I think Andreas Andreakis wrote:
> But, when I ran it with both rules it takes more then 3 secs. I
> understand why this happens (pattern mathing problem), but I dont
> understand why I face the same problem while using Modules. The docs
> say, that rules contained in a Module do not consider information in
> other modules, unless they are referensed directly over their Modules
> namespace. Maybe I missunderstood ?
>
I think you've made things more complex in your head than they really
are. The template "triple" is shared by all modules. It doesn't matter
what module a fact is asserted in. All rules that match that template
see all the facts.
> I will try your suggestion. But in general I_m interessted to see
> whether it is possible to solve the performance issue using the more
> generic triple Fact.
Writing something like
(defrule foo
(triple ...)
(triple ...)
(triple ...)
(triple ...)
Is equivalent to something in Java like
List triples = ...
for (int i=0; i<triples.size(); ++i)
for (int j=0; j<triples.size(); ++j)
for (int k=0; k<triples.size(); ++k)
for (int m=0; m<triples.size(); ++m)
Jess tries to be very clever, and definitely succeeds in making this
go faster than the worst-case O(N^4), but you have to help as much as
you can. Using separate templates is of course a great help, and
paying attention to pattern-ordering helps too. Try to put the pattern
that will match the fewest facts first, and put the pattern that
matches the facts that will change the most last.
---------------------------------------------------------
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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