[CentOS] is yum a complete substitute of rpm?
R P Herrold
herrold at centos.org
Tue Feb 16 15:04:30 UTC 2010
On Mon, 15 Feb 2010, Bowie Bailey wrote:
> I use rpm for basic stuff because it runs faster. For example:
>
> $ time yum list installed
> ...
> real 0m17.069s
> user 0m0.857s
> sys 0m0.675s
>
> $ time rpm -qa
> ...
> real 0m4.714s
> user 0m4.457s
> sys 0m0.120s
>
> Yum tends to take a while to read in its databases before it processes
> your command. So for simple commands, it is faster to use rpm. On slow
> boxes, it can be significantly faster.
naw -- The 'speed' issue here comes down to a scripting
language v a compiled one -- librpm underneath on each in
CentOS 5. Here is a more apple to apples comparison on those
timings on the work being done
[herrold at centos-5 clang]$ time rpm -qa --nosignature \
--nodigest > /dev/null
real 0m0.329s
user 0m0.208s
sys 0m0.076s
[herrold at centos-5 clang]$ time yum list installed > /dev/null
real 0m4.252s
user 0m1.948s
sys 0m0.132s
[herrold at centos-5 clang]$
-- Russ herrold
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