[rules-users] Drools compiler memory & stateless sessions?

[Kris Nuttycombe]

Hi, all,

I'm encountering significant problems with running out of memory when
executing a small ruleset (only 16 rules, < 100 facts). I've run jmap on the
process (which has previously spawned multiple stateless sessions in
parallel) and it looks like Drools, and specifically the Eclipse jdt
compiler, is seriously eating up memory. The code calling the is fairly
simple; one of the initial facts is an accumulator that I refer to later:

        StatelessSession session = ruleBase.newStatelessSession();
        session.execute(initialFact, accumulator);

        accumulator.doSomething();

where ruleBase is a shared instance, and initialFact is a base fact that is
expanded during rules processing. Is there something I should be doing to
dispose the session after use to release the objects created by the drools
compiler after use? I'm using a shared RuleBase, and I'm wondering whether
it is somehow keeping references around. Are these sorts of object counts to
be expected?

Thanks,

Kris
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