Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

I have and it's not. Or, at least, it's not faster. But it's also more general purpose.

my $op = '+'; my $add_5_things = arbitrary_operator_maker($op, 5); my @list_5 = (1..5); timethese(1000000, { 'add_5_things elements cached' => sub { $add_5_things->(@list_5); }, 'add_5_things elements dispatched' => sub { my $add_5_things = arbitrary_operator_maker($op, 5); $add_5_things->(@list_5); }, 'multi_add 5 elements' => sub { multi_add(@list_5); }, 'reduce' => sub { reduce { $a + $b} @list_5; } }); Benchmark: timing 1000000 iterations of add_5_things elements cached, +add_5_things elements dispatched, multi_add 5 elements, reduce... add_5_things elements cached: 0 wallclock secs ( 0.99 usr + 0.00 sys + = 0.99 CPU) @ 1010101.01/s (n=1000000) add_5_things elements dispatched: 2 wallclock secs ( 2.94 usr + -0.00 + sys = 2.94 CPU) @ 340136.05/s (n=1000000) multi_add 5 elements: 2 wallclock secs ( 2.52 usr + 0.01 sys = 2.53 + CPU) @ 395256.92/s (n=1000000) reduce: 4 wallclock secs ( 3.24 usr + 0.01 sys = 3.25 CPU) @ 30 +7692.31/s (n=1000000)

Or, with a bigger set:

my $op = '+'; my $add_500_things = arbitrary_operator_maker($op, 500); my @list_500 = (1..500); timethese(10000, { 'add_500_things elements cached' => sub { $add_500_things->(@list_500); }, 'add_500_things elements dispatched' => sub { my $add_500_things = arbitrary_operator_maker($op, 500); $add_500_things->(@list_500); }, 'multi_add 5 elements' => sub { multi_add(@list_500); }, 'reduce' => sub { reduce { $a + $b} @list_500; } }); Benchmark: timing 10000 iterations of add_500_things elements cached, +add_500_things elements dispatched, multi_add 5 elements, reduce... add_500_things elements cached: 1 wallclock secs ( 0.72 usr + 0.00 s +ys = 0.72 CPU) @ 13888.89/s (n=10000) add_500_things elements dispatched: 0 wallclock secs ( 0.74 usr + 0. +00 sys = 0.74 CPU) @ 13513.51/s (n=10000) multi_add 5 elements: 0 wallclock secs ( 1.03 usr + 0.00 sys = 1.03 + CPU) @ 9708.74/s (n=10000) reduce: 1 wallclock secs ( 1.18 usr + 0.00 sys = 1.18 CPU) @ 84 +74.58/s (n=10000)

Of course, it's also much more general purpose than the arbitrary_operator_maker is, which is highly specialized. But for these tests, though, reduce was the slowest of the bunch. Benchmarks are your friend.


In reply to Re^2: The arbitrary operator maker by jimt
in thread The arbitrary operator maker by jimt

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
  • Outside of code tags, you may need to use entities for some characters:
            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 surveying the Monastery: (13)
    As of 2014-07-11 13:13 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      When choosing user names for websites, I prefer to use:








      Results (224 votes), past polls