On 24/03/2015 15:04, Johan Compagner wrote: >> >> >> I understand all that. But the basic view, from a sysadmin's point of >> view is this : >> >> Tomcat 6(6.0.28) >> Virtual Memory: 6772 MB >> Resident Memory: 81 MB >> >> Tomcat 7(7.0.54) >> Virtual Memory: 6778 MB >> Resident Memory: 148 MB >> >> > what does that Resident exactly mean here? > i guess the total heap the java vm has taken after startup? > > Because that could be quite logical, maybe tomcat 7 needs a lot more data > because of that annotation scanning > Doesn't it load in way more classes?
No. It uses byte code scanning to analyse all the classes and then only loads the few that it needs to. This will , as Chris pointed out, generate a huge amount of garbage. > All that processing and then also maybe loading in up front way more > classes then before will mean that the heap (and none heap in this > scenario) is already way more loaded. I would expect Tomcat 7 to load more classes since it has more features (annotation scanning, 2 WebSocket implementations etc.) Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
