llil4vec start
use OpenMP             ( old )    ( next )     ( buf )    (2024-07)
memory consumption     62.4 GB     33.0 GB     29.2 GB     26.8 GB
use boost sort
get properties         32.659s     12.993s     12.186s      7.182s
sort properties        39.399s     33.421s     22.713s     20.518s
vector reduce          75.644s     35.568s     33.045s     23.868s
vector stable sort     31.133s     21.987s     19.845s     14.556s
write stdout            3.206s      3.693s      1.423s      3.108s
total time            182.042s    107.664s     89.214s     69.235s
    count lines      970195200
    count unique     295755152
29612263 5038456270

       real time     3m38.118s   1m50.092s   1m30.368s   1m09.791s
       user         70m13.776s  45m32.094s  47m28.779s  38m18.296s
       sys           2m29.584s   2m20.917s   1m10.917s   0m59.318s