[rules-users] high memory usage for rules with more than 6 facts as condition

[Wolfgang Laun]

Do you constrain the number of possible matches of 10 elements, which,
without constraints, is quite a number (10! = 3628800)?

Tests that produce a highly unlikely scenario aren't particularly useful.

-W

On Wed, Apr 14, 2010 at 11:40 AM, murphy <christian.niehues at its-telco.de> wrote:
>
> Hello,
>
> I did some tests to get an opinion about the performance of drools (5.0.1).
>
> At one test I have a rule with 10 objects (same object-type) declared as
> condition and got an OutOfMemoryException. I noticed that the memory usage
> increases when I insert the last facts into my
> StatefulKnowledgeSession. On fact 7 it increases with 10MB, on fact 8 with
> 46MB and on fact 9 with 170MB.
>
> I debuged a little bit in the drools-source and noticed that the
> LeftTupleMemory increased exponential with the number of facts I inserted.
>
> My question about this behaviour:
> Is a condition limited to a handful of facts or do I have to change the
> syntax to get it working? I know that I could insert the same object-types
> as a list, but assume that I have 10 facts with different object-types.
>
> Thanks in reply,
> Christian
>
> --
> View this message in context: http://n3.nabble.com/high-memory-usage-for-rules-with-more-than-6-facts-as-condition-tp718114p718114.html
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