Aren't you're clients polling the server, this may cause the session not to expire even if the user is not using the UI ?
Jeff On Sat, Oct 6, 2012 at 9:42 PM, Mark Thomas <ma...@apache.org> wrote: > > > Kirill Kireyev <kir...@instagrok.com> wrote: > > >Thanks for all your thorough advice Shanti! (and everyone else) > > > >Here are my findings so far: > >0) My servlet sessions store a large number (~10s of M) or data in RAM. > > > >This is by design, to optimize performance. I can also have ~3K active > >sessions at any one time. Hence a large heap size. > >1) When I (1) manually expire inactive sessions through Tomcat web > >interface and (2) manually hit "Perform GC" through jvisualvm console > >attached to the tomcat process, everything works great, and the memory > >is successfully reclaimed, and the used heap size drops back to what > >it > >should be when the application initializes. > >2) However, this doesn't seem to work automatically. More specifically: > > a) Sessions are not expiring without manually doing it (I can see > >the number growing in the Tomcat web interface). Even though my > >conf/web.xml says: > > <session-config> > > <session-timeout>20</session-timeout> > > </session-config> > > b) A full garbage collection is not being performed unless I do it > >manually. I'm attaching the GC records from my logs/catalina.out. > > > >Any insights? > > Session expiration is performed by the background processing thread. What > is that thread doing (a thread dump - well several over time - will tell > you). > > Fix the session expiration issue and the GC issue will be solved. Note the > JVM may well not perform a full GC unless it absolutely has to. In fact, > the JVM may not perform any GC if it doesn't have to. > > Mark > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > > -- Jeff MAURY "Legacy code" often differs from its suggested alternative by actually working and scaling. - Bjarne Stroustrup http://www.jeffmaury.com http://riadiscuss.jeffmaury.com http://www.twitter.com/jeffmaury
