> It would be interesting to know how and when this reallocation happens and if it's automatically done on C-level

I suggest you study your good friend ikegami's excellent Mini-Tutorial: Perl's Memory Management ... which concludes with:

You can't rely on memory being returned to the system, but it can happen ... if and when memory is returned to the OS is dependant on the memory allocation mechanism perl was compiled to use ... you are more likely to see memory being released to the OS on Windows

See also: Returning Memory back to the OS References 

👁️🍾👍🦟

In reply to Re^5: How to implement a Queue that doesn't leak memory? by eyepopslikeamosquito
in thread How to implement a Queue that doesn't leak memory? 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.