$ ./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