$ time perl llil_judyhs1.pl big1.txt big2.txt big3.txt >out1.txt
my_test start
get_properties : 10 secs
sort + output  : 5 secs
total          : 15 secs
353468 Kbytes of RAM were used

real  0m14.770s
user  0m14.669s
sys   0m0.084s

$ time perl llil_judyhs2.pl big1.txt big2.txt big3.txt >out2.txt
my_test start
get_properties : 10 secs
sort + output  : 5 secs
total          : 15 secs
473784 Kbytes of RAM were used

real  0m15.073s
user  0m14.938s
sys   0m0.119s