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POWhy is JVM continously doing full gc while the Old Generation is only half full?
 

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  1. POWhy is JVM continously doing full gc while the Old Generation is only half full?
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    <p>I am using jdk 1.7.0_09 on a CentOS 64-bit linux machine. </p> <p>The gc related vm args is </p> <blockquote> <p>-Xmx4g -Xmn2g -XX:SurvivorRatio=4 -XX:PermSize=128m -XX:MaxPermSize=128m -XX:InitialTenuringThreshold=15 -XX:CMSWaitDuration=50 -XX:MaxTenuringThreshold=15 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:CMSInitiatingOccupancyFraction=80 -XX:+CMSParallelRemarkEnabled -XX:ReservedCodeCacheSize=128m</p> </blockquote> <p>But it's continuously doing full gc </p> <pre><code>jstat -gcutil pid 1000 S0 S1 E O P YGC YGCT FGC FGCT GCT 0.00 0.00 15.62 57.52 19.90 11 2.081 11109 7454.686 7456.767 0.00 0.00 15.81 57.52 19.90 11 2.081 11109 7454.686 7456.767 0.00 0.00 15.81 57.51 19.90 11 2.081 11111 7454.892 7456.973 0.00 0.00 16.06 57.51 19.90 11 2.081 11111 7455.115 7457.196 0.00 0.00 16.06 57.51 19.90 11 2.081 11111 7455.115 7457.196 0.00 0.00 16.27 57.51 19.90 11 2.081 11111 7455.115 7457.196 0.00 0.00 16.27 57.51 19.90 11 2.081 11111 7455.115 7457.196 0.00 0.00 16.29 57.51 19.90 11 2.081 11111 7455.115 7457.196 0.00 0.00 16.29 57.51 19.90 11 2.081 11111 7455.115 7457.196 0.00 0.00 16.29 57.47 19.90 11 2.081 11113 7455.549 7457.629 0.00 0.00 16.29 57.47 19.90 11 2.081 11113 7455.549 7457.629 0.00 0.00 16.34 57.47 19.90 11 2.081 11113 7455.549 7457.629 0.00 0.00 16.34 57.47 19.90 11 2.081 11113 7455.549 7457.629 0.00 0.00 16.34 57.47 19.90 11 2.081 11113 7455.549 7457.629 0.00 0.00 16.42 57.47 19.90 11 2.081 11114 7455.549 7457.629 0.00 0.00 16.42 57.44 19.90 11 2.081 11115 7455.986 7458.067 </code></pre>
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