D create many thread

[Gregor Mückl]

On Wednesday, 5 February 2020 at 15:54:23 UTC, Steven 
Schveighoffer wrote:
> I think we should be more selective about when we make parallel 
> threads to scan (maybe above a certain size of used memory?).
>
> -Steve

That threshold would have to adapt to each system. How about 
delaying thread startup until the first actual mark phase or the 
first run after the first 100ms of runtime or so? The main goal 
should be to minimize the runtime impact. It doesn't even make 
sense to me to run a GC cycle for a program that runs for a 
extremely short time only.