Hi,

Don't look inside modules ;)

the problem is in your code, you're not closing filehandles for some reason

you report problems by posting the smallest possible program that REPRODUCES the bug

$ perl -fe " while(++$i){ open my($fh),'<',1 or last; push @f, $fh; } 
+ warn $i; require strict;"
2046 at -e line 1.
Can't locate strict.pm:   Too many open files at -e line 1.
[download]

As you can see the problem is not in require or Runtime.pm