INTERESTING!
Maybe it doesn't hurt to program the way your brain really thinks...at least not this time. You see, I stripped down the MJD code to its barest form, exactly from the book. Then I removed the print statements from my own version which was just shared in the node previous to this node.
Surprise: despite the fact that I'm passing around a reference to my "$share" with each call, my code benches twice as fast. I'm betting it's because I'm not constantly recalculating the "$target".
Anyway, here's the benchmarks. I wonder what conclusions could be drawn. If I cared more, I'd run it through Devel::NYTprof and find out what's really going on and why it's faster to do it the way that makes the most sense to my dyslexic brain:
$ perl ./find_shares_myway_2.pl
Benchmark: timing 500000 iterations of test1...
test1: 16 wallclock secs (15.43 usr + 0.00 sys = 15.43 CPU) @ 32
+404.41/s (n=500000)
$VAR1 = {
'test1' => bless( [
16,
'15.43',
0,
0,
0,
500000
], 'Benchmark' )
};
$ perl ./find_shares.pl
Benchmark: timing 500000 iterations of test1...
test1: 31 wallclock secs (30.10 usr + 0.02 sys = 30.12 CPU) @ 16
+600.27/s (n=500000)
$VAR1 = {
'test1' => bless( [
31,
'30.1',
'0.02',
0,
0,
500000
], 'Benchmark' )
};
--
Tommy
$ perl -MMIME::Base64 -e 'print decode_base64 "YWNlQHRvbW15YnV0bGVyLm1lCg=="'
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.