[rules-users] OutOfMemory Error - 3500 Rules

[Knapp, Barry]

So here Is a question then.  

 

If I create 2 rulebases with 2 different rules, does that consume more
permGen space than 1 rulebase with the same 2 rules?

 

Thanks

Barry

 

 

 

From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Edson Tirelli
Sent: Friday, May 02, 2008 9:58 AM
To: Rules Users List
Subject: Re: [rules-users] OutOfMemory Error - 3500 Rules

 


   Barry,

   First of all, aside from permgen issues, if I remember correctly, we
fixed a pretty serious memory leak bug around August/September of last
year. So, I strongly advise you to upgrade to Drools 4.0.7, that is
about to be released.

   Regarding permgen, the best way to save space on it is to (assuming
you are using 4.0.7), share your rulebases as much as possible. Each
rulebase you create consumes a bit of the permgen space. More rulebases
means more space consumed.

   Hope it helps.

   []s
   Edson



2008/5/2 Barry K <barry.knapp at railinc.com>:


Hello,

Has anyone had to resolve out of memory errors with large applications
using
moderatly sized rulebases?
Increasing the permGen any higher does not appear to be an option for
us.

DROOLS Version 4.01

OutOfMemory Error in PermGen space. Our application has ~5000 classes
and
uses ~3500 rules.
Each rules has on average 3 conditions and 2 actions.

The application uses multiple drools rules engines and we load multiple
rulebases into memory.
Would we have a small memory footprint if we combine all of our rules
into a
single rulebase and use agenda filtration to execute the appropriate
rules?
Right now it is cleaner for us to separate the rulebases.

Current settings-
WAS 6.1 on Solaris
Max Heap 2560
Max PermGen 1024

WAS 6.1 throws startup errors if we increase the Max PermGen above 1024,
so
we are looking for alternative solutions.
This seems like a lot of memory for permGen anyway.


Asides:
We do not use WorkingMemoryFileLogger
We have tried using a newer Janino jar but we still encounter the
OutOfMemoryError.


When we have the rules engine running it is extremely fast and we are
very
pleased with being able to create our rules in Decision Table format.
If
you have any suggestions for the above issue that would be great.

What would you estimate the permGen usage would be on a 3500 rule
RuleBase
alone?
--
View this message in context:
http://www.nabble.com/OutOfMemory-Error---3500-Rules-tp17019001p17019001
.html
Sent from the drools - user mailing list archive at Nabble.com.

_______________________________________________
rules-users mailing list
rules-users at lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users




-- 
Edson Tirelli
JBoss Drools Core Development
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20080502/54f932df/attachment.html