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Re: [p2-dev] Resolver priority question

Hi Thomas,

The resolver tries to install as few IUs as possible, because each installed IU is associated with a penalty.

Furthermore, there is also another rule which will prefer most recent versions to older ones.
It means that the penalty is smaller for most recent versions than for older versions.

So it means that when you use the most recent IUs, solutions with fewer installed IUs will be preferred to solutions with a higher number of IUs.

But since at the end we aggregate all penalties, there might be some compensation effects:
a solution installing many new recent IUs may be preferred to a solution installing a few older IUs.

Daniel

Le 4 sept. 2013 à 19:23, Thomas Hallgren <thomas@xxxxxxx> a écrit :

> Confronted with two OK solutions, what would the p2 resolver do if one solution was resolved by brining in a higher number of IUs? If it prefers the one with a lower IU count, what does it do if that one satisfies some requirements with lower versions?
> 
> - thomas
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--
          Daniel Le Berre     mailto:leberre@xxxxxxx
          MCF-HDR, CRIL-CNRS UMR 8188 Universite d'Artois
          http://www.cril.univ-artois.fr/~leberre