Hi, Edson and all I am making an experiment on Drools Fusion these days. I found it consumes a lot of memory. And the number of rules, the fields of events, the complexity of rules affect the memory usage. The flow of my experiment is as follow: 1. I have two tables, one for Transaction, one for account. The transaction table have a foreign key number which is the primary key of account table. 2. In one thread, I loaded transaction data and account data into a ArrayBlockingQueue, whose size is 100000. 3. In another thread, I inserted the Transaction as events and the related account as facts into the Fusion Engine. 4. I used a java profiler tool to monitor the memory usage of the Fusion engine, and recorded the highest heap memory usage of ecah round of my experiment. Here is the results: Amount of events highest heap memory usage(MB) 5000 268 10000 470 15000 555 20000 645 25000 845 30000 958 35000 1011 40000 1127 45000 1331 Is this the normal memory usage of Drools Fusion? Otherwise, did I make a mistake? See the attachments for the rules and Java Model classes . If you are intrested in this experiment, I can upload all codes. Thank you very much. I will appreciate for your response. http://drools.46999.n3.nabble.com/file/n4018307/Cep1.drl Cep1.drl http://drools.46999.n3.nabble.com/file/n4018307/TransactionEvent.java TransactionEvent.java http://drools.46999.n3.nabble.com/file/n4018307/Account.java Account.java -- View this message in context: http://drools.46999.n3.nabble.com/Does-Drools-Fusion-consume-a-lot-of-mem... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

I divided it into TransactionEvent and Account. So, when an event was inserted, there are two accounts inserted too.

When I ran my test program without any rules in fusion engine , the results are as follow: Amount of events highest heap memory usage(MB) 5000 308 10000 345 15000 366 20000 392 25000 409 30000 401 35000 399 40000 411 45000 401

No

Oops! I did not retract these two accounts after the transaction has been processed. I thought these two accounts may be used later. I attempted to update these two accounts with session.update(facthandle, object) with assertbehaviour setting to equality. However, no rules were fired. -- View this message in context: http://drools.46999.n3.nabble.com/Does-Drools-Fusion-consume-a-lot-of-mem... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users