$ NUM_THREADS=48 ./llil4emh in/biga* | cksum
llil4emh (fixed string length=12) start
use OpenMP
get properties         1.170 secs    0.924 secs
map to vector          0.184 secs    0.408 secs
vector stable sort     0.477 secs    0.422 secs
write stdout           1.526 secs    0.325 secs
total time             3.438 secs    2.080 secs
    count lines     91395200
    count unique    79120065
2005669956 712080585

$ NUM_THREADS=48 ./llil4hmap in/biga* | cksum
llil4hmap (fixed string length=12) start
use OpenMP
get properties         1.210 secs    0.866 secs
map to vector          0.224 secs    0.377 secs
vector stable sort     0.476 secs    0.416 secs
write stdout           1.460 secs    0.249 secs
total time             3.372 secs    1.910 secs
    count lines     91395200
    count unique    79120065
2005669956 712080585

$ NUM_THREADS=48 ./llil4umap in/biga* | cksum
llil4umap (fixed string length=12) start
use OpenMP
get properties         3.928 secs    2.047 secs
map to vector          4.345 secs    1.413 secs
vector stable sort     0.473 secs    0.455 secs
write stdout           1.468 secs    0.264 secs
total time            17.163 secs    4.180 secs
    count lines     91395200
    count unique    79120065
2005669956 712080585