I've thought about some callback mechanism that is executed when a rule is no longer true, the problem I have is which variable changed to make the rule no longer true and how do I expose the bound variables to the user, especially if the rule is no longer true due to a retraction, and ofcourse I need to figure our the DRL syntax that makes sense.

I've thought about doing it as a sort of logical closure, so you have to declare the data:
insertLogicalClosure( new LogicalClosure() {
execute() {.......}
} )

Not sure how to make the data accessible, maybe the user should have to populate the map. Anyway idea is in the same way that a logical insert is executed when the rule is true, the logical closure/method is executed.

So if someone has some time and fun, maybe they would work on this and submit a patch :)

Mark

Anstis, Michael (M.) wrote:

Do you use a stateful session?

Are your measurements before and after you've inserted facts into working memory?

Would be helpful to the group to post your use-case source?

Thanks,

Mike

From: rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Roger Tanuatmadja
Sent: 29 July 2008 02:12
To: Rules Users List
Subject: [rules-users] Measuring Drools Memory Usage

Hi,

Has anyone attempted to measure the incremental memory usage of using Drools? Anyone cares to share their methodology?

I am currently following the following methodology:

1. Prevent garbage collection from happening by using large Xms Xmx (1024m in my case), a NewRatio of 2 (I am sure other sizes will work as well) and verbogegc enabled to confirm that no garbage collection is happening.

2. Use Runtime.freeMemory before and after fireAllRules and measuring the difference.

The problem with my methods so far has been that after a positive memory usage (indicating you are using memory), subsequent use case (the same one) incurs zero memory usage which is very strange.

So I guess my question is 2 fold: anyone care to share their methodology, and can anyone see what's wrong with mine?

Thanks,

Roger
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