Is it possible to speed up yum.

[Patrick O'Callaghan]

On Thu, 2008-06-19 at 06:39 -0400, seth vidal wrote:
> On Thu, 2008-06-19 at 00:53 -0430, Patrick O'Callaghan wrote:
> > On Wed, 2008-06-18 at 23:43 -0400, seth vidal wrote:
> > > On Wed, 2008-06-18 at 16:19 -0430, Patrick O'Callaghan wrote:
> > > > > 
> > > > > and send the output along.
> > > > 
> > > > # yum -d3 info yum | grep 'time:'
> > > > Config time: 0.182
> > > > rpmdb time: 0.000
> > > > pkgsack time: 7.505
> > > 
> > > It's taking 7.5 seconds to put the package sack together and it's not
> > > downloading ANYTHING? Not even the mirrorlists again or rechecking the
> > > repomd.xml?
> > 
> > Yes.
> > 
> > > I ask b/c the same version on my not-exceptionally-fast laptop is:
> > > 
> > > yum -d3 info yum | grep 'time:'
> > > Config time: 0.106
> > > rpmdb time: 0.000
> > > pkgsack time: 0.345
> > 
> > Interesting.
> > 
> > I ran it again a few times, first doing an update:
> > 
> > [root at bree S3]# 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: ftp.usf.edu
> >  * 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
> > [root at bree S3]# yum -d3 info yum | grep 'time:'
> > Config time: 0.163
> > rpmdb time: 0.000
> > pkgsack time: 2.526
> > [root at bree S3]# yum -d3 info yum | grep 'time:'
> > Config time: 0.168
> > rpmdb time: 0.000
> > pkgsack time: 1.690
> > [root at bree S3]# yum -d3 info yum | grep 'time:'
> > Config time: 0.162
> > rpmdb time: 0.000
> > pkgsack time: 6.976
> > [root at bree S3]# yum -d3 info yum | grep 'time:'
> > Config time: 0.163
> > rpmdb time: 0.000
> > pkgsack time: 1.774
> > [root at bree S3]#
> > 
> > These runs were one after the other in quick succession. What's notable
> > is the large variance in pkgsack time.
> 
> try it like this:
> yum --noplugins -d3 info yum | grep 'time:'

[root at bree S3]# 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: ftp.usf.edu
 * 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
[root at bree S3]# yum --noplugins -d3 info yum | grep 'time:'
Config time: 0.156
rpmdb time: 0.000
pkgsack time: 0.427
[root at bree S3]# yum --noplugins -d3 info yum | grep 'time:'
Config time: 0.148
rpmdb time: 0.000
pkgsack time: 0.385
[root at bree S3]# yum --noplugins -d3 info yum | grep 'time:'
Config time: 0.156
rpmdb time: 0.000
pkgsack time: 0.413
[root at bree S3]# yum --noplugins -d3 info yum | grep 'time:'
Config time: 0.149
rpmdb time: 0.000
pkgsack time: 0.391
[root at bree S3]# yum --noplugins -d3 info yum | grep 'time:'
Config time: 0.151
rpmdb time: 0.000
pkgsack time: 0.404
[root at bree S3]# yum --noplugins -d3 info yum | grep 'time:'
Config time: 0.158
rpmdb time: 0.000
pkgsack time: 0.403

So it's clear that the large variance I saw before is being caused by
one or more of the plugins. However I repeated the experiment using just
one plugin at a time and the variance doesn't come back, so it looks
like some combination.

Just to be sure, I did it yet again with all plugins enabled, and sure
enough it's still there.

poc