$ NUM_THREADS=12 ./llil4map big{1,2,3}.txt | cksum
llil4map (fixed string length=12) start
use OpenMP
use boost sort
get properties         0.311 secs
map to vector          0.055 secs
vector stable sort     0.095 secs
write stdout           0.036 secs
total time             0.500 secs
    count lines     10545600
    count unique    10367603
2956888413 93308427

$ NUM_THREADS=12 ./llil4vec big{1,2,3}.txt | cksum
llil4vec (fixed string length=12) start
use OpenMP
use boost sort
get properties         0.170 secs
sort properties        0.061 secs
vector reduce          0.017 secs
vector stable sort     0.065 secs
write stdout           0.047 secs
total time             0.362 secs
    count lines     10545600
    count unique    10367603
2956888413 93308427