Amit Mhatre wrote:
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 sounds like a bug. Stateless session should definitely not get
repeatedly slower - as it's really just conenience wrapper around a
stateful session.
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.
Maybe someone can review the stateless session code and try and find
where the memory leak is coming from?
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
<[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>> 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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