GDC - program runs in one thread, DMD - in 4 threads, why?

[eugene]

On Friday, 10 September 2021 at 10:20:52 UTC, drug wrote:
> It is off-topic a bit

I am newbie - have been learning D for about 2 months or so.
I understand that my question is not about the language itself,
just picked forum for new users.

> but I think none can compare gdc 4.9.2 to

same picture with gdc 8.4.0 - one thread, no pthread_create() 
behind the scenes.