On 07/01/2016 02:08 PM, Jeffrey Wong wrote:
Hey there!
I'm running a pretty vanilla CAS system as a login system for a few
internal applications at my company at a pretty low traffic rate. My
CAS deployment fell off this morning (running 4.2.2) due to Permgen
out of memory issues. I've got a few questions as to how best to
mitigate CAS' downtime.
Suggestions seem to say that CMSClassUnloadingEnabled should be
ticked. Does this help to alleviate issues? (Flag is for cleaning up
unused classes out of memory. Does CAS dynamically allocate many
classes at runtime that I should be worried about, or am I
misconfiguring something?)
I don't know about CAS specifically, but I doubt this will help much. If
the classes were loaded, they're probably needed. While it might clean
things up in the short term, they will most likely just get loaded again
at some point in the future.
I also control the environment and wondering if java 8's memory
management and GC implementation would help to mitigate this kind of
stuff. Is 4.2.2 supported in java 8 or do I have to wait for the v5 to
drop? Does java8 help with memory management?
With Java 8 you'll never have another permgen issue. That memory pool
has been removed. Documentation states Java 1.7+, so I would expect 8 to
work.
In the short term, just throw more memory at permgen. It's one of the
command line flags for when your container starts up. I think by default
it is pretty low. Be sure to set -XX:PermSize and -XX:MaxPermSize to the
same value. If you're running default, it's probably under 100m, I would
go to 512m, unless that's what you already have.
It is possible that if it is doing a lot of application redeploys in the
same container that there is a leaking class loader that will cause it
to eventually fill it up.
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