ITYM
@one   = (('a') x 100);
@two   = (('a') x 1000);
@three = (('a') x 10000);

[download]
As it is written each array has one element 100, 1000, or 10000 characters long rather than having 100, 1000, or 10000 elements one character long. With this change (and changing it to run 10,000 times) I get:
Benchmark: timing 10000 iterations of rev 100, rev 1000, rev 10000...
   rev 100:  0 wallclock secs ( 0.54 usr + -0.01 sys =  0.53 CPU) @ 18
+867.92/s (n=10000)
  rev 1000:  4 wallclock secs ( 5.52 usr + -0.01 sys =  5.51 CPU) @ 18
+14.88/s (n=10000)
 rev 10000: 59 wallclock secs (58.33 usr + -0.00 sys = 58.33 CPU) @ 17
+1.44/s (n=10000)

[download]

In reply to Re: Re: How expensive is reverse? by nardo
in thread How expensive is reverse? by bless$self=>perlmonks;

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.