Your results are garbage.

1) The %HoH you pass as an argument is a global from some package (main?), not the my %HoH which is not visible to that code when its compiled by Benchmark. Instead of
Perl_Mouse => 'perl_mouse(\%HoH)',
use
Perl_Mouse => sub { perl_mouse(\%HoH) },
to avoid this problem.

2) The first call of the first function will remove the uncommon elements. For every subsequent call to that function and to the other functions, %HoH will only contains keys common to all hashes. You need to deeply copy %HoH before passing it to the functions.

Overall, I don't expect a major difference in speed between the different versions. Perl Mouse's will probably be the slowest (since it does all its looping in Perl, where as the others do it in C), but 1) it uses minimal memory, and more importantly, 2) it's the easiest to read. Using foreach values instead of while each will probably speed it up at the expense of memory.

In reply to Re^2: Common elements of a hash of hashes by ikegami
in thread Common elements of a hash of hashes by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.