first numbers: type function vs template

[Stefan Koch]

On Friday, 21 August 2020 at 19:13:30 UTC, Stefan Koch wrote:
> And it results in:
> Benchmark #1: generated/linux/release/64/dmd 
> test_getBaseClass.d -sktf -o-
>   Time (mean ± σ):      21.4 ms ±   2.8 ms    [User: 16.8 ms, 
> System: 4.9 ms]
>   Range (min … max):    14.0 ms …  29.3 ms    500 runs
>
> Benchmark #2: generated/linux/release/64/dmd 
> test_getBaseClass.d -sktf -version=templ -o-
>   Time (mean ± σ):      33.0 ms ±   2.6 ms    [User: 26.9 ms, 
> System: 6.3 ms]
>   Range (min … max):    24.9 ms …  41.6 ms    500 runs
>
> Summary
>   'generated/linux/release/64/dmd test_getBaseClass.d -sktf 
> -o-' ran
>     1.54 ± 0.24 times faster than 
> 'generated/linux/release/64/dmd test_getBaseClass.d -sktf 
> -version=templ -o-'

Actually I was mislead by the results.

I forgot to subtract the overhead.
A file with the content "class C0{}"
takes on the same machine and comparable load 8.5 milliseconds.
Let's be generous and round it down to 8 milliseconds.

That means the real speedup is (33.0 - 8) / (21.4 - 8).
And with that we are at almost 1.9x on average.
If we compare the two min values: (24.9 - 8) / (14.0 - 8)
We are even at 2.8x.