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Contents</div><div class="right-menu-content" data-v-64666cd5><!--[--><!--]--></div></div></div><div data-v-fdd717e0><h1 id="jvm" tabindex="-1"><a class="header-anchor" href="#jvm" aria-hidden="true">#</a> jvm</h1><p><a href="https://arthas.aliyun.com/doc/arthas-tutorials.html?language=en&id=command-jvm" target="_blank" rel="noopener noreferrer"><code>jvm</code> online tutorial<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></p><div class="custom-container tip"><p class="custom-container-title">TIP</p><p>Check the current JVM's info</p></div><h2 id="usage" tabindex="-1"><a class="header-anchor" href="#usage" aria-hidden="true">#</a> Usage</h2><div class="language-text ext-text line-numbers-mode"><pre class="language-text"><code>$ jvm
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RUNTIME
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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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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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COMPILATION
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NAME HotSpot 64-Bit Tiered Compilers
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TOTAL-COMPILE-TIME 14921(ms)
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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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</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div 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class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div><div class="line-number"></div></div></div><h2 id="thread-related" tabindex="-1"><a class="header-anchor" href="#thread-related" aria-hidden="true">#</a> Thread related</h2><ul><li>COUNT: the count of active threads</li><li>DAEMON-COUNT: the count of active daemon threads</li><li>PEAK-COUNT: the maximum count of the live threads since JVM starts</li><li>STARTED-COUNT: the total count of the created threads since JVM starts</li><li>DEADLOCK-COUNT: the count of deadlocked threads</li></ul><h2 id="file-descriptor-related" tabindex="-1"><a class="header-anchor" href="#file-descriptor-related" aria-hidden="true">#</a> File descriptor related</h2><ul><li>MAX-FILE-DESCRIPTOR-COUNT：the count of max file descriptor JVM process can open</li><li>OPEN-FILE-DESCRIPTOR-COUNT：the current count of file descriptor JVM process open</li></ul></div><!--[--><!--]--></div><footer 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