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

[Wolfgang Laun]

The rule you have shown suggests that many of your rules (if not all)
compare fact fields with literals. If there are groups of rules where just
these literals vary, and the corresponding RHS logic is also uniform (just
varying with the values stored or written or whatever), then you might
consider reducing the number of rules - perhaps even considerably - by
putting those sets of literals into Parameter facts and perform the match
with a considerably smaller set of generic rules, one per such a group.

-W


2011/4/26 Mark Proctor <mproctor at codehaus.org>

>  There is no out of the box way to improve that, beyond just partitioning
> your rulebases yourself.
>
> If you would like to get involved in R&D we can do lazy network building
> and try pushing unused parts of the rule network to disk.
>
> Mark
> On 26/04/2011 12:05, Shebs, Liron wrote:
>
>  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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