$ time perl demo.pl > out.in
real   0m01.396s
user   1m16.659s
sys    0m00.287s

$ rm -f out; ./llil4map2 out.in > out
llil4map start
use OpenMP            SSO_LIMIT 12  SSO_LIMIT 20
use boost sort        
get properties         0.166 secs    0.159 secs
map to vector          0.055 secs    0.077 secs
vector stable sort     0.201 secs    0.113 secs
write stdout           0.097 secs    0.068 secs
total time             0.521 secs    0.419 secs
    count lines     16000000
    count unique    16000000