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

[murphy]

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
 
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