Re: [rules-users] Memory issues

Yes. The 18 KnowledgeAgents produce 18 StatefulKnowledgeSessions when they are needed. The session has dispose() called on it when it is not needed any longer.**** ** ** The Map<X,Y> maps the following:**** ** ** X = product name**** Y = the Knowledge Agent associated to a product.**** ** ** Code does the following when rules need to be run against a product.**** ** ** **1) **Get KnowledgeAgent out of Map based on product name**** **2) **Create a StatefulKnowledgeSession**** **3) **Insert the facts about the product**** **4) **Fire all rules**** **5) **Dispose of StatefulKnowledgeSession**** ** ** We have no problems with the 5 steps that are followed. The rules are configuration and pricing rules for each product. The facts are the options specified for a particular product. The rules compute the price of the product as specified by the desired options and any incompatible options selected [very similar to what you would see on car manufacturers website for pricing a particular car] If there is a better way to do this, I would be interested in knowing.**** ** ** Jeff**** ** ** ** ** *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Wolfgang Laun *Sent:* Wednesday, July 13, 2011 1:27 PM *To:* Rules Users List *Subject:* Re: [rules-users] Memory issues**** ** ** This is strange - do you mean that those 18 KnowledgeAgents stored in that Map produce 18 different StatefulKnowledgeSessions? What does the Map<X,Y> map? X? Y? -W**** 2011/7/13 Jeffrey Schneller <jeffrey.schneller(a)envisa.com&gt;**** I am currently running version 5.1.0M2. I have 18 different binary rulesets [packages] that are stored on the local filesystem. The rulesets range in size from 4K to 131Mb. **** **** When my application starts I load each ruleset into a knowledgeAgent and store the knowledgeAgent into a hashmap which is stored in memory. They are loaded using the following xml:**** **** <?xml version=\"1.0\" encoding=\"UTF-8\"?>**** <change-set xmlns='http://drools.org/drools-5.0/change-set' xmlns:xs=' http://www.w3.org/2001/XMLSchema-instance' xs:schemaLocation=' http://drools.org/drools-5.0/change-set.xsd'>**** <add>**** <resource source='file://PATH_TO_BINARY' type='PKG' />**** </add>**** </change-set>**** **** The knowledgeAgentConfiguration is setup as:**** drools.agent.scanDirectories = false**** drools.agent.newInstance = false**** drools.agent.scanResources = false**** drools.agent.monitorChangeEvents = false**** **** After the all the agents are loaded and stored in the hashmap the total memory used in the app is 6.2GB. **** **** Once the application is running, if a business user needs to update a set of rules there is a process in place to refresh all the knowledgeAgents with new rulesets. In a new thread. the code clears the hashmap, sets the hashmap to null, calls for garbage collection to occur, and it then constructs a new hashmap and loads all the rules as it does at application startup. **** **** The knowledge agent is logging the following when the ruleset is loaded:** ** KnowledgeAgent applying ChangeSet**** KnowledgeAgent performing an incremental build of the ChangeSet**** KnowledgeAgent incremental build of KnowledgeBase finished and in use**** **** **** It takes a large amount of time to do this process [double to triple the time of application startup]. After this occurs the memory used by the app increases [to nearly double the original size 12.2GB] and the CPU is maxed out. After some time the CPU usage drops and the app is usable again but the memory never decreases. If a business user refreshes the rules again, the memory increases again and the CPU is maxed out and the app becomes unresponsive because the memory is completely maxed out.**** **** There is obviously a memory leak somewhere and a large one at that. Is this the proper way to be caching KnowledgeAgents into memory so the rulessets don’t need to be re-loaded everytime a knowledgeAgent is run? Is my problem the use of the hashmap? Do I need to remove the original knowledgeAgents that were in the hashmap?**** **** **** Thanks for any help.**** **** _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users**** ** ** _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users