$ perl llilsql.pl big{1,2,3}.txt | cksum
Tie::Hash::DBD SQLite database - start
fixed string length=12, threads=8, maps=32
get properties   :     5.123 secs
pack properties  :     0.893 secs
sort packed data :     0.949 secs
write stdout     :     0.745 secs
total time       :     7.713 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llilsql.pl --threads=16 --maps=64 big{1,2,3}.txt | cksum
Tie::Hash::DBD SQLite database - start
fixed string length=12, threads=16, maps=64
get properties   :     2.927 secs
pack properties  :     0.518 secs
sort packed data :     0.944 secs
write stdout     :     0.396 secs
total time       :     4.792 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llilsql.pl --threads=24 --maps=64 big{1,2,3}.txt | cksum
Tie::Hash::DBD SQLite database - start
fixed string length=12, threads=24, maps=64
get properties   :     2.074 secs
pack properties  :     0.450 secs
sort packed data :     0.940 secs
write stdout     :     0.275 secs
total time       :     3.747 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llilsql.pl --threads=48 --maps=max big{1,2,3}.txt | cksum
Tie::Hash::DBD SQLite database - start
fixed string length=12, threads=48, maps=128
get properties   :     1.432 secs
pack properties  :     0.297 secs
sort packed data :     0.939 secs
write stdout     :     0.255 secs
total time       :     2.934 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427