On Tue, Jun 17, 2008 at 12:41:21PM -0430, Patrick O'Callaghan
wrote:
> On Tue, 2008-06-17 at 12:18 -0400, John Poelstra wrote:
> > Shyam said the following on 06/17/2008 12:10 PM Pacific Time:
> > > I've been using Fedora since fedora 6 and it is good to see
improvements
> > > in yum. When compared with ubuntu in the packages which is around
> > > 25000 and fedora which has around 10000, the time taken to download the
> > > package list during the refresh in ubuntu takes lesser time than Fedora.
> > > Is it possible to speed this process.?
> > >
> > > --
> > > Shyam
> > >
> >
> > Just out of curiosity... exactly what is the time different downloading
> > and installing the same package set on Fedora and Ubuntu?
>
> I don't know that it makes much sense to compare download times since in
> general the packages are coming from different servers (and aren't even
> the same sizes). What I do notice is that apt-get and friends on Ubuntu
> are much faster at resolving dependencies, so it may be something about
> the database implementation. For example if I do a "yum update" and a
> minute later do another one, yum takes a while to tell there's nothing
> to be done (even when using the cache), whereas apt-get is almost
> instantaneous.
>
> Here's a quick comparison. Both machines are Intel Core 2 Duos with 2GB
> of RAM. One is Fedora 9, the other is Ubuntu Gutsy. Both are up to date
> with their respective repos, so no network activity is going on here:
>
> Fedora:
> # time yum update
> Loaded plugins: fastestmirror, protectbase, refresh-packagekit
> Loading mirror speeds from cached hostfile
> * livna-development:
mirror.atrpms.net
> * livna:
mirror.atrpms.net
> * google:
dl.google.com
> * fedora: fedora.c3sl.ufpr.br
> * adobe-linux-i386:
linuxdownload.adobe.com
> * localrepo:
> * updates:
ftp.usf.edu
> 0 packages excluded due to repository protections
> Setting up Update Process
> No Packages marked for Update
>
> real 0m5.376s
> user 0m3.611s
> sys 0m0.278s
>
> Gutsy:
>
> $ time sudo apt-get upgrade
That's not an equivalent command. An equivalent would be
sudo apt-get update && sudo apt-get upgrade
yum refreshes its metadata every time it is run.
It doesn't. It refreshes it if metadata_expire seconds (defined
in /etc/yum.conf) have elapsed since the last time it was run. Since I
deliberately updated both systems just before running the test, there
was no network activity. This is explained in the post.
poc