[jboss-user] [Performance Tuning] New message: "Variation in Max Heap size"

User development, A new message was posted in the thread "Variation in Max Heap size": http://community.jboss.org/message/527579#527579 Author : Rohit Macherla Profile : http://community.jboss.org/people/rohit.macherla Message: -------------------------------------------------------------- Hi ,   I am using JBoss 4.2.3.GA server on a HP UX machine. Recently, our organization planned to buy a tool for performance monitoring of the enterprise applications. We have received reports that the maximum value of the heap is varying at times. As a direct result, I can see the CPU utilization (4 core, 3GHz machine) going up to 70% from a 30%. The funny thing is : actual heap utilization is almost constant (at 750MB) I have attached an image of the heap variation. (In the picture, the green line represents the max heap while the red one marks the current utilization. We can notice that about the same time, the CPU utilization also increased.)   In the run.conf file, we have the following JVM parameters : As we can see, the whole point of making the min and max heap values to be same (2GB) was to avoid the dynamic heap memory allocation by the OS. I am unable to understand why the max heap is varying even though the actual utilization remains the same.   Please let me know if I miss something. -------------------------------------------------------------- To reply to this message visit the message page: http://community.jboss.org/message/527579#527579