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

[Lars Ingebrigtsen]

Andrea Corallo via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@gnu.org> writes:
> $ git clean -xfd && ./autogen.sh && ./configure --without-x
> --with-nativecomp && time make NATIVE_FAST_BOOT=1 -j16
> [...]
> real    4m19.570s
> user    28m59.958s
> sys     0m48.797s

Just another data point -- on my AMD Ryzen 7 3700X 8-Core Processor,

$ make bootstrap-clean; ./configure; time make NATIVE_FAST_BOOT=1 -j16

real    1m51.603s
user    11m27.197s
sys     0m38.004s

$ make bootstrap-clean; ./configure --with-nativecomp; time make 
NATIVE_FAST_BOOT=1 -j16 

real    3m44.636s
user    27m15.699s
sys     0m53.677s

So it takes about 2x the time to build Emacs on this machine with native
compilation, which isn't so bad.  (And the result is a really snappy and
responsive Emacs. :-))

Of course, the non-native compilation spends a lot of time being
single-threaded, and there's room for improvement there.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no