Hello Harshit / Mark,

My reasoning behind the yes, is that:

- If you have 10 rules that won't necessarily always match, it's better to use Rete, than sequentially match one-by-one. The tree structure with the sharing of nodes for different rules seems to always be a better approach for me, than sequentially testing one-by-one and, in some cases, retesting the same condition on different rules (if that happens);

- You can write if-then-elses in a imperative language and perform better than Rete, but if your rules are complicated and you have many of them, it's likely that rete can do a better job; Also, if you need to change your rules or add new ones, it will be easier to do that declaratively;

I first put the links, because you can use that to judge yourself whether or not you might gain in performance in your own scenarios, with that material.


@Mark:

In general a stateless session is just a convenience api for stateful, it just wraps. So no performance gain at all.

I think here you're saying that there will be no performance gain compared to a stateful session, but I believe that the question was more on the lines of "I know that with a stateful it's efficient, how about stateless". I tried to say that, yes, it's also worth using Rete in stateless scenarios.

Cheers,
Leo.
 
2010/9/24 Mark Proctor <mproctor@codehaus.org>
On 24/09/2010 16:18, Leonardo Gomes wrote:
Have a look here: http://www.drdobbs.com/184405218

here: http://blog.athico.com/2007/07/sequential-rete.html

and here: http://herzberg.ca.sandia.gov/guidelines.shtml

The easy answer for your question is "Yes" ;-)
It depends :)

In general a stateless session is just a convenience api for stateful, it just wraps. So no performance gain at all.

There is a "sequential" mode, but in all honest you won't get any measurable perf gain. So I wouldn't use sequential mode for performance, the only reason to use it is if you want your rules to execute sequentially.

Mark


Cheers,
Leo.

2010/9/24 Harshit Bapna <hrbapna@gmail.com>
Hi All,

In a scenario where lets say 10 rule are to be fired (in any order) in a stateless session than will I get the benefits of RETE algorithm (i.e increased performance).
i.e Whether the engine will fire all the ten results in a parallel fashion or Whether the engine will file each rule one by one.

How RETE algorithm will improve the performance of the engine for rules fired in stateless session ?


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