$ perl llildbf.pl big{1,2,3}.txt | cksum
DB_File B-tree database - start
fixed string length=12, threads=8, maps=32
get properties   :     6.918 secs
pack properties  :     0.915 secs
sort packed data :     0.948 secs
write stdout     :     0.763 secs
total time       :     9.548 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llildbf.pl --threads=16 --maps=64 big{1,2,3}.txt | cksum
DB_File B-tree database - start
fixed string length=12, threads=16, maps=64
get properties   :     3.418 secs
pack properties  :     0.530 secs
sort packed data :     0.933 secs
write stdout     :     0.390 secs
total time       :     5.274 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llildbf.pl --threads=24 --maps=64 big{1,2,3}.txt | cksum
DB_File B-tree database - start
fixed string length=12, threads=24, maps=64
get properties   :     2.400 secs
pack properties  :     0.438 secs
sort packed data :     0.935 secs
write stdout     :     0.297 secs
total time       :     4.076 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llildbf.pl --threads=48 --maps=max big{1,2,3}.txt | cksum
DB_File B-tree database - start
fixed string length=12, threads=48, maps=128
get properties   :     1.387 secs
pack properties  :     0.318 secs
sort packed data :     0.934 secs
write stdout     :     0.242 secs
total time       :     2.891 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427