I am trying to speed up an existing script by focusing on a loop that runs through individual files and returns values to an array and several hashes. I think this can be done using forks, but I'm not sure how to return the data from the children to the parent.

Reading the documentation it says you can only return one data structure, and to keep it small. Is it possible to return all of the values I've listed in the pseudo code below?

If so(assuming it's going to involve making one data structure containing references to all of these, how would you go about that, and then how would you dereference it once it's back to the parent? (I have struggled immensely with referencing/dereferencing!)

#pseudo code

use Parallel::ForkManager;

$threads = 20

my $pfm = new Parallel::ForkManager( $threads );

FOREACH: foreach my $thing(keys %{$things_hr}) {

    my $pid = $pfm->start and next;

#do stuff

        push @names, $name;
#do stuff

    $thing{$name}{a} = $value1;
    $thing{$name}{b} = $value2;

#do stuff

    $list{$id}{$name}{b} = $b;
    $list{$id}{$name}{e} = $b1;
    $list{$id}{$name}{a} = 0;
    $list{$id}{$name}{c} = $ar->[$id][3];
    $list{$id}{$name}{i} = $ar->[$id][1];
    $list{$id}{$name}{j} = $ar->[$id][2];
    $list{$id}{$name}{k} = sprintf("%.4f",$ar->[$id][9]);


$pfm->finish;
  

$pfm->wait_all_children;

[download]

In reply to Parallel::ForkManager and multiple datasets by Speed_Freak

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, 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.