There are indeed such rules; some are in the Jess manual (esp. the
Rete algorithm chapter) and FAQ. The most important rules are to be as
specific as possible in matching the earliest patterns on a LHS, and
to put the most-often-changing facts at the end of a LHS.
In this case, probably you've accidentally coded up an n^2 (or worse)
search algorithm. Look in the FAQ for a specific example of this kind
of problem (http://herzberg.ca.sandia.gov/jess/FAQ.html#Q10) .
I think Skokan, Ladislav wrote:
[Charset iso-8859-1 unsupported, filtering to ASCII...]
> Hello Jess users
>
> I have tried to implement an expert system in Jess. I have generated about
> 3000 facts. The structure was like deffacts and here is one typical example:
> (deffact node35 (link "/abc") (name "abc") (super "/"))
>
> All theses links are linked by the slot super and link. I have created
> defrule, that is listing and searching in the tree. I have also used my user
> function created in Java, to make regular expression when searching first
> fact.
> Unfortunately the performance is very low. It is in minutes and I can accept
> response in few seconds only on PC with Linux and Sun's Java.
>
> Does anybody have similar experience ? Should I change Java runtime
> environment ? Is there any general performance rules for Jess ?
>
> Thanx,
> Laco Skokan.
>
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
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PO Box 969 http://herzberg.ca.sandia.gov
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