> time perl dupsort.pl u 1e6 "1e9-1-int(rand(1e9))"
999498 unique items sorted.(9)
51.254s sort, 0.891s init.
real    0m52.371s
user    0m52.059s
sys     0m0.284s
 > time perl dupsort.pl d 1e6 "1e9-1-int(rand(1e9))"
1000000 total items sorted.(9)
53.015s sort, 0.929s init.
real    0m54.151s
user    0m53.411s
sys     0m0.640s
 > time perl dupsort.pl u 1e6 "1e9-1-int(rand(1e9))"
999459 unique items sorted.(9)
51.574s sort, 0.863s init.
real    0m52.634s
user    0m52.119s
sys     0m0.480s
 > time perl dupsort.pl d 1e6 "1e9-1-int(rand(1e5))"
1000000 total items sorted.(9)
47.990s sort, 1.017s init.
real    0m49.207s
user    0m48.675s
sys     0m0.512s
 > time perl dupsort.pl u 1e6 "1e9-1-int(rand(1e5))"
99998 unique items sorted.(9)
43.938s sort, 0.938s init.
real    0m44.949s
user    0m44.639s
sys     0m0.296s
 > time perl dupsort.pl u 1e6 "1e9-1-int(rand(1e4))"
10000 unique items sorted.(9)
36.991s sort, 0.869s init.
real    0m37.921s
user    0m37.398s
sys     0m0.416s
 > time perl dupsort.pl d 1e6 "1e9-1-int(rand(1e4))"
1000000 total items sorted.(9)
47.022s sort, 0.893s init.
real    0m48.104s
user    0m47.619s
sys     0m0.464s
 > time perl dupsort.pl d 1e6 "1e9-1-int(rand(1e3))"
1000000 total items sorted.(9)
45.959s sort, 0.879s init.
real    0m47.030s
user    0m46.555s
sys     0m0.448s
 > time perl dupsort.pl u 1e6 "1e9-1-int(rand(1e3))"
1000 unique items sorted.(9)
29.405s sort, 0.876s init.
real    0m30.344s
user    0m30.106s
sys     0m0.232s
 > time perl dupsort.pl u 1e6 "1e9-1-int(rand(1e2))"
100 unique items sorted.(9)
22.611s sort, 0.909s init.
real    0m23.581s
user    0m23.201s
sys     0m0.244s
 > time perl dupsort.pl d 1e6 "1e9-1-int(rand(1e2))"
1000000 total items sorted.(9)
41.071s sort, 0.907s init.
real    0m42.182s
user    0m41.619s
sys     0m0.500s
 > time perl dupsort.pl d 1e6 "1e9-1-int(rand(1e1))"
1000000 total items sorted.(9)
39.703s sort, 0.886s init.
real    0m40.794s
user    0m39.874s
sys     0m0.524s
 > time perl dupsort.pl u 1e6 "1e9-1-int(rand(1e1))"
10 unique items sorted.(9)
15.511s sort, 0.906s init.
real    0m16.479s
user    0m16.305s
sys     0m0.160s
 > time perl dupsort.pl u 1e6 "1e9-1-int(rand(1e0))"
1 unique items sorted.(9)
10.219s sort, 0.861s init.
real    0m11.145s
user    0m10.961s
sys     0m0.180s
 > time perl dupsort.pl d 1e6 "1e9-1-int(rand(1e0))"
1000000 total items sorted.(9)
36.356s sort, 0.857s init.
real    0m37.483s
user    0m36.978s
sys     0m0.508s