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[opensuse] Re: [opensuse-factory] How many seconds does "time rpm -qa | wc" cost it?
On 09/15/2014 07:56 AM, Carlos E. R. wrote:
On 2014-09-15 11:04, 1xx wrote:
Hi all:

How many seconds does "time rpm -qa | wc" cost it in your OS?

About a minute and a half. Not "seconds".

Telcontar:~ # time rpm -qa | wc
6154 6154 240152

real 1m20.028s
user 0m2.875s
sys 0m1.735s
Telcontar:~ #
Telcontar:~ # time rpm -qa | wc -l

real 0m2.877s
user 0m2.665s
sys 0m0.213s
Telcontar:~ #

This is on 13.1 on real hardware, with 8 GiB RAM, and a quad core2 cpu
(Q9550 @ 2.83GHz), and reasonably good rotating disks, almost idling.

Notice the huge difference between the first and second runs, which
proves that the slag in on the disk and database, as Jan Engelhardt says.

Telcontar:~ # l -h /var/lib/rpm/Packages
-rw-r--r-- 1 root root 348M Sep 15 13:49 /var/lib/rpm/Packages

Why does it take so long? Here are my results:

# time rpm -qa | wc
1806 1806 61731

real 0m0.613s
user 0m0.504s
sys 0m0.050s

This is on a quad core with hyperthreading & 16 GB.
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