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

[Geoffrey De Smet]

there's a maven-drools-plugin out there in the wild to precompile your 
rules.

Op 27-04-11 04:27, Edson Tirelli schreef:
>
>    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 at hp.com <mailto:liron.shebs at 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
>
>
>     _______________________________________________
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>
>
>
>
> -- 
>   Edson Tirelli
>   JBoss Drools Core Development
>   JBoss by Red Hat @ www.jboss.com <http://www.jboss.com>
>
>
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-- 
With kind regards,
Geoffrey De Smet

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