Re: [rules-users] Drools stateless session question
You have misunderstood the documentation. All eight items in the
enumeration you cite from are steps performed internally by the
Drools engine. The only thing you have to do is request sequential mode.
Without an idea about the rule set you are using it's difficult to
advise how to reduce memory consumption.
-W
2010/3/22 Shah, Malay <Malay.Shah(a)morganstanley.com>:
Hi All,
We have an application that uses drools stateless session over a set of
35000 objects (taking about 40 MB heap) of different types. During
profiling, I saw that for rules that perform joins between two huge object
types data sets, lots of org.drools.reteoo.LeftTuple objects causing out of
memory errors. We are using 5G heap, and have set property
drools.sequential=true too. Is there any way we can decrease the memory
usage while applying these rules? Drools documentation
mentions for sequential mode, we should do the following, some of them I am
not sure how to set:
Turn off all node memories, except the right-input Object memory.
Disconnect the LeftInputAdapterNode propagation, and have the Object plus
the Node referenced in a Command object, which is added to a list on the
WorkingMemory for later execution.
Assert all objects, when all assertions are finished and thus right-input
node memories are populated check the Command list and execute each in turn.
http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html_single/index.h...
Do we need to set some properties in RuleBaseConfiguration to make sure node
memories are switched off? It would be great if we can somehow decrease the
memory usage for stateless sessions? Has anybody come across such memory
issues before? Correct me if I am wrong, but I think 35000 objects is not a
lot of data for causing such issues.
Thanks
Malay
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