James,
> -----Original Message----- > From: James H. H. Lampert <jam...@touchtonecorp.com> > Sent: Thursday, October 22, 2020 2:37 PM > To: Tomcat Users List <users@tomcat.apache.org> > Subject: What exactly is "tenured-SOA"? > > In at least two of our Tomcat installations, the Server Status page of Manager > is showing "tenured-SOA" around 3G, while the other pools are showing > much lower. What exactly *is* "tenured-SOA," and should this be cause for > alarm? > > -- > JHHL > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org The IBM J9 garbage collector splits the old (tenured) generation into soa and loa. That's "small object area" and "large object area." Small objects are moved to soa and large objects to loa. In my very limited experience with J9, most of the action is in soa. 3GB alone doesn't mean much of anything. It's not good or bad. What really matters is how fast it grows because full GCs are more expensive than young GCs. In general, the heap regions should be sized to ensure objects "die young," meaning they should die before they get promoted to the old gen.
