My responses below/inline, On Thu, Jul 28, 2016 at 10:23 AM, Felipe Jaekel <fkjae...@gmail.com> wrote:
> I used to run TomEE 1.7.2 with java 7 and the following config: > -Xms1G > -Xmx3G (server has 4G) > -XX:MaxPermSize=1G > -XX:+UseTLAB > -XX:+UseConcMarkSweepGC > -XX:+CMSIncrementalMode > -XX:+CMSClassUnloadingEnabled > I used the options similar to these above for years. With these settings (and throughout the years), I have seen memory required-and-used between 500M and 4G, depending on certain database queries/operations executed during runtime. > > I upgraded to Java 8 to use TomEE 7.0.x, so I decided to try different > settings: > -Xmx3G (server has 4G) > -XX:+UseG1GC > -XX:+UseStringDeduplication > Recently, I changed to these options above after seeing others speak about this in ActiveMQ (or tomcat) user mail list, and I am impressed with what I see whenever I check memory at runtime via Java Visual VM (via JMX). Now, quite consistently, I see memory required-and-used <= 500M (sometimes 700M, but not really over 700M).
