[jboss-user] [Performance Tuning] - Re: Not specifying an -Xms value

Peter Johnson [https://community.jboss.org/people/peterj] created the discussion "Re: Not specifying an -Xms value" To view the discussion, visit: https://community.jboss.org/message/743196#743196 -------------------------------------------------------------- So you are running six copies for the app server at the same time? I'm a little rusty on this (its been years since I looked at JVM memory management in detail), but if I recall correctly, when a JVM starts up it asks the OS if it can reserve the amount of memory specified by -Xmx. If if can't it won't run. If it can, it then requests only -Xms memory for the heap. This can lead to a possible OOME later down the line if you don't have sufficient memory (RAM + swap) to hold -Xmx for all 6 app servers. -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/743196#743196] Start a new discussion in Performance Tuning at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]