GCInterval in Java 8

[Rainer Jung]

Am 24.11.2015 um 12:13 schrieb Denny Kettwig:
> Hello,
>
> I have quick question regarding these two parameters:
>
> -Dsun.rmi.dgc.client.gcInterval=3600000
>
> -Dsun.rmi.dgc.server.gcInterval=3600000
>
> We have set these parameters in the past to force a Full GC once every
> hour, however since we switched to Java 8 the parameter no longer has
> any effect. Has something changed in past? I can’t find any source in
> the net mentioning a change in this area.

Originally the params resulted in a distributed GC exactly every 3600 
seconds apart from each other. I vaguely remember that at some point in 
time it changed to running it if no other GC of Tenured had run since at 
least an hour and only then DGC kicked in. So as long as there are other 
reasons for normal GC of Tenured/OldGen at least once an hour you would 
no longer observe a DGC.

Other sources might confirm this claim and know, in which version that 
was introduced. Could it be the reason for your observation, or do you 
have not other GCs of Tenured/OldGen as well?

How do you check for GC events?

Regards,

Rainer