title: Unrecognized vm option when opening eclipse
body: <p>I customized my <code>eclipse.ini</code> as suggested in the post <a href="https://stackoverflow.com/questions/142357/what-are-the-best-jvm-settings-for-eclipse#144349">What are the best JVM settings for Eclipse?</a> . When I run eclipse with this eclipse.ini. It works well on my machine . I suggested these file to my colleagues . On of them has got this exception . </p>
  
  <pre><code>UnRecognized vm option -XX:ConcGCThreads .
  </code></pre>
  
  <p>Exception occured jdk version - 1.6.0_16 .</p>
  
  <p>I am using jdk <code>1.6.0_24</code> . How can i know what are all the jvm options supported from jdk <code>1.6.0_0</code>? . </p>
  
  <p><strong>Eclipse.ini</strong></p>
  
  <pre><code> -showsplash
  -vmargs
  -Xincgc
  -Xss500k
  -Dosgi.requiredJavaVersion=1.6
  -Xms512m
  -Xmx1024m
  -XX:NewSize=8m
  -XX:PermSize=128m
  -XX:MaxPermSize=150m
  -XX:MaxPermHeapExpansion=10m
  -XX:+UseConcMarkSweepGC
  -XX:CMSInitiatingOccupancyFraction=70
  -XX:+UseCMSInitiatingOccupancyOnly
  -XX:+UseParNewGC
  -XX:+CMSConcurrentMTEnabled
  -XX:ConcGCThreads=2
  -XX:ParallelGCThreads=2
  -XX:+CMSIncrementalPacing
  -XX:CMSIncrementalDutyCycleMin=0
  -XX:CMSIncrementalDutyCycle=5
  -XX:GCTimeRatio=49
  -XX:MaxGCPauseMillis=20
  -XX:GCPauseIntervalMillis=1000
  -XX:+UseCMSCompactAtFullCollection
  -XX:+CMSClassUnloadingEnabled
  -XX:+DoEscapeAnalysis
  -XX:+UseCompressedOops
  -XX:+AggressiveOpts
  -XX:+ExplicitGCInvokesConcurrentAndUnloadsClasses
  -Xverify:none
  </code></pre>