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@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