3 Replies Latest reply: Jun 21, 2013 8:24 AM by user12019587 RSS

    Up to 50% of JVM Heap size is already used after rebooting the servers

    user12019587

      Hello everyone,

       

       

      We just started to deploy and run our first ADF applications. The
      application is deployed to cluster which consists of two managed servers ADF1 (resides
      on the same machine as Admin server – HOST1) and ADF2 (resides on another host –
      HOST2). We have two medium size ADF applications deployed to cluster.

       

       

      After rebooting the machine I already saw that heap size is about
      of 50% of usage on both managed servers. However there are 0 sessions running
      on both managed servers.

       

       

      After changing default JAVA Memory arguments in setDomainEnv.sh on
      both hosts

       

       

      From:

       

       

      -Xms256m -Xmx512m
      -XX:CompileThreshold=8000 -XX:PermSize=128m
      -XX:MaxPermSize=512m

       

       

      To:

       

       

      MEASUREMENT_ARGS="-verbose:gc
      -XX:+PrintGCDetails -XX:+PrintGCTimeStamps"

       

       

      export
      MEASUREMENT_ARGS

       

       

       

       

       

      USER_MEM_ARGS="${MEASUREMENT_ARGS}
      -Xms1024m -Xmx1024m -XX:PermSize=512m -XX:MaxPermSize=512m"

       

       

      export USER_MEM_ARGS

       

       

      I am still getting up to 33% of Heap already used.

       

       

      So my question is why the heap is already used
      by 33% after rebooting the servers when no sessions are running on the server?

       

       

       

       

       

      System
      parameters:

       

       

      Operating
      system RHEL 6.2 64 bit

       

       

      /u01/app/oracle/product/fmw/jdk1.7.0_17/bin> ./java -version

       

       

      java version "1.7.0_17"

       

       

      Java(TM) SE Runtime Environment (build 1.7.0_17-b02)

       

       

      Java
      HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)

       

       

       

       

       

      Thank you
      in advance

       

       

      Alex