[Yum-devel] Dep solving question

[seth vidal]

On Mon, 2007-01-15 at 01:06 -0500, Ahm ed wrote:
> I am currently Trying to upgrade from fc6 to rawhide. the "dep
> solving" part before you get the nice list of packages to be updated
> has taken me over half an hour (at this time it's still going). My
> install  was made using the live-cd installer made by david z.  (very
> basic, no OOo or anything major besides gnome). The only packages I
> added to this were rhgb and madwifi (if I recall correctly). Why ist
> his update taking so long? (I understand it's a pretty big jump but
> still..)
> 
> On my Ubuntu partiont which I had for many many months with many
> packages installed took no more than 5 seconds to give me the output
> of packages to install.
> 
> I really like the yum tool and I have been watching this list, and it
> seems that plans exsist for switching the yum database, will this
> improve the dep-solving speed? From my experiance using yum (fc4-fc6)
> the slowest aspect seems to be the dep-solving. I know this has many
> issues involved with it, but internet speed *should not* be an aspect
> here. My connection is 1.5mbps (usually downloads from fedora serevers
> go at ~ 130kps not the greatest speeds, but still very acceptable.
> 
> What is it about dep-solving in yum that makes it take so long, and
> what ways/plans exsist to improve this?

in 3.0.3 we added in some dep solving timing output. I believe you can
run yum -d 5 update and it will print out how long each dep took to
solve. An interesting test would be to see how much time is being spent
downloading vs finding the hdr to download.

Could you give that a shot so we can see what you're seeing?

thanks,
-sv