goroutines vs vibe.d tasks

[Laeeth Isharc via Digitalmars-d-learn]

On Tuesday, 30 June 2015 at 15:18:36 UTC, Jack Applegame wrote:
> Just creating a bunch (10k) of sleeping (for 100 msecs) 
> goroutines/tasks.
>
> Compilers
> go:     go version go1.4.2 linux/amd64
> vibe.d: DMD64 D Compiler v2.067.1 linux/amd64, vibe.d 0.7.23
>
> Code
> go:     http://pastebin.com/2zBnGBpt
> vibe.d: http://pastebin.com/JkpwSe47
>
> go version build with     "go build test.go"
> vibe.d version built with "dub build --build=release test.d"
>
> Results on my machine:
>
> go:     168.736462ms (overhead ~ 68ms)
> vibe.d: 1944ms       (overhead ~ 1844ms)
>
> Why creating of vibe.d tasks is so slow (more then 10 times)???

fwiw I have 151ms total time for go; 740 ms for ldc (O2 and 
singleobj), and 760ms for dmd.  on an old zoostorm running 64bit 
arch linux.

microbenchmarks may be testing many strange things, and it 
requires more expertise than I currently have to know where this 
might come from.