[rules-users] optimization on a lot of simple rules

[David Sinclair]

This particular example will benefit from node sharing for the usage
attribute and indexing of the id attribute on Product. If you are seeing
something different, please post your results.

On Sun, Jul 19, 2009 at 9:15 AM, nesta <nesta.fdb at 163.com> wrote:

>
> Hi,
>
> I am a newbie in drools. There are a lot of simple rules in a scenario.
> For example
> rule 1
>    when
>        Product( id ==1, usage == 1)
>        $decision : Decision()
>    then
>         $decision.setValue(1);
> end
>
> rule 2
> when Product( id ==2, usage == 1)
>  $decision : Decision()
> rule 3
> when Product( id ==3, usage == 1)
>  $decision : Decision()
> rule 4
> when Product( id ==4, usage == 1)
>  $decision : Decision()
> rule 5
> when Product( id ==5, usage == 1)
>  $decision : Decision()
> ......
>
> I have a Product fact whose id = 5 and usage = 1, in my first thinking,
> only
> rule 5 is matched, there should be not much more different between 1 rule
> and a lot of rules in runtime.
>
> But the result shows that they are different. More rules will cost more
> time. If there are 1 thousand rules, some Node and Sink will execute 1
> thousand times.
>
> My question is how to optimize this scenario?
> --
> View this message in context:
> http://www.nabble.com/optimization-on-a-lot-of-simple-rules-tp24556724p24556724.html
> Sent from the drools - user mailing list archive at Nabble.com.
>
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