[rules-users] Drools Performance

[Ashish Soni]

Great help , Ed.
I appreciate your reply and again thanks for your valuable time.


Regards,
Ashish Soni

On Thu, Feb 12, 2009 at 12:18 PM, Edson Tirelli <tirelli at post.com> wrote:

>    Ashish,
>
> "If i have 10,000 rules with same priority or equal priority then how
> drools engine evaluate them or what is the path it chooses."
>
>    LHS side of rules are evaluated at insert time, as you may know, as this
> is how the Rete algorithm works. At fire time, the engine uses conflict
> resolution strategies to decide which rules to fire. Typically, resolution
> strategy is given by the several grouping capabilities that Drools offers
> (like ruleflow-groups, agenda-groups, etc) and goes down to saliency
> (priority) and finaly a (pseudo) recency.
>
>    Although, if you have 2 rules for which all the parameters are the same
> (groups, priority, etc), your application should't care which one fires
> first, because they are supposed to have the same priority.
>
> "Also if there any performance metrics available ,please point to the
> links."
>
>    This is the most complicate point. There are quite a few benchmarks out
> there, but in the end the performance of your rules is dependent not only on
> the engine itself, but also on how a rule is written and how your domain
> model looks like. A good analogy is to compare it to a database. Everyone
> knows that the quality of the data model, availability of indexes and the
> way your query is written is directly proportional to the query performance.
>
>
>    So, the existing benchmarks will try to derive simple cases that allow
> comparisons between engines, but NONE of the existing benmarks is capable of
> predicting the performance of REAL WORLD applications.
>
>    Just to mention one example: I created a simple test a couple weeks ago
> for something I was doing. I generated 1000 rules, built a rulebase, and
> started feeding facts into the engine and processing them with this 1000
> rules. In my laptop, a LeNovo T61, 2ghz, 2Gb Ram, I was able to process an
> average of 38000 events/second. What does that tell you? We both know that
> it tells you nothing because it depends on the rules I generated and the
> optimizations that these rules were triggering (or not) in the engine.
>
>    So, the one advice we give to users is: build a POC for YOUR use case.
> Take into consideration everything, not only performance. Bottlenecks in
> real world applications that use rules engines will be in 99% of the cases
> on I/O, specially database I/O, meaning that the most important aspect on a
> rules engine for your case will not be performance, but things like rule
> management, language expressiveness, time to market, etc.
>
>    I know it is not the kind of answer managers look for, but it is the
> bare naked truth.
>
>    Hope it helps,
>
>         Edson
>
>
> 2009/2/12 Ashish Soni <learnspring at gmail.com>
>
> Any more response will be appreciated as i am in the final phase of drools
>> evaluation and need this urgently.
>>
>> regards,
>> Ashish
>>
>> On Wed, Feb 11, 2009 at 3:21 PM, Steve Núñez <steve.nunez at illation.com.au
>> > wrote:
>>
>>>  Ashish,
>>>
>>> There are a lot of variables involved in performance benchmarking. Your
>>> scenario is common in many industries, such as insurance, that utilise large
>>> decision tables.
>>>
>>> We have previously published benchmarks comparing various rules engines
>>> at http://illation.com.au/benchmarks, however they don't specifically
>>> address the use case of large rulesets, but instead stress various aspects
>>> of the rules engines.
>>>
>>> We are working to put together a new set of benchmarks that will better
>>> test typical use cases, and we'd welcome your comments and participation. We
>>> are very early in this process, and should have a publically available 'blog
>>> to discuss the topic.
>>>
>>> Regards,
>>>     - Steve Nunez
>>>
>>>
>>>
>>> On 11/02/09 11:37 AM, "Ashish Soni" <learnspring at gmail.com> wrote:
>>>
>>> Hi All ,
>>>
>>> I am not sure if this question is asked previously but it would be great
>>> if any one can put some lights on this ..
>>>
>>> If i have 10,000 rules with same priority or equal priority then how
>>> drools engine evaluate them or what is the path it chooses.
>>>
>>> Also if there any performance metrics available ,please point to the
>>> links.
>>>
>>>
>>> Thanks and Regards,
>>> Ashish soni
>>>
>>>
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>>
>
>
> --
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss, a division of Red Hat @ www.jboss.com
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20090212/80234165/attachment.html