Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
They seem to be about the same. shift comes out slightly ahead in this test, perhaps because it simplifies the loop.
#!/usr/bin/perl use warnings; use strict; use Benchmark; timethese(1_000_000, { 'use_shift' => sub { sub_with_shift(0..9) }, 'use_list' => sub { sub_with_list(0..9) }, 'use_direct' => sub { sub_with_direct(0..9) }, }); sub sub_with_shift { my $sum = 0; while (@_) { $sum += shift; } $sum; } sub sub_with_list { my(@a)=@_; my $sum = 0; $sum += $_ for @a; $sum; } sub sub_with_direct { my $sum = 0; $sum += $_ for @_; $sum; }
Benchmark: timing 1000000 iterations of use_direct, use_list, use_shift...
use_direct:  7 wallclock secs ( 6.48 usr + -0.01 sys =  6.47 CPU) @ 154559.51/s (n=1000000)
  use_list: 10 wallclock secs ( 9.85 usr +  0.06 sys =  9.91 CPU) @ 100908.17/s (n=1000000)
 use_shift:  6 wallclock secs ( 6.48 usr +  0.01 sys =  6.49 CPU) @ 154083.20/s (n=1000000)

In reply to Re^3: shift vs @_ by sgifford
in thread shift vs @_ by Zadeh

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 chilling in the Monastery: (10)
    As of 2015-07-08 00:47 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 (93 votes), past polls