$ cat /sys/kernel/mm/transparent_hugepage/enabled
[always] madvise never

##</code><code>##

llil4map start                                             
use OpenMP             ( old )    ( next )     ( buf )    (2024-07)
memory consumption     36.6 GB     17.5 GB     16.0 GB     15.0 GB
use boost sort
get properties         12.967s     11.527s     10.402s      7.705s
map to vector           3.244s      1.252s      1.211s      0.743s
vector stable sort     10.265s      8.708s      8.161s      6.546s
write stdout            1.410s      1.388s      1.386s      2.273s
total time             27.887s     22.877s     21.163s     17.268s
    count lines      970195200
    count unique     295755152
29612263 5038456270

       real time     0m43.973s   0m24.872s   0m21.909s   0m17.683s
       user         25m08.532s  22m58.120s  20m56.492s  16m48.601s
       sys           0m55.602s   0m48.783s   0m11.551s   0m08.647s

Note: 2024-07 llil4map_buf2.cc

##</code><code>##

$ ./llil4map_buf2 long* long* long* | cksum
llil4map start
use OpenMP
use boost sort
get properties          7.322 secs
map to vector           0.763 secs
vector stable sort      6.558 secs
write stdout            1.893 secs
total time             16.538 secs
    count lines      970195200
    count unique     295755152
29612263 5038456270

##</code><code>##

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

##</code><code>##

$ ./llil4vec_buf long* long* long* | cksum
llil4vec start
use OpenMP
use boost sort
get properties          7.758 secs
sort properties        19.951 secs
vector reduce          19.847 secs
vector stable sort     13.695 secs
write stdout            1.985 secs
total time             63.237 secs
    count lines      970195200
    count unique     295755152
29612263 5038456270