Profiling DMD's Compilation Time with dmdprof

[Manu]

On Wed, Nov 7, 2018 at 10:30 PM Joakim via Digitalmars-d-announce
<digitalmars-d-announce at puremagic.com> wrote:
>
> On Thursday, 8 November 2018 at 04:16:44 UTC, Manu wrote:
> > On Tue, Nov 6, 2018 at 10:05 AM Vladimir Panteleev via
> > Digitalmars-d-announce <digitalmars-d-announce at puremagic.com>
> > wrote:
> >> [...]
> >
> > "Indeed, a clean build of DMD itself (about 170’000 lines of D
> > and 120’000 lines of C/C++) takes no longer than 4 seconds to
> > build on a rather average developer machine."
> >
> > ...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 sounds like you're not using "a rather average developer
> machine" then, as there's no way DMD should be that slow to build
> on a core i5 or better:
>
> https://forum.dlang.org/post/rqukhkpxcvgiefrdcvdq@forum.dlang.org

I'm on an i7 with 8 threads and plenty of ram... although threads are
useless, since DMD only uses one ;)