$ perl llilmma.pl big{1,2,3}.txt | cksum
IPC::MMA shared memory hash - start
fixed string length=12, threads=8, maps=256
get properties   :     6.677 secs
pack properties  :     0.781 secs
sort packed data :     0.935 secs
write stdout     :     0.734 secs
total time       :     9.131 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llilmma.pl --threads=16 --maps=64 big{1,2,3}.txt | cksum
IPC::MMA shared memory hash - start
fixed string length=12, threads=16, maps=512
get properties   :     3.189 secs
pack properties  :     0.462 secs
sort packed data :     0.941 secs
write stdout     :     0.383 secs
total time       :     4.983 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llilmma.pl --threads=24 --maps=64 big{1,2,3}.txt | cksum
IPC::MMA shared memory hash - start
fixed string length=12, threads=24, maps=512
get properties   :     2.388 secs
pack properties  :     0.332 secs
sort packed data :     0.942 secs
write stdout     :     0.294 secs
total time       :     3.962 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427

$ perl llilmma.pl --threads=48 --maps=max big{1,2,3}.txt | cksum
IPC::MMA shared memory hash - start
fixed string length=12, threads=48, maps=1024
get properties   :     1.441 secs
pack properties  :     0.409 secs
sort packed data :     0.935 secs
write stdout     :     0.223 secs
total time       :     3.024 secs
    count lines  : 10545600
    count unique : 10367603
2956888413 93308427