[rules-users] drools expert: memory issues

[Jevon Wright]

Hi Miguel,

I assume that you've used a memory analyzer to find out conclusively that
the memory usage is by Drools, and not a memory leak?

One way to do this is to limit the virtual memory to a small amount, add
-XX:+HeapDumpOnOutOfMemoryError to your environment, and then using Memory
Analyzer to analyse the dump.

Cheers
Jevon

On Wed, Mar 31, 2010 at 2:44 AM, Miguel Machado <mls.machado at gmail.com>wrote:

> hi all,
>
> I'm quite new to the drools rule engine and i've been using it for a
> project where i need to filter events and execute actions accordingly.
>
> I'm currently running a DRL file and creating a stateful session from it,
> and then running 2/3 facts every time. Every X seconds I collect the
> available facts and call fireAllRules() + dispose(), always within the same
> session. The DRL file has circa 2160 rules declared (an external program is
> producing them), and i'm using the "no-loop", "lock-on-active",
> "activation-group" and "agenda-group" options on almost every one.
>
> My main problem is that the software is consuming too much memory when it
> loads the rules to the knowledge base variable, it reaches +300Mb which is
> just not affordable in this project. Is there any way i can work around
> this? I've tried setting some configuration properties but to no avail. What
> techniques may i try in order to reduce memory load on drools startup? What
> would be the best approach for dealing with so many rules?
>
> Anything would help, thanks in advance,
>
> _ miguel
>
>
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