There is one single characteristic that is significantly improving your performance. The lack of ithreads support. From your print outs:

The "fast baby": 

Characteristics of this binary (from libperl):
  Compile-time options: MULTIPLICITY USE_LARGE_FILES PERL_IMPLICIT_CON
+TEXT

[download]

and the installed version: 

Characteristics of this binary (from libperl):
  Compile-time options: MULTIPLICITY USE_ITHREADS USE_LARGE_FILES PERL
+_IMPLICIT_CONTEXT

[download]

The gain from removing threads can vary between 10-40% in the tests we've done. However, you are not comparing like for like. The installed version is based on 5.8.0 and your fast version is based on 5.8.5.

Unfortunately RH, and probably several other distros, come with a threaded Perl. Even though when 5.8.0 was released, ithreads were not recommended for production environments. From what I understand, ithreads support is much more stable now.

--
Barbie | Birmingham Perl Mongers user group | http://birmingham.pm.org/

In reply to The magic of threads by barbie
in thread How to make your Perl 30% faster by PetaMem

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.