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2018-10-03-vm-flags-from-running-jvm.html
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2018-10-03-vm-flags-from-running-jvm.html
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<div class="post-date">03 Oct 2018</div><h1 class="post-title"><a href="https://www.birkey.co/2018-10-03-vm-flags-from-running-jvm.html">VM flags from running JVM</a></h1>
<p>
While I was doing some JVM GC analysis recently, I got curious about the vm flags that `java` command uses by default if you do not specify it when starting your JVM.
Reading up JDK docs, I found <b>jcmd</b> is exactly what you need:
</p>
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<pre class="src src-shell">jcmd
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<p>
That will list all jvm instances running on your system beginning with
its pids, which you can pass into <b>jcmd</b> with options to print VM flags like this:
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<pre class="src src-shell">jcmd <pid> VM.flags
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<p>
There are many options you can use other than `VM.flags`, which you can get a full list by:
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<pre class="src src-shell">jcmd <pid> help
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