[prev in list] [next in list] [prev in thread] [next in thread] 

List:       suse-kde
Subject:    Re: openSUSE KDE team (was Re: [opensuse-kde] Missing package/update in KDF)
From:       Rajko <rmatov101 () charter ! net>
Date:       2012-09-19 15:44:28
Message-ID: 20120919104428.22808d6f () linux-x2kh
[Download RAW message or body]

On Wed, 19 Sep 2012 10:32:35 +0200
Nico Kruber <nico.kruber@gmail.com> wrote:

> openSUSE:Update uses delta RPMs so it shouldn't be that big

Note that delta rpm saves for sure only on a download traffic, nothing
else. 

As it is now, it will reassemble rpm right after a download, which
with slower machines can take some time, keeping computer busy with
update longer then plain rpm. 

So far I understand, process is:
* download delta to temp copy on a disk, 
* load previously saved rpm, 
* apply delta, 
* save new rpm for installation and later updates. 
Even if it is using RAM as much as possible disk IO is bottleneck that
didn't improve much in last 10 years on consumer class computers. 

When we update package that was never updated we don't have a copy on
disk, so we have to use plain rpm file. Deltas can kick in on next
update, which may, or may not happen. 

In other words savings that delta rpm offers are not that big in a
practice. 

-- 
Regards, Rajko.
-- 
To unsubscribe, e-mail: opensuse-kde+unsubscribe@opensuse.org
To contact the owner, e-mail: opensuse-kde+owner@opensuse.org

[prev in list] [next in list] [prev in thread] [next in thread]