[rules-users] Drools STREAM Mode performance with rather simple rule

[Wolfgang Laun]

Do you mean that insert ("send") Y times A inserts Y times Aevent with the
very same id?!

If so, you will have to reconsider your approach because you are creating
the worst possible scenario for the Rete algorithm, i.e., O(n^3) cartesian
tuples for your activations.

There are strategies for countering this. A full(er) description of other
requirements (if any) for this A-B-C rule would be necessary for doling out
good advice.

-W


2010/11/15 Roess. Oliver <o.roess at seeburger.de>

>
>  Hello again.
>
>
>
> Thanks for your test Wolfgang. When I do it like you did, I get approx. the
> same results. But you misunderstood my scenario. I don’t want to send ABC x
> times. Here’s what I meant in pseudocode.
>
>
>
> for ( i = 0; i < X; i++)
>
>             Send Y times A
>
>             Send Y times B
>
>             Send Y times C
>
>
>
> I dropped the idea of calling fireUntilHalt() and now I call fireAllRules
> after every single insert, just to be quick. This avoids the problem of
> getting random execution durations. Now I produce nearly constant times
> every time I execute this. But it is still not very satisfying. These are
> just a few hundred events. In a real business scenario it will be a lot
> more. Increasing X will cause the time to go up linearly which is ok, but
> increasing Y will have the time go up overproportional, which is not
> acceptable. We will evaluate this now with a really good machine. But it
> would be interesting to see what results others achieve in this scenario.
>
>
>
> Best regards,
>
> Oliver
>
>
>
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