But if we're talking about a loop, this memory conservation only exists in the first iteration of it. 
while (1) {
   # during the first iteration, no variables have been
   # declared yet.
   # However, if we're in the 2nd, 3rd, etc loop..
   # that 3ish KB of memory allocated for $variable
   # still belong to Perl, and are most likely not yet
   # free()'ed

   sleep 10;

   # Create roughly 3 KB
   { my $variable = 'foo' x 1024; }
}

[download]

So you see... we conserve memory for an extra 10 seconds (the first 10 seconds of this code's execution)... but that's it. After that, Perl holds on to that memory created for $variable... even when $variable goes out of scope. So the position of the sleep really makes no real difference.

Anyway, these sorts of attempts at micro-optimizations usually prove to be futile, as Perl does a great job of it on its own. =)

In reply to Re: Re: Re: Re: writing looped programs by count0
in thread writing looped programs by tachekent

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.