[rules-users] Drools memory usage issue

[Pavel Tavoda]

At first start with tuning JVM. Xms, Xmx parameters. How much physical
memory you have? If above 3.xx GB you need 64 bit JVM. If this is not
enough just kick Profiler.

Pavel

2010/3/2 Shah, Malay <Malay.Shah at morganstanley.com>:
> Hi,
>
> We have an drools 5.0.1 application that uses StatelessSession and high
> volume of objects (facts) that we need to apply static rules on, and having
> out of memory issues doing so. We added the following three properties as
> given in the drools documentation for decreasing the memory usage:
>
> drools.shadowproxy=false
> drools.maintainTms=false
> drools.sequential=true
>
> As per the following blog, there is an algorithm to minimize the engine
> work, and memory usage.
> http://blog.athico.com/2007/07/sequential-rete.html
> Are the properties above sufficient to trigger this algorithm, or do we need
> to do write extra code for this?
>
> Also, does the "drools.sequential" property make sure that rules are applied
> sequentially on facts? If so, is there a hook into the drools engine to
> figure out which particular rule is consuming more memory or having more
> execution time?
>
> Thanks in advance.
>
> Malay Shah
>
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