bug#43269: 28.0.50; [feature/native-comp] provide a user feedback on Emacs being native compiled

[Andrea Corallo]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Andrea Corallo <akrl@sdf.org>
>> Cc: rms@gnu.org,  arthur.miller@live.com,  43269@debbugs.gnu.org
>> Date: Wed, 09 Sep 2020 18:15:51 +0000
>> 
>> > So what do you have there, an i9 CPU?  In any case, 4 min with -j16 is
>> > quite a lot.
>> 
>> It's Xeon from three yeas ago (8 real cores).  It's 4 mins because our
>> build is not very parallel.
>> 
>> But that said I think what matters it the total CPU time (here ~30min)
>> to be compared against the same for the vanilla build (~12min).  This is
>> about what one would get at -j1.
>
> No, what matters to users is the elapsed time.  And that cannot be
> simply estimated as the total CPU time.

To my knowledge and for my experience with this workload this is a
decent estimation of the conversion factor.

It should be said that, as we have improved compilation speed already by
about a factor five, we may be able to improve it further.  But this is
where we stand today.

> Anyway, thanks for the data (and all your hard work on this).

Welcome, I really enjoy to work on this with you all.

  Andrea