Re: [rules-users] Drools 5 Memory Issues
On 27/12/2011 21:16, drools.user wrote:
We are planning on moving from Drools 3.0.5 to Drools 5.2.0. In Load
Testing
of Drools 5.2, we faced some issues:
1. KnowledgeBaseImpl Object in Drools 5 is almost 50% bigger than
ReteooRuleBase Object of Drools 3.
2. The server heap memory usage keeps on increasing during Load Testing to
finally give OutOfMemory error and crash.
Try 5.4 beta 1 - there have been a lot of
fixes of listeners not being
removed, some related to memory leaks over 5.2, 5.3 and 5.4.
We are using StatefulKnowledgeSession and calling dispose() after
fireAllRules().
So, the questions we have are:
1. Looking at the heap snapshot, we noticed> 300,000 Objects for some of
Drools Classes (e.g. org.drools.reteoo.LeftTupleImpl) occupying> 25MB in
heap memory. Is that normal?
2. Is there any Memory Leak issues with Drools 5?
3. What is the advantage of using KnowledgeBase vs RuleBase? Is it fine to
use RuleBase in Drools 5?
KnowledgeBase is just a wrapper for the legacy rulebase
impl. The
downside is that rulebase will be removed soon - you need to use classes
in the -api to ensure longer term compatability.
4. We are using Drools 5.2. Has anything changed significantly in Drools
5.3? Will moving to that help in our memory issues?
See above about listeners not
being removed.
Thanks
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