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

[nesta]

Because only one Decision instance is in working memory, so I change the
rule, and make Decision as global, not a fact. The rule is changed as
follows:

global Decision decision;
 rule 1
    when
        Product( id ==1, usage == 1)
    then
         $decision.setValue(1);
 end
.....

Scenario:
1000 rules
1000 times execution

The result shows it improves a lot. The previous rulesets spend more than
100ms, but this time they spend only 10ms.

So I guess that more time is cost in JoinNode ( between Product and Decision
). Is it reasonable?



dave sinclair wrote:
> 
> 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?
>> --
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>> Sent from the drools - user mailing list archive at Nabble.com.
>>
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>>
> 
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