Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl: the Markov chain saw
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
Maybe it's an even dirtier hack, but this one can speed up things a lot.
Your script saves time by skipping chomp. My addition will save time by avoiding a hidden join for each array interpolation. I found this trick when I was benchmarking anagram algorithms.
I used a 116_246 words dictionary, and I got a significative speed improvement, as you can see from the relative times.
$ wc words.english 116246 116246 989075 words.english $ time perl dict.pl words.english # first hack 1.38 user 0.05 system 0:01.43 elapsed $ time perl dict2.pl words.english # second hack 0.86 user 0.02 system 0:00.88 elapsed
Change
push @{$Word{length$_}},$_ while (<>); # ... print OUT @{$Word{$_}};
into
$Word{length$_} .= $_ while (<>); # ... print OUT $Word{$_};

BTW: ChOas, congratulations for your sanctification!

update
There is always room for improvement, though. ...
Combining the first array solution with the other tricks, we have a further 10% improvement.

#!/usr/bin/perl -w use strict; my @words; my $file; $words[length$_] .= $_ while (<>); for (0..$#words) { next unless $words[$_]; $file=$_-1 . ".mine"; open OUT,">$file" or die "Cannot open $file.mine: $!\n"; print OUT $words[$_]; close OUT; };
update (2)
I am afraid that I must have spoiled demerphq's comparison with my previous update. ;)
He very chivalrously included such update and compared the methods shown so far, offering an improvement, that was unfortunately slower than this array + concatenation hack.
Nice Job. Keep up the good work, bro, and many thanks for your analysis.
 _  _ _  _  
(_|| | |(_|><
 _|   

In reply to Re: (FASTER) Example of TMTOWTDI by gmax
in thread Extreme Example of TMTOWTDI by Cody Pendant

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • 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.
Log In?
Username:
Password:

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

How do I use this?Last hourOther CB clients
Other Users?
Others imbibing at the Monastery: (8)
As of 2024-03-28 12:20 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found