Profiling DMD's Compilation Time with dmdprof

[Manu]

On Wed, Nov 7, 2018 at 10:10 PM Vladimir Panteleev via
Digitalmars-d-announce <digitalmars-d-announce at puremagic.com> wrote:
>
> On Thursday, 8 November 2018 at 04:16:44 UTC, Manu wrote:
> > ...what!? DMD takes me... (compiling) ... 1 minute 40 seconds
> > to build! And because DMD does all-files-at-once compilation,
> > rather than separate compilation for each source file, whenever
> > you change just one line in one file, you incur that entire
> > build time, every time, because it can't just rebuild the one
> > source file that changed. You also can't do multi-processor
> > builds with all-in-one build strategies.
> >
> > 4 seconds? That's just untrue. D is actually kinda slow these
> > days... In my experience it's slower than modern C++ compilers
> > by quite a lot.
>
> It was definitely about 4 seconds not too long ago, a few years
> at most.
>
> It does seem to take more time now; I wonder why.

100 seconds is a lot more than 4... 25x even, that's a pretty big
productivity decline ;)