[rules-users] Re: Drools and BRMS (60,000+ rules)

[Carlsen, Len]

This is very cool and is exactly what we will need for our new open
source SIS. Once we have designed our BRMS then we will look more
closely at Drools Solver (especially after the ITC competition).  

Currently, we are using Ad Astra for our course timetabling and exam
scheduling and it would be good if we could replace that with Solver.

Thanks for your interest,

Len

-----Original Message-----
From: rules-users-bounces at lists.jboss.org
[mailto:rules-users-bounces at lists.jboss.org] On Behalf Of Geoffrey De
Smet
Sent: Friday, November 23, 2007 5:09 AM
To: rules-users at lists.jboss.org
Subject: [rules-users] Re: Drools and BRMS (60,000+ rules)


Mark Proctor wrote:
> Carlsen, Len wrote:
>>
>>
>> Other issues are the performance of the Drools Solver and having 
>> thousands of rules compiled, loaded and running. During registration 
>> we could have thousands of rules executing concurrently. The rules 
>> engine and the BRMS would be services as part of an SOA
infrastructure 
>> (and an OSGi service environment).  Anyone got any experience with 
>> Drools in an OSGi environment with respect to class loading issues 
>> when compiling rules and facts from other bundles since rules and 
>> facts may be in different bundles? Bundle buddy class loading?
>>
> No but it is something that interests us, please give us your OSGi 
> feedback. Solver is not currently a supported product, its very much
R&D 
> alphaware, but I'm sure geoffrey would love your feedback, good to see

> people are evaluating it.

yes, feedback on solver is very welcome :)

The good news is, I am now working on an example called Examination,
which is an implementation for the itc2007 examination competition:
http://www.cs.qub.ac.uk/itc2007/examtrack/exam_track_index_files/exameva
luation.htm
It's based on real-world data. The "starter" dataset contains 7883 
students, 607 exams, 54 periods and 7 rooms. There are 5 hard 
constraints and 7 soft constraints:
http://www.cs.qub.ac.uk/itc2007/examtrack/exam_track_index_files/exameva
luation.htm

The bad news is, it's not performing yet, because I need to make a 
scalable selector implementation, which I am working on.

There's an example called lesson schedule (which schedules courses), but

that's just a toy example to learn drools-solver, at it just has 2 hard 
constraints.

One piece of advice though: separate the solver part from the rest. Once

  the solver starts calculating, you 'll only want to have score-related

rules in the rulebase. The solver can easily do a million fireAllRules 
per minute, so every performance loss is blown up.

With kind regards,
Geoffrey De Smet

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