Profiling DMD's Compilation Time with dmdprof

[H. S. Teoh]

On Thu, Nov 08, 2018 at 06:25:06PM +0100, Jacob Carlborg via Digitalmars-d-announce wrote:
> On 2018-11-08 05:16, Manu wrote:
> 
> > 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.
> 
> This is my result on macOS:
> 
> $ $ make -f posix.mak clean
> $ time make -f posix.mak -j 16
> real	0m3.127s
> user	0m5.478s
> sys	0m1.686s
[...]

Result on Debian/Linux (amd64):

real    0m8.445s
user    0m11.088s
sys     0m1.453s


Slower than C++ compilers?! That's impossible.  There must be something
wrong with your setup, or else with your OS.  Dmd is easily one of the
fastest compilers I've ever used, even after the noticeable slowdown
when we started bootstrapping from D. G++, for example, is at least an
order of magnitude slower.  On my system, anyway. YMMV obviously.

(Of course, it depends on what D features you use... template-heavy and
CTFE-heavy code tends to slow it down pretty badly. But still, it's
pretty fast compared to g++.)


T

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