Hi Liron,
Are you planning on using a stateful or a stateless session afterwards? Do
you have the memory numbers for rules execution? How many facts?
-Leonardo.
2011/4/27 Shebs, Liron <liron.shebs(a)hp.com>
Hi All,
Thank you all for your responses and ideas.
Here are some answers to questions raised by you
· 10,000 rules is what we estimate a real system will contain.
· The rules are similar to each other on the testing environment,
but in the real system we expect more variance, making parameterized rules
difficult to implement.
· Measurements of memory consumption where done after the rules
loading was completed + GC, so I’m sure pre-compiling will help.
· When I say memory consumption I mean memory footprint
(production memory).
· Removing “eval” from the rules saved ~80mb (10,000 rules, same
environment).
Mark, reading all these clarifications, does 30kb per rule sound
reasonable? Do you think that we can improve this number somehow?
Thank you,
-- Liron
*From:* rules-users-bounces(a)lists.jboss.org [mailto:
rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Leonardo Gomes
*Sent:* Wednesday, April 27, 2011 12:10 PM
*To:* Rules Users List
*Subject:* Re: [rules-users] Memory issue with drools (using 10000 rules)
http://drools.46999.n3.nabble.com/maven-drools-plugin-to-compile-DRL-s-at...
2011/4/27 Geoffrey De Smet <ge0ffrey.spam(a)gmail.com>
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(a)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
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With kind regards,
Geoffrey De Smet
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