dmd-built dmd is faster that ldc-built dmd or gdc-built dmd?

[Iain Buclaw via Digitalmars-d]

On Friday, 11 March 2016 at 13:39:04 UTC, Vladimir Panteleev 
wrote:
> Hi,
>
> In the process of setting up a new development environment, I 
> noticed that DMD's codegen seems to outperform GDC's or LDC's 
> when building DMD itself.
>
> I wrote a test script to measure the time it takes for DMD 
> (built with different compilers) to build Phobos:
>
> http://dump.thecybershadow.net/9e42ff2858d1419cf41108cc50b0a83a/bench.sh
>
> My results are:
>
> dmd: 11.26
> ldc: 15.35
> gdc: 14.80
>


https://github.com/D-Programming-Language/dmd/blob/master/src/root/rmem.d#L166-L193

How memory is allocated makes a huge difference.