[Yum-devel] Dep solving question

[Troy Dawson]

Hi,
There is actually several questions in your e-mail, even though you 
really only end up with 1.  But here are some of the hidden questions, 
leading up to the answer to the one question.

Is yum sometimes slow?
Yes, it can be.  This is being worked on.  The developers are looking at 
both the grand scheme, as well as breaking things down and looking at 
function by function.  Trust me, they really are concerned and are 
working on this.  There are so many details I can't even begin to start, 
so I guess I won't.

Does yum always take over half an hour with a good network connection?
No, not usually.
If you are on fedora core 6 and do a "yum update" I'd be very surprised 
if it took more than 5 minutes.  And after you've done it once, it is 
usually on the order of 30 seconds.
You stated that your Ubuntu only took 5 seconds to get the output of the 
packages to install.  That is probably because you aren't running on a 
fresh batch of data from the servers.  apt tends to cache their data 
much longer.  Last time I used apt, I had to tell it specifically to go 
look at the repositories.

Why is yum taking so long to update from fc6 to rawhide?
That is probably because there are some major dependencies going on. 
rawhide may or may not even be yum'able from fc6.
So, to really answer your question, I'll let you answer the question.
Instead of doing a
   yum update
do a
   yum -d6 update
And then you can see what dependencies it's working on.

Hope this helped somewhat.
Troy

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?

-- 
__________________________________________________
Troy Dawson  dawson at fnal.gov  (630)840-6468
Fermilab  ComputingDivision/LCSI/CSI DSS Group
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