Rohit Macherla [http://community.jboss.org/people/rohit.macherla] replied to the discussion "Variation in Max Heap size" To view the discussion, visit: http://community.jboss.org/message/554552#554552 -------------------------------------------------------------- Hi Ruchir, Thanks for the response. Please find my response for the questions : Rohit: We are using HP Unix B11.23_LR Rohit: 4 core CPU, 24GB RAM. Planning to upgrade to 8 core 36GB soon, owing to planned increase in the load. Rohit: Okay. Will test it. Rohit: I am half way through the document. We'll make the changes suggested in  amock environment for testing. However, we are more intent on why the heap size is changing. As a general follow up to the chain, after some hiccups with our support with vendor, we were asked to submit a more recent version of the event and we are in the process of finding a relationship between the max heap variation and CPU utilization. Recently discovered a better way to find the heap statistics using twiddle. I'll keep the results posted after our testing. Hi Peter, As far as I know, having remote objects garbage collected will result in a full GC and if an application does not have much involvement for remote objects, the interval of collection can be set to a higher value. I have no idea how to measure whether the heap I have uses remote objects. Currently, we use webservices and all our apps reside on the same JVM. How the external systems access our webservices, whether it creates remote objects or not is still a black area for me. Since I explicitly do not use RMI, I have enabled a one hour DGC. I will greatly appreciate if you can provide some inputs on the same. Thanks. Rohit M. -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/554552#554552] Start a new discussion in Performance Tuning at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]