Your test methodology seems broken to me.

  1. In the first script you are calling subroutines with_kets() and with_each() but they do not appear in the script?
  2. In the second script, if the keys test moves the process into swapping, then the each test will be equally affected.

And the output of GTop seems very muddled to me.

It is easy to verify that keys in a for loop creates a list of the keys (which there for consumes extra memory) by running this:

perl -E"my %h = 1..100; for my $k(keys %h){ undef %h; say scalar %h; s
+ay $k }"

[download]

It constructs a hash, enters a for loop using keys, and then undefs the hash and display its (zero) on the first (and every) iteration. The for loop iterates through all the keys despite that the hash has been emptied. Therefore a separate list of the keys must have been constructed.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^6: Finding the size of a nested hash in a HoH by BrowserUk
in thread Finding the size of a nested hash in a HoH by Jeri

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.