[gecode-users] Ordering of propagators

[Christian Schulte]

Well, you cannot rely on that no other propagator does it. At least not in
real life...

What are you trying to do? If you have a propagator composed from a cheap
and an expensive stage you might want to consider staged propagation. Just
see the paper I mentioned before. We use it regularly in Gecode to great
benefit.

Cheers
Christian

--
Christian Schulte, http://www.imit.kth.se/~schulte/ 

-----Original Message-----
From: peter.tiedemann at gmail.com [mailto:peter.tiedemann at gmail.com] On Behalf
Of Peter Tiedemann
Sent: Tuesday, April 10, 2007 3:40 PM
To: cschulte at kth.se
Cc: users at gecode.org
Subject: Re: [gecode-users] Ordering of propagators


> What do you mean with how the cost function is used? Could you 
> elaborate, please?

I was just wondering how the cost affected the ordering, but it seems that
this is explained in the reference you just gave me. From a quick scan of
it, it would seem that if i choose the highest cost (and no other
propagators do the same), then i am in fact 100% sure that my propagator
will only be asked to propagate when all other propagators have stabilized,
which is exactly the effect i was hoping for.

Thanks for the quick answer, you guys really have short response times :)

Regards,
Peter Tiedemann