Firstly, 32-bit perl 5.12.3 on Windows: 
C:\_32\pscrpt>perl buk.pl -T=1 phrases.small >out.txt
Started Thu Mar 24 04:52:24 2011
1000000 14225.3834185375 at buk.pl line 30, <> line 1000000.
Ended Thu Mar 24 04:53:40 2011

C:\_32\pscrpt>perl buk.pl -T=2 phrases.small >out.txt
Started Thu Mar 24 04:54:03 2011
1000000 12605.8696080362 at buk.pl line 30, <> line 1000000.
Ended Thu Mar 24 04:55:22 2011

C:\_32\pscrpt>perl buk.pl -T=3 phrases.small >out.txt
Started Thu Mar 24 04:55:54 2011
1000000 12348.060968551 at buk.pl line 30, <> line 1000000.
Ended Thu Mar 24 04:57:15 2011

C:\_32\pscrpt>perl buk.pl -T=4 phrases.small >out.txt
Started Thu Mar 24 04:57:43 2011
1000000 12225.405921681 at buk.pl line 30, <> line 1000000.
Ended Thu Mar 24 04:59:05 2011

And, with 32-bit perl-5.10.something on linux: 
[rob@localhost pscrpt]$ /home/rob/perl510-multi/bin/perl buk.pl -T=1 p
+hrases.small >out.txt
Started Thu Mar 24 05:03:23 2011
1000000 8861.7641709435231 at buk.pl line 30, <> line 1000000.
Ended Thu Mar 24 05:05:23 2011
[rob@localhost pscrpt]$ /home/rob/perl510-multi/bin/perl buk.pl -T=2 p
+hrases.small >out.txt
Started Thu Mar 24 05:05:47 2011
1000000 5387.58673401599584 at buk.pl line 30, <> line 1000000.
Ended Thu Mar 24 05:08:53 2011
[rob@localhost pscrpt]$ /home/rob/perl510-multi/bin/perl buk.pl -T=3 p
+hrases.small >out.txt
Started Thu Mar 24 05:09:11 2011
1000000 4805.8109482304384 at buk.pl line 30, <> line 1000000.
Ended Thu Mar 24 05:12:40 2011
[rob@localhost pscrpt]$ /home/rob/perl510-multi/bin/perl buk.pl -T=4 p
+hrases.small >out.txt
Started Thu Mar 24 05:14:26 2011
1000000 4558.58825262797919 at buk.pl line 30, <> line 1000000.
Ended Thu Mar 24 05:18:05 2011