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

Wed Nov 26 12:51:41 EST 2008

hi, I was facing similar issues some time back, though I was using a
ruleflow and had >20000 fact objects evaluated daily. The problem I was
facing was that the running time would get significantly slower day by day.
The solution that fixed it was to use a statefulSession and call dispose()
on the session once it is done. This made a single-run slower than before,
but atleast fixed the problem of exponentially increasing the run-time after
several days.

This might not necessarily be the ideal solution, so before you move to a
StatefulSession and call session.dispose() after processing, you might want
to try to increase the memory for the jvm, if is lower than the size of your
facts, this might fix it.

It'd be useful to know if somebody has a better solution to Kris's problem.

Thanks,
- am

On Wed, Nov 26, 2008 at 9:35 AM, Kris Nuttycombe
<kris.nuttycombe at gmail.com>wrote:

> 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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>
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