden Space
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PS Survivor Space
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PS Old Gen
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MEMORY HEAP-MEMORY-USAGE 1073741824(1.00 GiB)/1073741824(1.00 GiB)/5242880000(4.88 GiB)/278637584(265.73 MiB)
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[committed/init/max/used]
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NO-HEAP-MEMORY-USAGE 172597248(164.60 MiB)/2555904(2.44 MiB)/1862270976(1.73 GiB)/166521144(158.81 MiB)
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[committed/init/max/used]
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PENDING-FINALIZE-COUNT 0
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OPERATING-SYSTEM OS Mac OS X
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ARCH x86_64
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PROCESSORS-COUNT 4
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LOAD-AVERAGE 2.328125
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VERSION 10.10.5
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THREAD COUNT 16
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DAEMON-COUNT 10
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PEAK-COUNT 18
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STARTED-COUNT 19
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DEADLOCK-COUNT 0
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FILE-DESCRIPTOR
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MAX-FILE-DESCRIPTOR-COUNT 10240
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OPEN-FILE-DESCRIPTOR-COUNT 648
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Affect cost in 2 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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