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<div class="section" id="jvm">
<span id="jvm"></span><h1>jvm<a class="headerlink" href="#jvm" title="永久链接至标题"></a></h1>
<blockquote>
<div>查看当前JVM信息</div></blockquote>
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<span id="id1"></span><h2>使用参考<a class="headerlink" href="#" title="永久链接至标题"></a></h2>
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<div class="highlight-default notranslate"><pre class="literal-block">$ jvm
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CATEGORY INFO
------------------------------------------------------------------------------------------------------------------------------------
RUNTIME MACHINE-NAME hellodeMacBook-Air.local
JVM-START-TIME 2015-12-23 10:54:18
MANAGEMENT-SPEC-VERSION 1.2
SPEC-NAME Java Virtual Machine Specification
SPEC-VENDOR Oracle Corporation
SPEC-VERSION 1.8
VM-NAME Java HotSpot(TM) 64-Bit Server VM
VM-VENDOR Oracle Corporation
VM-VERSION 25.60-b23
INPUT-ARGUMENTS -Xbootclasspath/a:/Users/hello/.jenv/versions/1.8/lib/tools.jar
-Djava.util.logging.config.file=/Users/hello/code/java/crash/packaging/target/
conf/logging.properties
CLASS-PATH /Users/hello/.jenv/versions/1.8/lib/tools.jar:/Users/hello/code/java/cras
h/packaging/target/bin/crash.cli-1.3.2-SNAPSHOT.jar::/Users/hello/code/java/cr
ash/packaging/target/lib/bcpkix-jdk15on-1.51.jar:/Users/hello/code/java/crash/
packaging/target/lib/bcprov-jdk15on-1.51.jar:/Users/hello/code/java/crash/pack
aging/target/lib/crash.connectors.ssh-1.3.2-SNAPSHOT-standalone.jar:/Users/hengyuna
bc/code/java/crash/packaging/target/lib/crash.connectors.telnet-1.3.2-SNAPSHOT-stan
dalone.jar:/Users/hello/code/java/crash/packaging/target/lib/crash.shell-1.3.2
-SNAPSHOT.jar:/Users/hello/code/java/crash/packaging/target/lib/groovy-all-1.8
.9.jar:/Users/hello/code/java/crash/packaging/target/lib/ivy-2.2.0.jar
BOOT-CLASS-PATH /Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/resources.j
ar:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/rt.jar:/
Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/sunrsasign.j
ar:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jsse.jar
:/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jce.jar:/L
ibrary/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/charsets.jar:
/Library/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/lib/jfr.jar:/Li
brary/Java/JavaVirtualMachines/jdk1.8.0_60.jdk/Contents/Home/jre/classes:/Users/hen
gyunabc/.jenv/versions/1.8/lib/tools.jar
LIBRARY-PATH /Users/hello/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library
/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
CLASS-LOADING LOADED-CLASS-COUNT 4264
TOTAL-LOADED-CLASS-COUNT 4264
UNLOADED-CLASS-COUNT 0
IS-VERBOSE false
COMPILATION NAME HotSpot 64-Bit Tiered Compilers
TOTAL-COMPILE-TIME 5145(ms)
GARBAGE-COLLECTORS PS Scavenge 6/74(ms)
[count/time]
PS MarkSweep 1/64(ms)
[count/time]
MEMORY-MANAGERS CodeCacheManager Code Cache
Metaspace Manager Metaspace
Compressed Class Space
PS Scavenge PS Eden Space
PS Survivor Space
PS MarkSweep PS Eden Space
PS Survivor Space
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]
PENDING-FINALIZE-COUNT 0
OPERATING-SYSTEM OS Mac OS X
ARCH x86_64
PROCESSORS-COUNT 4
LOAD-AVERAGE 2.328125
VERSION 10.10.5
THREAD COUNT 16
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
MAX-FILE-DESCRIPTOR-COUNT 10240
OPEN-FILE-DESCRIPTOR-COUNT 648
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Affect cost in 2 ms.</pre>
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</div>
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<span id="thread"></span><h2>THREAD相关<a class="headerlink" href="#thread" title="永久链接至标题"></a></h2>
<ul class="simple">
<li>COUNT: JVM当前活跃的线程数</li>
<li>DAEMON-COUNT: JVM当前活跃的守护线程数</li>
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<li>PEAK-COUNT: 从JVM启动开始曾经活着的最大线程数</li>
<li>STARTED-COUNT: 从JVM启动开始总共启动过的线程次数</li>
<li>DEADLOCK-COUNT: JVM当前死锁的线程数</li>
</ul>
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<span id="id2"></span><h2>文件描述符相关<a class="headerlink" href="#" title="永久链接至标题"></a></h2>
<ul class="simple">
<li>MAX-FILE-DESCRIPTOR-COUNTJVM进程最大可以打开的文件描述符数</li>
<li>OPEN-FILE-DESCRIPTOR-COUNTJVM当前打开的文件描述符数</li>
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