Tracing where build time is spent

[Luboš Luňák]

On Tuesday 18 of February 2020, Jan-Marek Glogowski wrote:
> Am 17.02.20 um 22:02 schrieb Luboš Luňák:
> > $ time tar xf boost_1_71_0.tar.bz2
> >
> > real    4m43.122s
> > user    0m25.077s
> > sys     1m5.514s
>
> Ughh.
>
> Still - the point I was trying to make is that the unpack with your
> setup just hits one core and nobody is actually waiting in that
> seemingly half-empty timespan in the log. So the build would save ~10s,
> if you can cut this time in half.

 Not everyone has 16 cores. Moreover, even if it saves just a little, the cost 
of the repacking is tiny and unpacking happens often, so it's still worth it.

-- 
 Luboš Luňák
 l.lunak at collabora.com