You're right. It is dependant on what version of Perl is used. I'm utterly confused now:

ActivePerl: 
d:\Web-Dev\arrays>perl -v

This is perl, v5.10.0 built for MSWin32-x86-multi-thread
(with 5 registered patches, see perl -V for more detail)

Copyright 1987-2007, Larry Wall

Binary build 1004 [287188] provided by ActiveState http://www.ActiveSt
+ate.com
Built Sep  3 2008 13:16:37

[snip]

D:\Web-Dev\arrays>perl test.pl
Records: 308273 in 5.641 seconds
Records: 279997 in 98.281 seconds
Records: 308273 in 128.656 seconds
Records: 279997 in 96.953 seconds
Records: 308273 in 129.188 seconds

[download]
Cygwin: 
bash-3.2$ /bin/perl -v

This is perl, v5.10.0 built for cygwin-thread-multi-64int
(with 6 registered patches, see perl -V for more detail)

Copyright 1987-2007, Larry Wall

[snip]

bash-3.2$ /bin/perl test.pl
Records: 308273 in 6.719 seconds
Records: 279997 in 5.875 seconds
Records: 308273 in 6.484 seconds
Records: 279997 in 5.906 seconds
Records: 308273 in 6.515 seconds

[download]

In reply to Re^2: Performance oddity when splitting a huge file into an AoA by Xenofur
in thread Performance oddity when splitting a huge file into an AoA by Xenofur

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