2 Replies Latest reply: May 5, 2014 6:20 PM by WiWildcat RSS

    Java Heap Size Recommendation Request

    WiWildcat Community Member
    WiWildcat May 5, 2014 11:29 AM

      Looking for suggestions on tuning. Running CF10 update 13 on a 64 bit server with 8 GB RAM, running into memory issues (I suspect). JVM is only set to 256 / 512 right now, so I'm going to increase it. CF and a handful of sites is pretty much all this server does.

      Suggestions on what I should set this to now? We seem to be under 50% memory usage at the present time (right now 3.44GB), and CPU is 0-2%.

        • 1. Re: Java Heap Size Recommendation Request
          carl type3 Community Member
          carl type3 May 5, 2014 3:51 PM (in response to WiWildcat)

          Hi,

           

          Perhaps set JVM minimum and maximum to 2048 / 4096. While your altering JVM apply a minimum setting for Permanent Generation and set maximum for permanent larger EG:
          -XX:PermSize=284m -XX:MaxPermSize=512m

           

          You could do well to perform some CF Java monitoring to know what values suit best and if indeed the garbage collections run by -XX:+UseParallelGC are working optimally. Java logging can be run by doing some traditional Java logging to a file then read file or pass file thru a tool. You can also use Jconsole, Jvisualvm or even the new Mission Control (in 1.7.0_40 release onwards) graphical tools.

           

          HTH, Carl.

          • 2. Re: Java Heap Size Recommendation Request
            WiWildcat Community Member
            WiWildcat May 5, 2014 6:20 PM (in response to carl type3)

            Carl,

             

            Thank you! I appreciate your answer very much, with reasoning and a holistic view.

             

            I will look into Java monitoring. Have not done that yet, but always looking to upgrade my skills.

             

            I can set JVM in CF Admin and have done so. I know there are some things you can do to activate the jvm config file but I haven't had the need to mess with that yet. Thought I changed it once, but it was reset when I restarted CF so swing and a miss.

             

            Systems running better already though with that huge headroom in memory.

             

            Thanks again!

            RLS