On Sat, Oct 23, 2010 at 07:32:55PM -0600, Bob Proulx wrote:
> P.S. On my 2004 1.8GHz Pentium M laptop:
>
> $ time lsb_release -is
> Debian
>
> real 0m0.135s
> user 0m0.116s
> sys 0m0.016s
[~]# time lsb_release -is
Debian
real 0m9.525s
user 0m6.216s
sys 0m0.652s
[~]# time lsb_release -is
Debian
real 0m0.260s
user 0m0.112s
sys 0m0.052s
[~]# echo 3 >/proc/sys/vm/drop_caches
[~]# time lsb_release -is
Debian
real 0m2.814s
user 0m0.132s
sys 0m0.140s
[~]# apt-get update
...
[~]# echo 3 >/proc/sys/vm/drop_caches
[~]# time lsb_release -is
Debian
real 0m13.134s
user 0m6.376s
sys 0m1.024s
It's both about filesystem cache and about apt's internal caches. If you
run apt-cache as non-root, the latter won't get updated so the long delay
will happen every single time.
In other words, it's not something you want to call when not needed.
--
1KB // Microsoft corollary to Hanlon's razor:
// Never attribute to stupidity what can be
// adequately explained by malice.
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