Array Appending and DRuntime

[Andrei Alexandrescu]

bearophile wrote:
> dsimcha:
>> DMD 2.019 (Last release before druntime):  42 milliseconds.
>> DMD 2.020 (First release with druntime):  ~1000 milliseconds.
>> DMD 2.029 (Current version):  ~1000 milliseconds.
>> DMD 2.029 (Replacing ~= with the Appender struct):  18 milliseconds.
>> DMD 2.029 (Replacing builtin array with rangeextra.TNew):  19 milliseconds.
> 
> I have done some more timings:
> 
> Timings, appending 100_000_000 uints, seconds:
>   DMD 1.042:                 7.51
>   DMD 1.042, ArrayBuilder:   1.81
>   DMD 2.029:                 a lot
>   DMD 2.029, Appender:      22.83

I'm not sure on what machine you test, but on my (crappy old) laptop, 
your Appender example completes in 4.95 seconds. Are you sure you are 
measuring the right thing?

Andrei