Re: [rules-users] Memory issue with drools (using 10000 rules)

Besides all suggestions already made in other e-mails, it is also worth considering if you can pre-compile rules and just load them at runtime instead of compiling them at runtime. I.e, the method: knowledgeBuilder.add(resource, ResourceType.DRL); Will call the JDT compiler to compile your rules and that uses quite a lot of memory that is later disposed. Instead, you could compile the knowledge base at build time and serialize it, and at runtime all you do is deserialize you kbase and use it, saving the memory that was previously used for compilation. Edson 2011/4/26 Shebs, Liron <liron.shebs(a)hp.com <mailto:liron.shebs@hp.com>> Hello All, I’m working at HP Software R&D and we are considering using drools in our product. Benchmarking tests showed that running 10,000 rules consumes 382mb. This is too high for our system requirements, and we would like to know how we can improve it. Technical details: -Drools version: 5.1 with default configuration. -All rules look like this: rule "status-Fixed-Open" when event : FieldChangedEvent(fieldName == "status", oldValue == "Fixed"); entity : Entity(entityType == "mock-entity"); eval(((String) entity.getFieldValue("status")).equals("Open")); then do Something… end -Loading code: KnowledgeBuilder knowledgeBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); for(all resources) { knowledgeBuilder.add(resource, ResourceType.DRL); } knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase(); knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages()); Any insights are most appreciated. Thank You, Liron, HP Software R&D _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org <mailto:rules-users@lists.jboss.org> https://lists.jboss.org/mailman/listinfo/rules-users -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com <http://www.jboss.com> _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users