$ NUM_THREADS=24 NUM_MAPS=96 ./llil4tkh big{1,2,3}.txt | cksum
llil4tkh (fixed string length=12) start
sharding managed by the tkrzw::ShardDBM library
use OpenMP
use boost sort
get properties         0.564 secs   18.698 mil QPS
shardDBM to vector     0.352 secs
vector stable sort     0.078 secs
write stdout           0.206 secs
total time             1.202 secs
    count lines     10545600
    count unique    10367603
2956888413 93308427

# Results for 26 big files:

$ NUM_THREADS=24 NUM_MAPS=96 ./llil4tkh in/biga* | cksum
llil4tkh (fixed string length=12) start
sharding managed by the tkrzw::ShardDBM library
use OpenMP
use boost sort
get properties         4.355 secs   20.986 mil QPS
shardDBM to vector     1.789 secs
vector stable sort     0.667 secs
write stdout           1.577 secs
total time             8.389 secs
    count lines     91395200
    count unique    79120065
2005669956 712080585

$ NUM_THREADS=48 NUM_MAPS=128 ./llil4tkh in/biga* | cksum
llil4tkh (fixed string length=12) start
sharding managed by the tkrzw::ShardDBM library
use OpenMP
use boost sort
get properties         2.858 secs   31.979 mil QPS
shardDBM to vector     1.412 secs
vector stable sort     0.663 secs
write stdout           1.553 secs
total time             6.488 secs
    count lines     91395200
    count unique    79120065
2005669956 712080585

# One billion+ lines (312 big files)

$ NUM_THREADS=48 NUM_MAPS=128 ./llil4tkh \
   in/biga* in/biga* in/biga* in/biga* in/biga* in/biga* \
   in/biga* in/biga* in/biga* in/biga* in/biga* in/biga* \
| cksum
llil4tkh (fixed string length=12) start
sharding managed by the tkrzw::ShardDBM library
use OpenMP
use boost sort
get properties        28.506 secs   38.474 mil QPS
shardDBM to vector     1.456 secs
vector stable sort     0.645 secs
write stdout           1.453 secs
total time            32.062 secs
    count lines     1096742400
    count unique    79120065
3625599930 791200650