title: Show the default value chosen for XX:ParallelGCThreads
body: <p>I'm tuning the JVM of Java 8 and I'm trying to know what value was defined for the parameter <code>-XX:ParallelGCThreads</code>. The <a href="https://docs.oracle.com/cd/E40972_01/doc.70/e40973/cnf_jvmgc.htm#autoId2" rel="nofollow noreferrer">documentation</a> says:</p>
  
  <blockquote>
    <p><strong>-XX:ParallelGCThreads</strong>: Sets the number of threads used during parallel phases of the garbage collectors. The default value varies with the platform on which the JVM is running.</p>
  </blockquote>
  
  <p>I would like to know what value was defined in my platform and if I need to change that. I don't have in this environment a JDK available, only the JRE.</p>