Beefy Boxes and Bandwidth Generously Provided by pair Networks
Welcome to the Monastery
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
And here's the benchmark to prove it:
#!/usr/bin/perl -w use strict; use Benchmark; Benchmark::cmpthese(10_000, { 'C-style' => sub { for (my $i = 0; $i <= 1000; $i++){ undef } }, 'foreach' => sub { for my $i (0..1000) { undef } } }); __END__ Benchmark: timing 10000 iterations of C-style, foreach... C-style: 5 wallclock secs ( 5.20 usr + 0.00 sys = 5.20 CPU) @ 19 +23.08/s (n=10000) foreach: 4 wallclock secs ( 3.73 usr + 0.00 sys = 3.73 CPU) @ 26 +80.97/s (n=10000) Rate C-style foreach C-style 1923/s -- -28% foreach 2681/s 39% --

By the way: does perl have absolutely _no_ optimisation for for (;;) without any expressions in its parens? I find that a bit hard to believe.

2;0 juerd@ouranos:~$ perl -e'undef christmas' Segmentation fault 2;139 juerd@ouranos:~$


In reply to Re: Re: Re: do/redo or for(;;): what's Kosher? by Juerd
in thread do/redo or for(;;): what's Kosher? by rje

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!
  • 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, 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, 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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (6)
    As of 2015-07-29 06:03 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (260 votes), past polls