Re: Dependency checking algorithm

[Alexander Todorov <atodorov redhat com>]

Jeremy Katz wrote:
> On Tue, 2007-08-28 at 11:14 +0200, Alexander Todorov wrote:
> > I am looking at the horribly slow installation when packages are 
> > specified explicitly (look for an old e-mail from Jeffrey Law: 
> > Interesting anaconda/yum performance issue).
>
> Jeff then put together a patch for yum based on where I pointed him that
> should have gotten this back to where it "should" be.  And that's been
> in for a while.

Where can I find/test that patch? Any relevant BZ?
Which version of anaconda/yum?
> > Anybody can point me to documentation about dependency checking in 
> > Anaconda? Most of you will say that this is a yum thing but the problem 
> > may be in anaconda not using yum API correctly.
>
> It didn't have anything to do with depchecking; it was purely a matter
> of package _selection_ taking a lot more time.

Yes I realized that after reading the code more carefully.



What I've found is this:
When doing @Everything install things end up in YumBase.install which 
calls ParsePackages -> buildPkgRefDict

On the other hand 'using yum install *' from the console results in
YumBaseCli.installPkgs which uses self.pkgSack.matchPackageNames in this 
case.

I am not quite sure what are the differences but it seems strange.
Why do we have 2 different function/code paths that essentially do the 
same thing, install requested packages?
Also there seems to be some duplicating code in buildPkgRefDict and 
matchPackageNames - creating the NEVRA strings. That's yum 3.2.1-4.

Greetings,
Alexander.