in reply to number of open files Perl can handle

You can find out your systems (OS) currently configured limit easily: 

>perl -le"my @a; open $a[ $_ ], '>', qq[file$_] or die qq[$!:$_] for 1
+ .. 10e3"
Too many open files : 2046 at -e line 1.

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In Section Seekers of Perl Wisdom