Inplace array - reduce GC usage

[Gary Willoughby via Digitalmars-d]

On Saturday, 18 April 2015 at 10:49:01 UTC, Nikolay wrote:
> I wrote simple proof of concept library. The main aim is to
> reduce GC usage and improve data locality by replacing dynamic
> array for small immutable arrays.
>
>
> You can find more info here:
>    * wiki - https://bitbucket.org/sibnick/inplacearray/wiki/Home
>    * source code - 
> https://bitbucket.org/sibnick/inplacearray/src
>
> I include small demo - word counter. This program builds AA 
> array
> (word => counter) for given text file in UTF-8. It is possible
> switch between builtin array/string and inplace array by 
> changing
> one line code. I used:
>
>    -  unpacked List of all page titles -
> https://dumps.wikimedia.org/enwiki/20150304/enwiki-20150304-all-titles.gz
> as test sample.
>    - Ubuntu 14.04 x64
>    - dmd 2.67.0
>    - dub build -b release
>    - ./inplace_array --DRT-gcopt=profile:1 test_big.txt
>
> Here results.
>
> Buildin string:
> GC summary: 1355 MB, 12 GC 5659 ms, Pauses 3116 ms < 1436 ms
>
> Inplace array:
> GC summary: 715 MB, 22 GC 5281 ms, Pauses 4207 ms < 938 ms
>
> As you can see it is possible noticable reduce memory allocation
> (1355Mb -> 715Mb) and max pause time (1436ms -> 938ms).
>
> So it is possible improve situation with GC from new side.

This reminds me of another useful library here:

https://bitbucket.org/infognition/dstuff/src/

See gcarena.d