java heap problem since upgrading to IdP 3.2.1

[Liam Hoekenga]

Since we upgraded to IdP 3.2.1, we find that our heap grows continuously,
requiring that we restart tomcat regularly.

We do consume the InCommon medata aggregate, and our jvm settings we
already large enough to account for that.. but we've upped them again.

We also recently upgraded both tomcat (8.0.35) and oracle java (1.8.0_u92),
but we're still seeing the problem.

Our CATALINA_OPTS look like:

export CATALINA_OPTS="
    -server \
    -Xms256M \
    -Xmx4G \
    -XX:MaxPermSize=128M \
    -XX:+UseParallelOldGC \
    -XX:+DisableExplicitGC \
    -Djava.library.path=/usr/local/lib \
    -Dpython.cachedir=/usr/local/tomcat/temp \
    -Didp.home=$IDP_HOME"

(We're not actually using jython at this point, so we could take out the
python.cachedir option).

These are Redhat 6.7 VMs with 8GB RAM.

We have a fair number of attributes that are populated by ECMAscript
scripts.  Is there garbage collection we need to do there?

Liam
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